RESTORE STRENGTH
AND VITALITY

Guided by science, Testosterone Support delivers nature’s solutions to restoring your vigor and taking back control of your life so you can once again be the hero of your day (and your night).

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Harness greater energy and motivation to perform at your peak.

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Gain physical resilience to build muscle and burn body fat.

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Restore confidence with better sleep, a sharper mind, and a brighter mood.

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Based on 37 reviews
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Third-Party Tested for Purity and Accuracy

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Made in the USA

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Manufactured in a GMP-certified facility

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Manufactured in FDA Approved Facilities

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Thrilled or your money back

PACKED WITH INGREDIENTS PROVEN
TO MAKE LOW-T A THING OF THE PAST

Meet some of the thousands of men who already discovered it.

Christian B.
Christian B.
“I've been in this industry for 16 years and have seen it all, and for me, Innerbody Labs really stands out above the rest thanks to their meticulous, obsessive attention to detail when it comes to creating premium, effective supplements designed to actually help people.”
Jon P.
Jon P.
“Great product -- I was dealing with crashes on the daily, just wiped out and couldn't power through it, and didn't have the energy to work out the way I wanted, either. This started a couple of years ago, almost like clockwork when I turned 30. At that point, I was like, give me a break -- is it all in my head? I think embarrassment kept me from doing anything for a while, but after a year or so, I knew it wasn't in my head, it was very real. And it was all taking a toll. Tried other products but nothing worked, until this. I'm restored and couldn't be more thrilled.”
Bruce D.
Bruce D.
“Well I know I'm NOT 10 years younger, but that's how I feel. Until somebody invents a time machine, this is the next best thing that I've found! I've done nothing different but am seeing and enjoying more of it. This stuff is the real deal. Getting my muscles back, getting trimmer, and getting more of the elevator eye if you know what I mean.... I have energy for work and play all hours of the day.”

There’s a new way to reverse the clock

Many men struggle silently with low energy, fatigue, and brain fog, thinking it's just a part of aging. If that sounds familiar, you may be battling low testosterone.

You could just let it go, gradually notice your libido and sexual performance falter. Day after day, you could struggle to make gains at the gym, even as gaining body fat gets easier and easier. The vitality, physique, and wit that filled you with pride as a young man can fade before your eyes, leaving you increasingly irritable and depressed.

Or you could do something about it.

Goal

Low-T is very common

It affects millions of men — especially as they enter their 30s and 40s, when T levels plummet by at least 1% every single year.

But it doesn't have to be this way. Innerbody Labs has created a supplement with 11 ingredients that work together — vitamins, minerals, and botanical extracts that are clinically proven to increase your testosterone levels dramatically and safely.

One dose each morning is all it takes to increase your T levels by more than 100% within a couple months, restoring your physique, vitality, and mental acuity. You’ll notice the difference — and others will, too.

Don’t believe us?

We can’t blame you, with all of the snake oil and false promises bombarding you left and right.

But we formulated this supplement like no other company has, guided by what human studies have proven effective. We’re so confident that you’ll love it, we’re offering all new customers a full money-back guarantee.

Try it out for yourself, and if you don’t feel the transformative effects, we’ll refund your money — no questions asked.

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Happy Customer

Discover what happens when Innerbody Labs more than doubles your free testosterone…

Supercharge energy levels by 200%

Our ingredients increase the rate of muscle glycogen resynthesis after exercise, translating to faster recovery to get you back in the gym faster.

Improve recovery rate by 63%

Testosterone Support’s ingredients can improve maximum strength output in leg press, bench press, and more, allowing you to push and pull more weight for bigger gains.

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Increase maximum strength by 54%

Testosterone Support can increase VO2max (maximal oxygen consumption capacity), fueling your muscles to work harder for longer and dramatically increasing energy levels.

Decrease stress levels by 175%

Ashwagandha and other ingredients in Testosterone Support can dramatically reduce cortisol levels and self-reported anxiety scores.

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NO PRESCRIPTION REQUIRED      CLINICALLY BACKED DOSAGES      REAL RESULTS WITH DAILY USE      NON-GMO      GLUTEN-FREE      VEGETARIAN      PALEO & KETO FRIENDLY   
NO PRESCRIPTION REQUIRED      CLINICALLY BACKED DOSAGES      REAL RESULTS WITH DAILY USE      NON-GMO      GLUTEN-FREE      VEGETARIAN      PALEO & KETO FRIENDLY   
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Compared to Innerbody Labs Testosterone Support,

