Support your body’s natural testosterone production to maintain strength, build muscle strength, and improve overall health.

BBCOM Editors
January 10, 2025

What is Testosterone?

Testosterone is the primary sex hormone responsible for the development and maintenance of male physical characteristics. It is also the body’s main anabolic hormone for muscle growth, strength, bone density, and libido. The normal range for men is between 300 and 1,000 nanograms per deciliter (ng/dL).

Do You Need a Testosterone Boosting Supplement?

As men age, their natural testosterone production will decrease causing many physiological  symptoms. On average, men over 40 years old will lose 1.6% loss of total testosterone 2.5% bioavailable testosterone per year for the rest of their lives. People with low testosterone can start to lose muscle mass, muscular strength, bone density, and mitochondrial function. They may feel unmotivated, depressed, irritable, and unfocused. They may also gain weight, lose hair, feel exhausted, and experience sexual dysfunction such as low libido, erectile dysfunction, difficulty achieving or maintaining erections, and even testicular shrinkage. If you feel like you have a low or declining testosterone levels, you should consult a doctor and get tested.

How Can You Naturally Boost Your Testosterone Levels?

If you want to boost your natural testosterone levels, you may want to try a testosterone boosting supplement. Studies have shown many supplements can help with the symptoms of  age-related hypogonadism as well as increase strength, endurance, and muscle mass. It can improve sexual performance and help with overall cognitive function. There are many brands and products on the market promising to help enhance your T Levels. 

Why Choose Bodybuilding.com’s Signature Test Booster?

Signature Test Booster contains several ingredients proven to naturally increase your testosterone levels. It has 600mg KSM-66, 300mg fenugreek, and 300mg Tribulus as well as zinc, magnesium, and vitamin B6.  Increasing your testosterone levels can help with building muscle, increasing metabolism, reducing body fat, and improving exercise recovery.   

Ingredient Breakdown

KSM-66™ Ashwagandha Extract (Withania Somnifera)

KSM-66 is a trademarked version of ashwagandha which is a potent adaptogenic herb renowned for supporting testosterone production and reducing stress. It contains numerous bioactive compounds such as alkaloids, flavonoids, glycosides, and steroidal lactones and have been used in traditional ayurvedic medicine. ashwagandha supplementation has potent antioxidant and anti-inflammatory properties, can reduce stress and anxiety, improve cardiovascular endurance and increase natural testosterone levels.[1-4] KSM-66™ is a trademarked compound that has been clinically proven to increase testosterone by 17%, semen volume by 53%, sperm concentration by 167%, luteinizing hormone by 34% and sperm motility by 57%.[5]

Fenugreek Extract (Trigonella Foenum-Graecum)

Fenugreek is a plant native to India and North Africa and used globally as an herb, food, spice, and traditional medicine.[6] Many people have used this medicinal herb to restore vitality and boost libido. Scientists hypothesize that fenugreek contains compounds called furostanolic saponins, which help increase testosterone production. In a 2017 study involving 50 men ages 35 to 65 found that taking 500mg of fenugreek led to an increase in free testosterone levels from 46% to 90% and improvements in sperm count for 85.4% of the participants.[7]  Another placebo controlled study found that fenugreek supplementation led to significant increases in strength and body composition.[8]

Tribulus Extract (Tribulus Terrestris) 

Tribulus terrestris is a traditional herb known for its uses as a natural aphrodisiac. Recently scientific literature has found that Tribulus contains steroidal saponins such as protodioscin, which can influence luteinizing hormone (LH) to increase testosterone production.[9] Although research is still ongoing, a study found that 30 athletes while taking Tribulus may act as a testosterone booster helping the recovery after physical loads and mitigating fatigue.[10]

Zinc, Magnesium, and Vitamin B6

The combination of zinc, magnesium, and vitamin B6 sometimes referred to as ZMA is a proven formula to help improve your sleep quality and increase your anabolic hormones. Both magnesium and zinc are minerals required by the body for the maintenance of healthy muscles. magnesium and zinc play a fundamental role in numerous metabolic reactions including the production of testosterone.[11] Vitamin B6 aids in the absorption and utilization of zinc and magnesium, enhancing the benefits of this formula. Additionally, B6 is involved in over 100 enzyme reactions in the body, including those tied to hormone function and energy metabolism. ZMA supplementation has been shown to help enhance anabolic hormonal profiles, reduce catabolism, improve immune status, and/or improve adaptations to resistance training.[12]

