The supplements with the best human evidence are zinc when you are zinc-deficient, ashwagandha, tongkat ali and possibly fenugreek. A 2026 meta-analysis of randomized trials found that ashwagandha increased testosterone in men, although results differed by extract, dose and participant characteristics.
No over-the-counter supplement reliably raises testosterone as effectively as medical treatment for genuine hypogonadism. Most commercial testosterone boosters contain ingredients with little or inconsistent evidence.
Testosterone-Boosting Supplements at a Glance
| Supplement | Evidence for increasing testosterone | Best use |
|---|---|---|
| Zinc | Mainly useful when zinc deficiency or low intake is present | Correcting a deficiency |
| Ashwagandha | The strongest current herbal evidence, although effects vary by extract and person | Men with stress, poor sleep or low baseline testosterone |
| Tongkat ali | Promising results from small clinical trials and one meta-analysis | A carefully selected, independently tested extract |
| Fenugreek | May produce a small increase in total testosterone, but evidence certainty is very low | An optional, secondary choice |
| Vitamin D | Does not reliably raise testosterone in current randomized evidence | Correcting vitamin D deficiency for general health |
| Magnesium | Limited evidence, mainly relevant to people with low intake or deficiency | Meeting magnesium needs, not as a dependable testosterone booster |
Most studies have involved men, often in small groups and over short treatment periods. Results in women should not be assumed to be the same.
1. Zinc Can Increase Testosterone When Zinc Levels Are Low
Zinc is one of the most sensible supplements to consider when your diet is low in zinc or a healthcare professional identifies a deficiency. Zinc deficiency is associated with impaired testosterone status. Taking extra zinc when your intake is already adequate does not reliably produce a meaningful increase.
Good dietary sources include oysters, beef, poultry, dairy products, beans, nuts and fortified cereals. Adult men need about 11 mg of zinc daily from food and supplements combined. The adult upper limit is 40 mg per day unless a clinician recommends otherwise.
Long-term high-dose zinc can interfere with copper absorption and cause copper deficiency.
Practical verdict: Consider zinc for a confirmed or likely deficiency, not as a high-dose testosterone booster.
2. Ashwagandha Has the Strongest Evidence Among Herbal Options
Ashwagandha, also called Withania somnifera, is the most reasonable herbal supplement to consider for a modest testosterone increase. The National Center for Complementary and Integrative Health describes the evidence as limited, but notes that some preparations used for two to four months may increase testosterone and improve sperm quality.
Ashwagandha may be more useful when stress, poor sleep or high training demands are contributing to lower testosterone. It is not a substitute for testing or diagnosing low testosterone.
Ashwagandha is not risk-free. Rare cases of liver injury have been reported. It may also interact with thyroid medicines, sedatives, immunosuppressants, diabetes medicines and blood-pressure medicines. People with thyroid or autoimmune disorders, hormone-sensitive prostate cancer, or upcoming surgery should seek medical advice before using it.
Practical verdict: If you want to try one herbal option, choose a clearly labeled, standardized ashwagandha extract rather than a proprietary testosterone blend.
3. Tongkat Ali Is Promising but Not Firmly Established
Tongkat ali, also known as Eurycoma longifolia or longjack, may increase total testosterone in some men. A systematic review and meta-analysis of clinical trials found a statistically significant increase in testosterone, including in some men with hypogonadism. The evidence base included relatively few trials, and products can differ substantially in extract quality and standardization.
Tongkat ali is better classified as promising but uncertain than proven. It is not a substitute for medical evaluation when testosterone is genuinely low.
Practical verdict: Consider it only as a secondary option, preferably from a product with independent testing and a transparent extract specification.
4. Fenugreek May Have a Small Effect, but the Evidence Is Weak
Fenugreek may slightly increase total testosterone, but current evidence does not show a reliable improvement in free testosterone. A 2026 meta-analysis found a small favorable effect on total testosterone. Evidence for free testosterone was inconsistent and rated very low certainty. Earlier reviews also found mixed results across different fenugreek extracts.