No other formula stacks up

Innerbody Labs

Other Brands

Only includes ingredients with benefits proven in clinical trials
Includes ingredients with little or no research on men, or mixed research suggesting potential health risks
Uses ingredient doses that match or safely exceed those that proved effective
Uses ingredients at unreliably low doses, very likely undermining their effectiveness
Produces dramatic results without prescriptions, doubling free testosterone and directly addressing symptoms of low-T
Passes unnecessary costs along to you because they include a laundry list of questionable, overhyped ingredients
Adds copper alongside zinc to keep you safe from copper depletion
Often includes zinc but skips the copper, leaving you more at risk of copper depletion
Non-GMO, gluten-free, vegetarian-friendly, paleo- and keto-friendly, made in an FDA cGMP certified facility in the USA, quality-tested redundantly in a third-party lab.
Often manufactures overseas and contains irritating additives
Alongside proven T-boosting ingredients, contains ingredients that support male fertility and the body's natural testosterone production at cellular and genetic levels.
Only rarely tests independently for quality and purity in a third-party lab — especially worrisome when they include ingredients like shilajit, which elevates your risk of heavy metals exposure
Protects you with a 30-day, no-questions-asked moneyback guarantee
May offer no return policy, or a next-to-useless policy that only accepts returns on unopened product
testoPrime
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30 Day Guarantee Badge Testosterone Bottles

All orders protected by our 30-day, no-questions-asked moneyback guarantee

We’re so confident in the effectiveness of our supplement that we offer every customer a 30-day, 100% money-back guarantee on their order of any quantity. No questions asked!

How can we even afford to do this? It's actually easy: we follow the science. We've spent thousands of hours researching and testing T-boosting ingredients and have invested hundreds of thousands of dollars in our formula. We test it repeatedly to ensure potency and purity. Our ingredients align with clinical studies that prove effectiveness and safety for men. Simply put, no other supplement achieves the potent, synergistic combination of ingredients that we deliver in every dose.

But no product works for every single person.

If you're one of the 2% who end up dissatisfied with the positive effects of increasing testosterone, all you have to do is start your return via our website within 30 days of receiving your shipment. Just mail the container/s (opened or unopened) back to us along with your order number, and we'll refund your original purchase amount in full. You've got nothing to lose but so much to gain.

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“Why is Innerbody Labs my best choice?”

And other frequently asked questions

Why is Innerbody Labs my best choice for testosterone support?

We know there are other options, but none can compare to our formula. 

When we set out to formulate our own testosterone booster, we already had the advantage of years spent scrutinizing other options on the market.

• We’d spent countless hours poring over the latest scientific research into testosterone production and male hormone balance, as well as the hundreds of studies looking into individual ingredients that companies use to improve testosterone levels.

• We’ve consulted with formulation experts to gain unique insights into manufacturing techniques, as well as urologists who could speak more directly to the average patient’s experience than a scientific study might.

Too often, we saw products on the market that contained promising, well-researched ingredients but in quantities too low to achieve reliable results. Sometimes we saw formulas that relied on ingredients sorely lacking research on actual men. (Animal studies are useful, but they’re no replacement for clinical trials.)

So we carefully followed the science, focusing on the substances — vitamin, mineral, botanical — that numerous research studies show to be effective and safe for increasing testosterone levels and addressing the symptoms of low T. The end result? Innerbody Labs Testosterone Support delivers more effective ingredients than the competition, doing so at doses that meet or exceed those used in successful scientific research.

Testosterone Support from Innerbody Labs can better help men retain muscle mass, strengthen libido, manage stress, and prevent declines in mood and energy.

How soon can I expect to see results?

Some may begin to notice results within the first week of use, while others will notice results several weeks or months later.

The ingredients within Testosterone Support improve testosterone levels and target the symptoms of low testosterone in different ways. Given this diversity of ingredients we’ve included, you could feel an increase in libido within days, though the full effects of the supplement and its impact on measurable testosterone levels will likely take closer to 12 weeks to arrive at their peak. After that, consistent use can maintain those positive results.

What is testosterone, and why is it important?

Testosterone is the primary male sex hormone and plays a role in the hormonal health of women as well. It’s responsible for the fetal development of male sex organs and the masculinizing effects of puberty, like a deepening voice, increased body hair, and the onset of fertility.

In adulthood, testosterone also regulates libido and sperm production, but its role extends far beyond sexual health or masculinity. It can control the balance between muscle and fat throughout the body while also ensuring sufficient bone strength as you age. Testosterone levels affect mood and energy levels and even influence the production of red blood cells.

Testosterone levels decline naturally as you age, with the most significant dropoff period beginning at around 40, after which you can lose up to 1% of your testosterone production every year.

Do you ship internationally?

At this time, no, we only ship to customers in the United States. If you are located outside the United States, we encourage you to learn about other top supplements that we recommend in our guide to testosterone boosters (such as supplements made by TestoPrime and Roman).

Do you deliver to Army post office addresses?

Yes, we do.

When is the best time of day to take Testosterone Support?

You can take Testosterone Support whenever it’s convenient for you within a given day. The ingredients aren’t intended to have instant effects, but men interested in maintaining the highest possible T levels might consider taking it in the morning. Testosterone levels are at their highest after you wake up, and they decline throughout the day, hitting their low in the evening. Taking your Testosterone Support dose with breakfast may influence that daily decline.