Takeaways

Our testosterone booster offers a blend of KSM-66, ashwagandha, fenugreek, tribulus Terrestris, and essential micronutrients to support natural testosterone production. Each ingredient has been chosen for its unique effects on hormones, muscle recovery, and fat metabolism, as well as its role in maintaining energy, libido, and overall health.  

References

1. Lopresti, 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), e17186. https://doi.org/10.1097/MD.0000000000017186
2. Nasimi Doost Azgomi, R., Zomorrodi, A., Nazemyieh, H., Fazljou, S. M. B., Sadeghi Bazargani, H., Nejatbakhsh, F., Moini Jazani, A., & Ahmadi AsrBadr, Y. (2018). Effects of Withania somnifera on Reproductive System: A Systematic Review of the Available Evidence. BioMed research international, 2018, 4076430. https://doi.org/10.1155/2018/4076430
3. Wankhede, 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, 43. https://doi.org/10.1186/s12970-015-0104-9
4. Chandrasekhar, K., Kapoor, J., & Anishetty, S. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian journal of psychological medicine, 34(3), 255–262. https://doi.org/10.4103/0253-7176.106022 
5. Ambiye, V. R., Langade, D., Dongre, S., Aptikar, P., Kulkarni, M., & Dongre, A. (2013). Clinical Evaluation of the Spermatogenic Activity of the Root Extract of Ashwagandha (Withania somnifera) in Oligospermic Males: A Pilot Study. Evidence-based complementary and alternative medicine: eCAM, 2013, 571420. https://doi.org/10.1155/2013/571420 
6. Nagulapalli Venkata, K. C., Swaroop, A., Bagchi, D., & Bishayee, A. (2017). A small plant with big benefits: Fenugreek (Trigonella foenum-graecum Linn.) for disease prevention and health promotion. Molecular nutrition & food research, 61(6), 10.1002/mnfr.201600950. https://doi.org/10.1002/mnfr.201600950 
7. Maheshwari, A., Verma, N., Swaroop, A., Bagchi, M., Preuss, H. G., Tiwari, K., & Bagchi, D. (2017). Efficacy of FurosapTM, a novel Trigonella foenum-graecum seed extract, in Enhancing Testosterone Level and Improving Sperm Profile in Male Volunteers. International journal of medical sciences, 14(1), 58–66. https://doi.org/10.7150/ijms.17256
8. Poole, 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. https://doi.org/10.1186/1550-2783-7-34 
9. Yin, L., Wang, Q., Wang, X., & Song, L. N. (2016). Effects of Tribulus terrestris saponins on exercise performance in overtraining rats and the underlying mechanisms. Canadian journal of physiology and pharmacology, 94(11), 1193–1201. https://doi.org/10.1139/cjpp-2016-0086
10. Fernández-Lázaro, D., Mielgo-Ayuso, J., Del Valle Soto, M., Adams, D. P., González-Bernal, J. J., & Seco-Calvo, J. (2021). The Effects of 6 Weeks of Tribulus terrestris L. Supplementation on Body Composition, Hormonal Response, Perceived Exertion, and CrossFit® Performance: A Randomized, Single-Blind, Placebo-Controlled Study. Nutrients, 13(11), 3969. https://doi.org/10.3390/nu13113969 
11. Wilborn, C. D., Kerksick, C. M., Campbell, B. I., Taylor, L. W., Marcello, B. M., Rasmussen, C. J., Greenwood, M. C., Almada, A., & Kreider, R. B. (2004). Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism. Journal of the International Society of Sports Nutrition, 1(2), 12–20. https://doi.org/10.1186/1550-2783-1-2-12
12. Brilla, L.R., Conte, V. (2000). Effects of a Novel Zinc-Magnesium Formulation on Hormones and Strength. JEPonline, 3(4): 26-36.