Support Your Body’s Natural Testosterone Production for Strength, Muscle Growth, and Overall Health
BBCOM Editors
January 10, 2025
What Is Testosterone?
Testosterone is the primary sex hormone governing the development and maintenance of male physical traits. It also serves as the body’s key anabolic hormone, supporting muscle growth, strength, bone density, and libido. The normal physiological range for men is 300 to 1,000 nanograms per deciliter (ng/dL).
Do You Need a Testosterone-Boosting Supplement?
As men age, natural testosterone production declines—leading to a cascade of physiological and psychological symptoms. On average, men over 40 experience a yearly reduction of 1.6% in total testosterone and 2.5% in bioavailable testosterone for the remainder of their lives.
Individuals with low testosterone may exhibit:
Physical changes: Muscle mass loss, reduced muscular strength, decreased bone density, impaired mitochondrial function, weight gain, hair loss, and fatigue.
Psychological changes: Low motivation, depression, irritability, and poor focus.
Sexual dysfunction: Diminished libido, erectile dysfunction, difficulty achieving/sustaining erections, or testicular atrophy.
If you suspect low or declining testosterone levels, consult a healthcare provider for diagnostic testing—never self-diagnose or self-prescribe.
How to Naturally Boost Testosterone Levels
To support natural testosterone production, many individuals turn to evidence-based testosterone-boosting supplements. Research shows these supplements can:
Alleviate symptoms of age-related hypogonadism (low testosterone).
Enhance strength, endurance, and muscle mass.
Improve sexual performance and cognitive function.
While numerous products claim to “boost T levels,” quality and efficacy vary significantly.
Why Choose Bodybuilding.com’s Signature Test Booster?
Bodybuilding.com’s Signature Test Booster features a science-backed blend of ingredients clinically shown to support natural testosterone production. Its formula includes:
600 mg KSM-66™ Ashwagandha
300 mg Fenugreek Extract
300 mg Tribulus Terrestris Extract
Zinc, Magnesium, and Vitamin B6 (ZMA complex)
Supporting healthy testosterone levels may aid in:
Muscle growth and retention
Metabolic enhancement and fat loss
Faster exercise recovery
Ingredient Breakdown
Every component in Signature Test Booster is selected for its unique, research-supported benefits:
KSM-66™ Ashwagandha Extract (Withania somnifera)
KSM-66™ is a patented, full-spectrum ashwagandha extract—a potent adaptogen celebrated for its ability to support testosterone production and mitigate stress. It contains bioactive compounds (alkaloids, flavonoids, glycosides, steroidal lactones) and has been a cornerstone of Ayurvedic medicine for millennia.
Research confirms ashwagandha supplementation:
Offers robust antioxidant and anti-inflammatory effects.
Reduces stress and anxiety.
Enhances cardiovascular endurance.
Supports natural testosterone synthesis.[1-4]
Clinically validated, KSM-66™ delivers measurable benefits:
17% increase in testosterone
53% increase in semen volume
167% increase in sperm concentration
34% increase in luteinizing hormone (LH)
57% increase in sperm motility.[5]
Fenugreek Extract (Trigonella foenum-graecum)
Fenugreek is a plant native to India and North Africa, utilized worldwide as an herb, spice, and traditional medicine.[6] Historically, it has been used to restore vitality and enhance libido.
Scientists attribute fenugreek’s efficacy to furostanolic saponins—compounds that may stimulate testosterone production. Key research includes:
A 2017 study of 50 men (35–65 years old) found 500 mg of fenugreek increased free testosterone levels by 46% to 90% and improved sperm count in 85.4% of participants.[7]
A placebo-controlled trial demonstrated significant enhancements in strength and body composition with fenugreek supplementation.[8]
Tribulus Extract (Tribulus terrestris)
Tribulus terrestris is a traditional herb historically used as a natural aphrodisiac. Emerging evidence shows it contains steroidal saponins (e.g., protodioscin) that modulate luteinizing hormone (LH)—a key regulator of testosterone synthesis.[9]
While research is ongoing, a study of 30 athletes found Tribulus supplementation may:
Act as a testosterone-supporting agent.
Aid recovery from physical exertion.
Reduce fatigue.[10]
Zinc, Magnesium, and Vitamin B6 (ZMA Complex)
The combination of zinc, magnesium, and vitamin B6—known as ZMA—is an evidence-based formula for supporting anabolic hormone production and sleep quality.
Zinc and magnesium: Essential minerals for muscle health and testosterone synthesis. They play foundational roles in metabolic reactions, including hormone production.[11]
Vitamin B6: Enhances the absorption and utilization of zinc/magnesium while supporting over 100 enzymatic reactions (hormone function, energy metabolism).
Research shows ZMA supplementation:
Enhances anabolic hormone profiles.
Reduces catabolism (muscle breakdown).
Improves immune function.
Supports adaptations to resistance training.[12]
Key Takeaways
Our testosterone booster features a synergistic blend of KSM-66™ Ashwagandha, fenugreek, Tribulus terrestris, and essential micronutrients—all selected to support natural testosterone production. Each ingredient is chosen for its unique contributions to:
Hormone regulation
Muscle recovery
Fat metabolism
Energy, libido, and overall health
References
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.
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.
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.
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.
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, 2013, 571420.
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.
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.
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.
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.
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.
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.
Brilla, L.R., Conte, V. (2000). Effects of a Novel Zinc-Magnesium Formulation on Hormones and Strength. JEPonline, 3(4): 26–36.