How many capsules do I need to take per day?

The suggested daily serving of Innerbody Testosterone Support is four (4) capsules per day.

Can I take Innerbody Testosterone Support with other supplements and medications?

While we formulated our supplement with safety in mind, as with any supplement, you should speak with your doctor before adding this supplement to your routine. This will ensure that the supplement is safe for you, specifically, based on your underlying health and any medications you are currently taking.

Do I need to cycle Innerbody Testosterone Support?

No, you do not need to cycle Innerbody Testosterone Support. None of our ingredients have shown evidence of accumulated tolerance or toxicity with long-term use.

Why is copper included in this supplement?

We’ve included copper in our supplement because we’ve also included zinc. Zinc has been shown to influence testosterone levels significantly. Copper hasn’t shown such influence, but research indicates that zinc supplementation can lead to copper deficiency, and we take great pains to ensure our product is as safe as it is effective.

How long will my order take to arrive?

Shipping times do vary, but orders typically arrive on an average of 3-4 business days.

Can women take Innerbody Testosterone Support?

Innerbody Testosterone Support is intended for adult males. Women should consult with a physician before taking Innerbody Testosterone Support. We formulated this supplement specifically to support men’s testosterone levels, though there could be medical occasions where its ingredients could be recommendable to a woman, however rare those may be.

Have other questions? Reach out!

You can reach us at support@innerbody.com.

