Testosterone Support for Men
About this protocol
Where to start
Start with vitamin D3 and zinc if you are not already supplementing. Both have direct evidence for testosterone-relevant pathways and address common dietary/lifestyle gaps. Check a 25-OH vitamin D level first if you can — supplementation works best in the deficient or insufficient range.
Add ashwagandha (KSM-66 standardized extract) if chronic stress is part of the picture. The trial evidence is strongest in stressed or moderately untrained men; less clear in well-trained athletes.
Boron is the most speculative — small studies show effects on free testosterone and SHBG but the literature is thin. Worth a structured 8-12 week trial.
If your numbers and symptoms don't move with this stack plus solid lifestyle, see an endocrinologist. Don't keep adding supplements.
4 nutrients
Start here
Strongest evidence — the foundation of the stack.
Vitamin D3
2000-4000 IU daily, with breakfastVitamin D acts as a steroid-hormone precursor and receptor-modulator throughout the body. Observational studies link low 25-OH vitamin D with lower testosterone, and a randomized trial in vitamin-D-deficient men showed supplementation raised total testosterone over one year. The effect is largest in the deficient range — replete men do not see further increases. Fat-soluble; take with a fat-containing meal.[1, 2, 3]
Zinc
15-30 mg elemental, with breakfastZinc is essential for testosterone biosynthesis, and severe zinc deficiency demonstrably suppresses testosterone in human studies. In replete men, additional supplementation does not raise testosterone further — this is a deficiency-correction nutrient, not a stack-amplifier. Picolinate and bisglycinate forms are well-absorbed. Do not exceed 40 mg/day for extended periods (chronic high zinc depletes copper).[4, 5, 6]
Add if needed
Add these only if the foundation isn't enough.
Ashwagandha (KSM-66)
600 mg, with breakfastAshwagandha (Withania somnifera, standardized KSM-66 extract) has trial evidence for modest increases in total testosterone in stressed and moderately trained men over 8-16 weeks, alongside reductions in cortisol and perceived stress. The mechanism appears to be HPA-axis modulation rather than direct testicular stimulation. Not a substitute for solving the underlying stress source.[7, 8, 9]
Experimental
Emerging evidence — try last, only if curious.
Boron
5-10 mg daily, with breakfastBoron is a trace mineral with small human trials suggesting effects on free testosterone, SHBG, and estradiol metabolism. The studies are small and short — treat as the most speculative item in this stack. Generally well-tolerated. A 8-12 week structured trial is reasonable.[10, 11, 12]
Warnings
Lifestyle improvements
Resistance training is the strongest endogenous lever
3-5 sessions per week of compound lifts (squat, deadlift, press, pull) reliably supports testosterone, especially when combined with adequate protein and recovery. Cardio alone does not.
Sleep 7-9 hours
A single week of sleep restriction to 5 hours suppresses testosterone by 10-15% in healthy men. This is the highest-leverage intervention available — no supplement can compensate for chronic sleep deprivation.
Body composition matters
Excess adipose tissue, especially visceral fat, increases aromatase activity (testosterone → estradiol conversion). Losing 5-10% of body weight in overweight men reliably raises testosterone.
Limit alcohol
Heavy alcohol intake suppresses LH and direct testicular function. Moderate intake (1-2 drinks max, not daily) has minimal effect for most men.
Manage chronic stress
Cortisol and testosterone share precursor pathways and are inversely correlated in chronic stress. Address chronic work, financial, or relationship stressors directly — the ashwagandha is a small layer on top of that work.
Annual labs
Track total + free testosterone, SHBG, estradiol, LH, FSH, and morning cortisol. Lab work tells you whether the stack is moving anything; symptoms are a poor proxy.
References
- Vitamin D — supplement research overviewExamine.com link
- Pilz S, et al. Effect of vitamin D supplementation on testosterone levels in men. Horm Metab Res. 2011;43(3):223-225.PubMed link
- Lerchbaum E, et al. Vitamin D and Testosterone in Healthy Men: A Randomized Controlled Trial. J Clin Endocrinol Metab. 2017;102(11):4292-4302.PubMed link
- Zinc — supplement research overviewExamine.com link
- Prasad AS, et al. Zinc status and serum testosterone levels of healthy adults. Nutrition. 1996;12(5):344-348.PubMed link
- Fallah A, et al. Zinc is an Essential Element for Male Fertility: A Review of Zn Roles in Men's Health. J Reprod Infertil. 2018;19(2):69-81.PubMed link
- Ashwagandha — supplement research overviewExamine.com link
- Lopresti AL, et al. A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha in Aging, Overweight Males. Am J Mens Health. 2019;13(2).PubMed link
- Wankhede S, et al. Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial. J Int Soc Sports Nutr. 2015;12:43.PubMed link
- Boron — supplement research overviewExamine.com link
- Naghii MR, et al. Comparative effects of daily and weekly boron supplementation on plasma steroid hormones and proinflammatory cytokines. J Trace Elem Med Biol. 2011;25(1):54-58.PubMed link
- Pizzorno L. Nothing Boring About Boron. Integr Med (Encinitas). 2015;14(4):35-48.PubMed link
Track this protocol in Pilora
Add these supplements to your shelf, get smart dose reminders, and check for interactions — all in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.