Fenugreek can affect blood sugar and may interact with medicines. Extracts used in studies are not necessarily equivalent to ordinary fenugreek powder or the ingredient used in a commercial blend.
Practical verdict: Fenugreek is optional, but it should not be a first-line choice for raising testosterone.
5. Vitamin D Is Important for Health, but It Is Not a Reliable Testosterone Booster
Vitamin D supplementation should correct vitamin D deficiency, not be used solely to increase testosterone. A recent systematic review and meta-analysis of randomized trials found no statistically clear or reproducible effect of vitamin D on total testosterone or markers of androgen availability in adult men.
Vitamin D status can be checked with a blood test. For adults, the general upper limit for daily vitamin D intake is 4,000 IU from all sources, although a clinician may temporarily prescribe more to treat a documented deficiency.
Excessive vitamin D supplementation can cause high calcium levels, kidney stones and other complications.
Practical verdict: Take vitamin D for a documented deficiency or an established clinical reason, not because it is marketed as a testosterone enhancer.
6. Magnesium May Help When Intake Is Inadequate
Small studies have reported increases in testosterone after magnesium supplementation, particularly in physically active participants. Broader reviews of micronutrient trials, however, have found that the overall effect of mineral supplementation on sex hormones remains unclear.
Magnesium is useful when dietary intake is inadequate. There is not strong evidence that taking extra magnesium will substantially increase testosterone in people who already consume enough.
Practical verdict: Use magnesium to meet nutritional needs, not as a dependable testosterone booster.
Supplements That Usually Do Not Deliver What the Label Promises
Research on commercial testosterone boosters is generally unfavorable. One systematic review covering 27 proposed testosterone-boosting ingredients found that most failed to increase total testosterone consistently.
Be cautious with:
- Tribulus terrestris, which has not shown consistent testosterone benefits.
- D-aspartic acid, for which results are inconsistent and benefits may not persist.
- Maca, which may support libido but does not reliably raise testosterone.
- Creatine, which can improve strength and training performance but is not a dependable testosterone supplement.
- DHEA, which is a hormone precursor rather than a simple nutrient and has not reliably increased testosterone in exercise studies. DHEA can also cause androgenic effects and interact with hormone-sensitive conditions.
- Proprietary testosterone blends, because the label may hide individual ingredient amounts and the finished product may not have been tested as a combination.
The Safest Way to Approach Low Testosterone
Low testosterone should not be diagnosed from fatigue, low motivation or a single home-test result. The Endocrine Society states that diagnosis requires compatible symptoms plus consistently low testosterone confirmed with at least two early-morning blood tests.
Clinicians may also investigate sleep disorders, obesity, medication use, excessive exercise, nutritional problems and other medical causes.
A sensible approach is:
- Test before supplementing heavily. Ask a clinician about morning total testosterone testing if you have persistent symptoms.
- Correct deficiencies first. Zinc and vitamin D are most useful when intake or blood levels are low.
- If trying an herb, use one product at a time. This makes side effects and benefits easier to identify.
- Avoid megadoses. In particular, do not exceed 40 mg of zinc daily over the long term without medical supervision.
- Choose independently tested products. The FDA does not approve dietary supplements for safety or effectiveness before they reach the market. USP Verification, NSF certification or comparable independent testing can provide extra quality assurance, although certification does not prove that a product raises testosterone.
Bottom Line
For most people, the best supplement strategy is not a large testosterone stack.
- Zinc: worthwhile when deficient.
- Ashwagandha: the strongest herbal candidate, with limited but supportive evidence.
- Tongkat ali: promising, but less established and highly dependent on product quality.
- Fenugreek: possibly helpful, but the effect appears small and uncertain.
- Vitamin D and magnesium: useful for correcting inadequate intake or deficiency, but not reliable testosterone boosters.
If blood tests confirm hypogonadism, supplements are unlikely to address the underlying cause as effectively as appropriate medical treatment.