Transparent ingredients supported by clinical studies

1Wankhede, S., Mohan, V., & Thakurdesai, P. (2016). Beneficial effects of fenugreek glycoside supplementation in male subjects during resistance training: A randomized controlled pilot study. Journal of Sport and Health Science, 5(2), 176-182.
2Taylor, L., Poole, C., Pena, E., Lewing, M., Kreider, R., Foster, C., & Wilborn, C. (2011). Effects of Combined Creatine Plus Fenugreek Extract vs. Creatine Plus Carbohydrate Supplementation on Resistance Training Adaptations. Journal of Sports Science & Medicine, 10(2), 254-260.
3Poole, C., Bushey, B., Foster, C., Campbell, B., Willoughby, D., Kreider, R., Taylor, L., & Wilborn, C. (2010). The effects of a commercially available botanical supplement on strength, body composition, power output, and hormonal profiles in resistance-trained males. Journal of the International Society of Sports Nutrition, 7, 34.
4Goh, J., Menke, W., Herrick, L. P., Campbell, M. S., Abel, M. G., Fleenor, B. S., & Bergstrom, H. C. (2020). Examination of Curcumin and Fenugreek Soluble Fiber Supplementation on Submaximal and Maximal Aerobic Performance Indices. Journal of Functional Morphology and Kinesiology, 5(2).
5Ruby, B. C., Gaskill, S. E., Slivka, D., & Harger, S. G. (2005). The addition of fenugreek extract (Trigonella foenum-graecum) to glucose feeding increases muscle glycogen resynthesis after exercise. Amino Acids, 28(1), 71–76.
6Slivka, D., Cuddy, J., Hailes, W., Harger, S., & Ruby, B. (2008). Glycogen resynthesis and exercise performance with the addition of fenugreek extract (4-hydroxyisoleucine) to post-exercise carbohydrate feeding. Amino Acids, 35(2), 439–444.
7Hassani, S. S., Arezodar, F. F., Esmaeili, S. S., & Gholami-Fesharaki, M. (2019). Effect of Fenugreek Use on Fasting Blood Glucose, Glycosylated Hemoglobin, Body Mass Index, Waist Circumference, Blood Pressure and Quality of Life in Patients with Type 2 Diabetes Mellitus: A Randomized, Double-Blinded, Placebo-Controlled Clinical Trials. Galen Medical Journal, 8, e1432.
8Kiss, R., Szabó, K., Gesztelyi, R., Somodi, S., Kovács, P., Szabó, Z., Németh, J., Priksz, D., Kurucz, A., Juhász, B., & Szilvássy, Z. (2018). Insulin-Sensitizer Effects of Fenugreek Seeds in Parallel with Changes in Plasma MCH Levels in Healthy Volunteers. International Journal of Molecular Sciences, 19(3).
9Lopresti, A. L., Drummond, P. D., & Smith, S. J. (2019). A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha (Withania somnifera) in Aging, Overweight Males. American Journal of Men's Health.
10Chauhan, S., Srivastava, M. K., & Pathak, A. K. (2022). Effect of standardized root extract of ashwagandha (Withania somnifera) on well-being and sexual performance in adult males: A randomized controlled trial. _Health Science Reports, 5_(4).
11Verma, N., Gupta, S. K., Tiwari, S., Mishra, A. K., Thakare, V., & Patil, S. (2023). Effect of Ashwagandha Root Extract on Serum Testosterone and Muscle Recovery in Strength Training. ​International Journal of Medical and Pharmaceutical Research, 4(5), 371-381.
12Gaddam, A., Galla, C., Thummisetti, S., Marikanty, R. K., Palanisamy, U. D., & Rao, P. V. (2015). Role of Fenugreek in the prevention of type 2 diabetes mellitus in prediabetes. Journal of Diabetes and Metabolic Disorders, 14.
13Guo, R., Wang, Q., Nair, R.P., Barnes, S.L., Smith, D.T., Dai, B., Robinson, T.J., & Nair, S. (2018). Furosap, a novel Fenugreek seed extract improves lean body mass and serum testosterone in a randomized, placebo-controlled, double-blind clinical investigation. Functional Foods in Health and Disease. 7(4)
14Bagchi, D., Swaroop, A., Maheshwari, A., Verma, N., Tiwari, K.B., Bagchi, M., Preuss, H.G., & Kumar, P. (2017). A novel protodioscin-enriched fenugreek seed extract (Trigonella foenum-graecum, family Fabaceae) improves free testosterone level and sperm profile in healthy volunteers. Functional Foods in Health and Disease, 7, 235-245.
15G, S., G L, S., Pushpan, C. K., Nambisan, B., & A, H. (2018). Evaluation of anti-arthritic potential of Trigonella foenum graecum L. (Fenugreek) mucilage against rheumatoid arthritis. Prostaglandins & Other Lipid Mediators, 138, 48–53.
16Pundarikakshudu, K., Shah, D. H., Panchal, A. H., & Bhavsar, G. C. (2016). Anti-inflammatory activity of fenugreek (Trigonella foenum-graecum Linn) seed petroleum ether extract. Indian Journal of Pharmacology, 48(4), 441-444.
17Ziegenfuss, T. N., Kedia, A. W., Sandrock, J. E., Raub, B. J., Kerksick, C. M., & Lopez, H. L. (2018). Effects of an Aqueous Extract of Withania somnifera on Strength Training Adaptations and Recovery: The STAR Trial. Nutrients, 10(11), 1807.
