A handful of supplements have genuine evidence behind them for raising testosterone levels, though the effects are modest and depend heavily on whether you’re deficient in a given nutrient to begin with. If your testosterone is already in a healthy range and your diet covers your nutritional bases, most supplements will do little. But if you’re low in key micronutrients like vitamin D, zinc, or magnesium, correcting those gaps can produce measurable increases.
Vitamin D
Vitamin D functions more like a hormone than a typical vitamin, and your reproductive system has dedicated receptors for it. Men who are deficient in vitamin D tend to have lower testosterone, and supplementing can reverse that. In a year-long clinical trial, men who took roughly 3,300 IU of vitamin D daily saw their total testosterone rise from about 10.7 to 13.4 nmol/L, a roughly 25% increase. Free testosterone and bioactive testosterone both went up significantly as well. Men in the placebo group saw no change.
The catch: these gains are most pronounced if your vitamin D levels are low to begin with. Millions of people are deficient, especially those who live in northern latitudes, work indoors, or have darker skin. A simple blood test can tell you where you stand. If you’re already at healthy levels, extra vitamin D is unlikely to push testosterone higher.
Zinc
Zinc is directly involved in testosterone production, and the relationship between serum zinc and total testosterone is well established. A 2022 systematic review confirmed that zinc deficiency reliably reduces testosterone and that supplementation reliably improves it. The magnitude of the effect depends on how deficient you are, what form of zinc you take, the dose, and how long you supplement.
Groups at higher risk of zinc deficiency include vegetarians and vegans (plant-based diets contain compounds that reduce zinc absorption), heavy exercisers who lose zinc through sweat, and older adults. If your zinc status is already adequate, adding more won’t supercharge your testosterone. Oysters, red meat, and pumpkin seeds are among the richest dietary sources.
Magnesium
Magnesium plays a supporting role in hundreds of enzymatic processes, testosterone synthesis among them. A four-week study compared sedentary men and tae kwon do athletes, both supplemented with 10 mg of magnesium per kilogram of body weight daily. Both groups saw increases in free and total testosterone, but the athletes saw larger gains, suggesting that magnesium and exercise work together. Even at rest, supplementation raised testosterone in the sedentary group.
Roughly half of adults in the U.S. don’t get enough magnesium from food alone. Leafy greens, nuts, seeds, and whole grains are the best dietary sources. If your intake is already solid, supplementation is less likely to move the needle.
Fenugreek Extract
Fenugreek is one of the better-studied herbal options. It appears to work by blocking two enzymes that convert testosterone into other hormones (estrogen and dihydrotestosterone), which keeps more free testosterone circulating. In an eight-week trial of men doing resistance training, the group taking a standardized fenugreek glycoside extract saw free testosterone jump nearly 99% from baseline, compared to a 49% increase in the placebo group. Total testosterone didn’t change significantly in either group, which supports the idea that fenugreek shifts the balance of existing testosterone rather than prompting the body to produce more.
This distinction matters. If your concern is symptoms related to low free testosterone (low energy, reduced libido, difficulty building muscle), fenugreek may be relevant. Typical study doses range from 500 to 600 mg per day of a standardized extract.
Tongkat Ali
Tongkat Ali (Eurycoma longifolia) has a long history in Southeast Asian traditional medicine and has become a popular testosterone-support supplement in Western markets. The traditional dose ranges from 100 to 400 mg daily, though products marketed for testosterone and muscle building sometimes contain 1,000 to 1,600 mg per capsule. Most of the human research has used doses in the 200 to 400 mg range.
The evidence is promising but not as robust as what exists for vitamin D or zinc. Several small trials report improvements in testosterone levels, stress hormones, and subjective measures of well-being and libido. Quality control is a real concern here: products vary widely in their actual content of active compounds, so choosing a reputable, third-party tested brand matters more with tongkat ali than with basic vitamins and minerals.
Boron
Boron is a trace mineral that doesn’t get much attention, but a small body of research suggests it can influence hormone balance. In one study, 10 mg of boron daily for one week significantly increased free testosterone and decreased estradiol (a form of estrogen). It also reduced sex hormone binding globulin (SHBG), the protein that binds to testosterone and makes it unavailable for your body to use. Within just six hours of the first dose, SHBG levels had already dropped.
The research base is thin compared to zinc or vitamin D, so the strength of these findings should be kept in perspective. But boron is inexpensive and widely available, and 10 mg per day appears to be safe for most people.
D-Aspartic Acid: Inconsistent Results
D-aspartic acid (DAA) is heavily marketed as a testosterone booster, but the human evidence is genuinely mixed. One early study found that 3.12 grams daily for 12 days raised testosterone by 42%, which generated a lot of excitement. But subsequent, better-designed trials have failed to replicate that result. A study in resistance-trained men found zero effect on testosterone, free testosterone, or body composition after 28 days at the same dose. Another study in overweight men with low baseline testosterone also showed no significant change after 28 days.
Perhaps most concerning, one trial tested a higher dose of 6 grams per day and found that it actually reduced both total and free testosterone from baseline. The researchers speculated that high doses may trigger a negative feedback loop in hormone regulation. Given the inconsistency, DAA is one of the weaker options despite its popularity.
Safety Considerations
Basic micronutrients like vitamin D, zinc, and magnesium are generally safe at recommended doses, though zinc can cause nausea and interfere with copper absorption at high levels, and excessive vitamin D can lead to calcium buildup over time. The real safety concerns tend to involve herbal testosterone boosters and proprietary blends. Reports of liver injury linked to testosterone-boosting supplement products have been documented, with users showing elevated liver enzymes indicating damage. About 13% of annual acute liver failure cases in the U.S. are attributed to drug or supplement-induced injury.
Products purchased from unvetted sources carry additional risks, including contamination with unlisted ingredients or inaccurate dosing. Even products from reputable manufacturers and taken as directed can present health risks in some individuals. If you have existing liver or kidney concerns, this is worth discussing before starting any new supplement.
The Bigger Picture
For context, the clinical threshold for low testosterone is a total level below 300 ng/dL, measured on two separate morning blood draws. If your levels fall below that line, supplements alone are unlikely to be sufficient, and the conversation shifts to medical treatment. If your levels are in the low-normal range and you’re looking for an edge, correcting micronutrient deficiencies is the most evidence-backed place to start.
None of these supplements work in isolation. Sleep quality, body fat percentage, resistance training, and stress management all have larger effects on testosterone than any capsule. A man who sleeps six hours a night, carries significant excess body fat, and never lifts weights will get far less from a zinc tablet than one who has those foundations in place. Supplements fill gaps. They don’t replace the basics.