18Wankhede, S., Langade, D., Joshi, K., Sinha, S. R., & Bhattacharyya, S. (2015). Examining the effect of Withania somnifera supplementation on muscle strength and recovery: A randomized controlled trial. Journal of the International Society of Sports Nutrition, 12.
19Lopresti, A. L., Smith, S. J., Malvi, H., & Kodgule, R. (2019). An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: A randomized, double-blind, placebo-controlled study. Medicine, 98(37).
20Ahmad, M. K., Mahdi, A. A., Shukla, K. K., Islam, N., Rajender, S., Madhukar, D., Shankhwar, S. N., & Ahmad, S. (2010). Withania somnifera improves semen quality by regulating reproductive hormone levels and oxidative stress in seminal plasma of infertile males. Fertility and Sterility, 94(3), 989-996.
21Gupta, A., Mahdi, A. A., Shukla, K. K., Ahmad, M. K., Bansal, N., Sankhwar, P., & Sankhwar, S. N. (2013). Efficacy of Withania somnifera on seminal plasma metabolites of infertile males: A proton NMR study at 800 MHz. Journal of Ethnopharmacology, 149(1), 208-214.
22Andrade, C., Aswath, A., Chaturvedi, S. K., Srinivasa, M., & Raguram, R. (2000). A double-blind, placebo-controlled evaluation of the anxiolytic efficacy of an ethanolic extract of Withania somnifera. Indian Journal of Psychiatry, 42(3), 295-301.
23Sud, K. S., & Thaker, A.​ B. (2013). A Randomized Double Blind Placebo Controlled Study of Ashwagandha on Generalized Anxiety Disorder.​ International Ayurvedic Medical Journal, 1(5)
24Sandhu, J. S., Shah, B., Shenoy, S., Chauhan, S., Lavekar, G. S., & Padhi, M. M. (2010). Effects of Withania somnifera (Ashwagandha) and Terminalia arjuna (Arjuna) on physical performance and cardiorespiratory endurance in healthy young adults. International Journal of Ayurveda Research, 1(3), 144-149.
25Shenoy, S., Chaskar, U., Sandhu, J. S., & Paadhi, M. M. (2012). Effects of eight-week supplementation of Ashwagandha on cardiorespiratory endurance in elite Indian cyclists. Journal of Ayurveda and Integrative Medicine, 3(4), 209-214.
26Malik, A., Mehta, V., Dahiya, V. (2013). Effect of Ashwagandha (Withania somnifera) Root Powder on the VO2 Max and Hemoglobin in Hockey Players. International Journal of Behavioral Social and Movement Sciences, 2(3).
27Choudhary, B., Shetty, A., & Langade, D. G. (2015). Efficacy of Ashwagandha (Withania somnifera [L.] Dunal) in improving cardiorespiratory endurance in healthy athletic adults. Ayu, 36(1), 63-68.
28RK, T., BA, S., AU, P., AA, R., & NN, R. (2016). Effect of Withania somnifera on physical and cardiovascular performance induced by physical stress in healthy human volunteers. International Journal of Basic & Clinical Pharmacology, 5(6), 2510–2516.
29Deshpande, A., Irani, N., Balkrishnan, R., & Benny, I. R. (2020). A randomized, double blind, placebo controlled study to evaluate the effects of ashwagandha (Withania somnifera) extract on sleep quality in healthy adults. Sleep medicine, 72, 28–36.
30Langade, D., Kanchi, S., Salve, J., Debnath, K., & Ambegaokar, D. (2019). Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-controlled Study. Cureus, 11(9).
31Choudhary, D., Bhattacharyya, S., & Joshi, K. (2016). Body Weight Management in Adults Under Chronic Stress Through Treatment With Ashwagandha Root Extract. Journal of Evidence-Based Complementary & Alternative Medicine.
32Kelgane, S. B., Salve, J., Sampara, P., & Debnath, K. (2020). Efficacy and Tolerability of Ashwagandha Root Extract in the Elderly for Improvement of General Well-being and Sleep: A Prospective, Randomized, Double-blind, Placebo-controlled Study. Cureus, 12(2).
33Pingali, U., Pilli, R., & Fatima, N. (2014). Effect of standardized aqueous extract of Withania somnifera on tests of cognitive and psychomotor performance in healthy human participants. Pharmacognosy Research, 6(1), 12-18.
34Wehr, E., Pilz, S., Boehm, B. O., März, W., & Obermayer-Pietsch, B. (2010). Association of vitamin D status with serum androgen levels in men. Clinical Endocrinology, 73(2), 243-248.
35Lee, D. M., Tajar, A., Pye, S. R., Boonen, S., Vanderschueren, D., Bouillon, R., W, T., Bartfai, G., Casanueva, F. F., Finn, J. D., Forti, G., Giwercman, A., Han, T. S., Huhtaniemi, I. T., Kula, K., Lean, M. E., Pendleton, N., Punab, M., & Wu, F. C. (2012). Association of hypogonadism with vitamin D status: The European Male Ageing Study. European Journal of Endocrinology, 166(1), 77-85.
36Nimptsch, K., Platz, E. A., Willett, W. C., & Giovannucci, E. (2012). Association between plasma 25-OH vitamin D and testosterone levels in men. Clinical Endocrinology, 77(1), 106-112.
37Chin, K. Y., Ima-Nirwana, S., & Wan Ngah, W. Z. (2015). Vitamin D is significantly associated with total testosterone and sex hormone-binding globulin in Malaysian men. The Aging Male : The Official Journal of the International Society for the Study of the Aging Male, 18(3), 175–179.
38Laczmanski, L., Lwow, F., Mossakowska, M., Puzianowska-Kuznicka, M., Szwed, M., Kolackov, K., Krzyzanowska-Swiniarska, B., Bar-Andziak, E., Chudek, J., Sloka, N., & Milewicz, A. (2015). Association between vitamin D concentration and levels of sex hormones in an elderly Polish population with different genotypes of VDR polymorphisms (rs10735810, rs1544410, rs7975232, rs731236). Gene, 559(1), 73–76.
39Tak, Y. J., Lee, J. G., Kim, Y. J., Park, N. C., Kim, S. S., Lee, S., Cho, B. M., Kong, E. H., Jung, D. W., & Yi, Y. H. (2015). Serum 25-hydroxyvitamin D levels and testosterone deficiency in middle-aged Korean men: A cross-sectional study. Asian Journal of Andrology, 17(2), 324-328.
40Wang, N., Han, B., Li, Q., Chen, Y., Chen, Y., Xia, F., Lin, D., Jensen, M. D., & Lu, Y. (2015). Vitamin D is associated with testosterone and hypogonadism in Chinese men: Results from a cross-sectional SPECT-China study. Reproductive Biology and Endocrinology : RB&E, 13.
41Anic, G. M., Albanes, D., Rohrmann, S., Kanarek, N., Nelson, W. G., Bradwin, G., Rifai, N., McGlynn, K. A., Platz, E. A., & Mondul, A. M. (2016). Association between serum 25-hydroxyvitamin D and serum sex steroid hormones among men in NHANES. Clinical Endocrinology, 85(2), 258-266.
42Rafiq, R., van Schoor, N. M., Sohl, E., Zillikens, M. C., Oosterwerff, M. M., Schaap, L., Lips, P., & de Jongh, R. T. (2016). Associations of vitamin D status and vitamin D-related polymorphisms with sex hormones in older men. The Journal of Steroid Biochemistry and Molecular Biology, 164, 11–17.
43Tirabassi, G., Sudano, M., Salvio, G., Cutini, M., Muscogiuri, G., Corona, G., & Balercia, G. (2018). Vitamin D and Male Sexual Function: A Transversal and Longitudinal Study. International Journal of Endocrinology, 2018(1), 3720813.
44Pilz, S., Frisch, S., Koertke, H., Kuhn, J., Dreier, J., Obermayer-Pietsch, B., Wehr, E., & Zittermann, A. (2011). Effect of vitamin D supplementation on testosterone levels in men. Hormone and Metabolic Research, 43(3), 223–225.
45M. Tambi, I. B., Imran, M. K., & Henkel, R. R. (2011). Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia, 44, 226-230.
46Henkel, R. R., Wang, R., Bassett, S. H., Chen, T., Liu, N., Zhu, Y., & Tambi, M. I. (2014). Tongkat Ali as a Potential Herbal Supplement for Physically Active Male and Female Seniors—A Pilot Study. Phytotherapy Research, 28(4), 544-550.
47Talbott, S. M., Talbott, J. A., George, A., & Pugh, M. (2013). Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. Journal of the International Society of Sports Nutrition, 10, 28.
48Hamzah, S.H. & Yusof, A. (2003). The Ergogenic Effect of Eurycoma longifolia Jack: A Pilot Study. Joint Conference of BASEMand BASES, 37, 464-470
49Leitão, A. E., Vieira, M. C. S., Pelegrini, A., da Silva, E. L., & Guimarães, A. C. A. (2021). A 6-month, double-blind, placebo-controlled, randomized trial to evaluate the effect of Eurycoma longifolia (Tongkat Ali) and concurrent training on erectile function and testosterone levels in androgen deficiency of aging males (ADAM). Maturitas, 145, 78–85.
50Kotirum, S., Ismail, S. B., & Chaiyakunapruk, N. (2015). Efficacy of Tongkat Ali (Eurycoma longifolia) on erectile function improvement: Systematic review and meta-analysis of randomized controlled trials. Complementary Therapies in Medicine, 23(5), 693-698.
51Ismail, S. B., Zahiruddin Wan Mohammad, W. M., George, A., Nik Hussain, N. H., Musthapa Kamal, Z. M., & Liske, E. (2012). Randomized Clinical Trial on the Use of PHYSTA Freeze-Dried Water Extract of Eurycoma longifolia for the Improvement of Quality of Life and Sexual Well-Being in Men. Evidence-Based Complementary and Alternative Medicine : ECAM, 2012.
52Chinnappan, S. M., George, A., Pandey, P., Narke, G., & Choudhary, Y. K. (2021). Effect of Eurycoma longifolia standardised aqueous root extract–Physta® on testosterone levels and quality of life in ageing male subjects: A randomised, double-blind, placebo-controlled multicentre study. Food & Nutrition Research, 65.
53Chan, K. Q., Stewart, C., Chester, N., Hamzah, S. H., & Yusof, A. (2021). The effect of Eurycoma Longifolia on the regulation of reproductive hormones in young males. Andrologia, 53(4), e14001.
54Gonzales, G. F., Cordova, A., Gonzales, C., Chung, A., Vega, K., & Villena, A. (2001). Lepidium meyenii (Maca) improved semen parameters in adult men. Asian journal of andrology, 3(4), 301–303.
55Gonzales, G. F., Córdova, A., Vega, K., Chung, A., Villena, A., Góñez, C., & Castillo, S. (2002). Effect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men. Andrologia, 34(6), 367–372.
56Stone, M., Ibarra, A., Roller, M., Zangara, A., & Stevenson, E. (2009). A pilot investigation into the effect of maca supplementation on physical activity and sexual desire in sportsmen. Journal of Ethnopharmacology, 126(3), 574–576.
57Zenico, T., Cicero, A. F., Valmorri, L., Mercuriali, M., & Bercovich, E. (2009). Subjective effects of Lepidium meyenii (Maca) extract on well-being and sexual performances in patients with mild erectile dysfunction: a randomised, double-blind clinical trial. Andrologia, 41(2), 95–99.
58Shin, D., Jeon, S. H., Piao, J., Park, H. J., Tian, W. J., Moon, D. G., Ahn, S. T., Jeon, H., Zhu, G. Q., Park, I., Park, J., Bae, W. J., Cho, H. J., Hong, H., & Kim, S. W. (2023). Efficacy and Safety of Maca (Lepidium meyenii) in Patients with Symptoms of Late-Onset Hypogonadism: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial. The World Journal of Men's Health, 41(3), 692-700.
59Gonzales, C., Rubio, J., Gasco, M., Nieto, J., Yucra, S., & Gonzales, G. F. (2006). Effect of short-term and long-term treatments with three ecotypes of Lepidium meyenii (MACA) on spermatogenesis in rats. Journal of Ethnopharmacology, 103(3), 448-454.
60Zheng, B. L., He, K., Kim, C. H., Rogers, L., Shao, Y., Huang, Z. Y., Lu, Y., Yan, S. J., Qien, L. C., & Zheng, Q. Y. (2000). Effect of a lipidic extract from lepidium meyenii on sexual behavior in mice and rats. Urology, 55(4), 598–602.
61Cicero, A. F., Bandieri, E., & Arletti, R. (2001). Lepidium meyenii Walp. improves sexual behaviour in male rats independently from its action on spontaneous locomotor activity. Journal of Ethnopharmacology, 75(2-3), 225–229.
62Yoshida, K., Ohta, Y., Kawate, N., Takahashi, M., Inaba, T., Hatoya, S., Morii, H., Takahashi, K., Ito, M., & Tamada, H. (2018). Long-term feeding of hydroalcoholic extract powder of Lepidium meyenii (maca) enhances the steroidogenic ability of Leydig cells to alleviate its decline with ageing in male rats. Andrologia, 50(1), 10.1111/and.12803.
63Hunt, C. D., Johnson, P. E., Herbel, J., & Mullen, L. K. (1992). Effects of dietary zinc depletion on seminal volume and zinc loss, serum testosterone concentrations, and sperm morphology in young men. The American journal of clinical nutrition, 56(1), 148–157.
64Prasad, A. S., Abbasi, A. A., Rabbani, P., & Dumouchelle, E. (1981). Effect of zinc supplementation on serum testosterone level in adult male sickle cell anemia subjects. American Journal of Hematology, 10(2), 119-127.
65Liu, L., Zhang, N., Tong, Y., Sun, Y., Zhu, H., Cao, Y., Zhang, J., Huang, H., Niu, B., Li, H., Guo, H., Gao, Y., Zhu, L., & Li, Y. (2017). The effectiveness of zinc supplementation in men with isolated hypogonadotropic hypogonadism. Asian Journal of Andrology, 19(3), 280-285.
66Chu, D. S. (2018). Zinc: A small molecule with a big impact on sperm function. PLoS Biology, 16(6).
67Fallah, A., Mohammad-Hasani, A., & Colagar, A. H. (2018). Zinc is an Essential Element for Male Fertility: A Review of Zn Roles in Men’s Health, Germination, Sperm Quality, and Fertilization. Journal of Reproduction & Infertility, 19(2), 69-81.
68Colagar, A. H., Marzony, E. T., & Chaichi, M. J. (2009). Zinc levels in seminal plasma are associated with sperm quality in fertile and infertile men. Nutrition Research (New York, N.Y.), 29(2), 82–88.
69Kilic, M., Baltaci, A. K., Gunay, M., Gökbel, H., Okudan, N., & Cicioglu, I. (2006). The effect of exhaustion exercise on thyroid hormones and testosterone levels of elite athletes receiving oral zinc. Neuro Endocrinology Letters, 27(1-2), 247–252.
70Prasad, A. S., Mantzoros, C. S., Beck, F. W., Hess, J. W., & Brewer, G. J. (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition (Burbank, Los Angeles County, Calif.), 12(5), 344–348
71Netter, A., Hartoma, R., & Nahoul, K. (1981). Effect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm count. Archives of Andrology, 7(1), 69–73.
72Cinar, V., Talaghir, L.G., Akbulut, T., Turgut, M., Sarikaya, M. (2018). The effects of the zinc supplementation and weight trainings on the testosterone levels. Human.Sport.Medicine. 17. 58-63. 10.14529/hsm170407.
73Hoffman, H. N., Phyliky, R. L., & Fleming, C. (1988). Zinc-induced copper deficiency. Gastroenterology, 94(2), 508-512.
74Chang, C. S., Choi, J. B., Kim, H. J., & Park, S. B. (2011). Correlation between serum testosterone level and concentrations of copper and zinc in hair tissue. Biological Trace Element Research, 144(1-3), 264–271.
75Duncan A, Yacoubian C, Watson N, and Morrison, I. (2015). The risk of copper deficiency in patients prescribed zinc supplements. Journal of Clinical Pathology 2015;68:723-725.
76Willis, M. S., Monaghan, S. A., Miller, M. L., McKenna, R. W., Perkins, W. D., Levinson, B. S., Bhushan, V., & Kroft, S. H. (2005). Zinc-Induced Copper Deficiency: A Report of Three Cases Initially Recognized on Bone Marrow Examination. American Journal of Clinical Pathology, 123(1), 125-131.
77Nishime, K., Kondo, M., Saito, K., Miyawaki, H., & Nakagawa, T. (2020). Zinc Burden Evokes Copper Deficiency in the Hypoalbuminemic Hemodialysis Patients. Nutrients, 12(2), 577.
78L'Abbé, M. R., & Fischer, P. W. (1984). The Effects of High Dietary Zinc and Copper Deficiency on the Activity of Copper-Requiring Metalloenzymes in the Growing Rat. The Journal of Nutrition, 114(5), 813-822.
79Oluboyo, A. O., Adijeh, R. U., Onyenekwe, C. C., Oluboyo, B. O., Mbaeri, T. C., Odiegwu, C. N., Chukwuma, G. O., & Onwuasoanya, U. F. (2012). Relationship between serum levels of testosterone, zinc and selenium in infertile males attending fertility clinic in Nnewi, south east Nigeria. African Journal of Medicine and Medical Sciences, 41 Suppl, 51–54.
80Pieczyńska, J., & Grajeta, H. (2015). The role of selenium in human conception and pregnancy. Journal of Trace Elements in Medicine and Biology, 29, 31-38.
81Al-Jawad, Z. & Al-fahham, A. (2021). The Effect of Ascorbic Acid and Selenium intake on serum Cortisol in Rats Under Restraint Stress. Indian Journal of Forensic Medicine & Toxicology. 15. 1681-1685. 10.37506/ijfmt.v15i1.13651.
82Watanabe, T., & Endo, A. (1991). Effects of selenium deficiency on sperm morphology and spermatocyte chromosomes in mice. Mutation Research Letters, 262(2), 93-99.
83Lukusa, K., & Lehloenya, K. (2017). Selenium supplementation improves testicular characteristics and semen quality of Saanen bucks. Small Ruminant Research, 151, 52-58.
84Ghorbani, A., Moeini, M. M., Souri, M., & Hajarian, H. (2017). Influences of dietary selenium, zinc and their combination on semen characteristics and testosterone concentration in mature rams during breeding season. Journal of Applied Animal Research, 46(1), 813–819.
85Shi, L., Song, R., Yao, X., Duan, Y., Ren, Y., Zhang, C., Yue, W., & Lei, F. (2018). Effects of maternal dietary selenium (Se-enriched yeast) on testis development, testosterone level and testicular steroidogenesis-related gene expression of their male kids in Taihang Black Goats. Theriogenology, 114, 95-102.
86Wang, S., Gu, X., Ma, J., Gu, Z., Zhang, R., Li, R., Bai, J., Li, P., Wei, L., Ye, Y., Wang, Y., Zhang, L., Su, L., & Liang, C. (2023). Selenium nanoparticles improve nickel-induced testosterone synthesis disturbance by down-regulating miR-708-5p/p38 MAPK pathway in Leydig cells. Environmental Toxicology, 38(8), 1846–1859.
87Ghafarizadeh, A. A., Vaezi, G., Shariatzadeh, M. A., & Malekirad, A. A. (2018). Effect of in vitro selenium supplementation on sperm quality in asthenoteratozoospermic men. Andrologia, 50(2), e12869.
88Appling, D. R., & Chytil, F. (1981). Evidence of a role for retinoic acid (vitamin A-acid) in the maintenance of testosterone production in male rats. Endocrinology, 108(6), 2120–2124.
89Huang, H. F., Dyrenfurth, I., & Hembree, W. C. (1983). Endocrine changes associated with germ cell loss during vitamin A-induced recovery of spermatogenesis. Endocrinology, 112(4), 1163–1171.
90Livera, G., Rouiller-Fabre, V., Pairault, C., Levacher, C., & Habert, R. (2002). Regulation and perturbation of testicular functions by vitamin A. Reproduction (Cambridge, England), 124(2), 173–180.
91Tucci, P., Cione, E. & Genchi, G. (2008). Retinoic acid-induced testosterone production and retinoylation reaction are concomitant and exhibit a positive correlation in Leydig (TM-3) cells. J Bioenerg Biomembr 40, 111–115.
92Jutley, J. K., Reaney, S., Kelleher, J., & Whelan, P. (1990). Interactions of retinoic acid and androgens in human prostatic tissue. The Prostate, 16(4), 299-304.
93Yang, Y., Luo, J., Yu, D., Zhang, T., Lin, Q., Li, Q., Wu, X., Su, Z., Zhang, Q., Xiang, Q., & Huang, Y. (2018). Vitamin A Promotes Leydig Cell Differentiation via Alcohol Dehydrogenase 1. Frontiers in Endocrinology, 9.
94Masterjohn, C. (2007). Vitamin D toxicity redefined: Vitamin K and the molecular mechanism. Medical Hypotheses, 68(5), 1026-1034.
95Takumi, N., Shirakawa, H., Ohsaki, Y., Ito, A., Watanabe, T., Giriwono, P. E., Sato, T., & Komai, M. (2011). Dietary vitamin K alleviates the reduction in testosterone production induced by lipopolysaccharide administration in rat testis. Food & Function, 2(7), 406–411.
96Ho, H.-J., Shirakawa, H., & Komai, M. (2017). Menaquinone‐4 Enhances Steroidogenesis in Testis Derived Tumor Cells Via the Elevation of cAMP Level. InTech.
97Shirakawa, H., Ohsaki, Y., Minegishi, Y., Takumi, N., Ohinata, K., Furukawa, Y., Mizutani, T., & Komai, M. (2006). Vitamin K deficiency reduces testosterone production in the testis through down-regulation of the Cyp11a a cholesterol side chain cleavage enzyme in rats. Biochimica et Biophysica Acta (BBA) - General Subjects, 1760(10), 1482-1488.