Several supplements have shown promise for increasing libido in clinical trials, though the strength of evidence varies widely. The best-supported options work through different mechanisms: lowering stress hormones, supporting blood flow, or influencing testosterone levels. Here’s what the research actually shows for each one.
Ashwagandha: The Stress-Libido Connection
Chronic stress is one of the most common libido killers, and this is where ashwagandha has the strongest case. The link is straightforward: high cortisol (your body’s primary stress hormone) suppresses sexual function. Research on 30 women found that those with lower baseline sexual function scores had measurably higher cortisol spikes even when exposed to erotic stimuli, suggesting stress hormones actively interfere with arousal.
Ashwagandha attacks this problem directly. In one trial, participants taking ashwagandha for 60 days saw a 27.9% reduction in cortisol from baseline. A separate placebo-controlled study in women found that ashwagandha significantly improved scores for arousal, lubrication, orgasm, and overall sexual satisfaction compared to placebo. If your low desire coincides with feeling stressed, burned out, or anxious, ashwagandha is one of the more logical supplements to try. Most studies use doses in the range of 300 to 600 mg daily of a root extract.
Tribulus Terrestris: Stronger Evidence Than Expected
Tribulus terrestris has a long reputation in traditional medicine, and a well-designed trial of 180 men with mild to moderate erectile dysfunction or low desire backs up some of those claims. Over 12 weeks, men taking a standardized tribulus extract showed statistically significant improvements in sexual desire, orgasmic function, intercourse satisfaction, and overall satisfaction compared to placebo. The improvements weren’t driven by hormonal changes; lab work showed no significant shifts in blood chemistry.
There’s an important caveat. The researchers specifically noted that their extract was standardized to contain a minimum amount of certain active compounds (furostanol saponins), and that results should not be assumed to apply to tribulus products from different sources or with different formulations. The supplement market is full of tribulus products that vary enormously in composition, so the brand and standardization matter more here than with most supplements.
Fenugreek and Testosterone
Fenugreek extract has been studied primarily in men for its potential to raise testosterone. A 12-week trial of 95 men aged 40 to 80 tested three different doses against placebo. The results were mixed in an instructive way: when measured in blood plasma, testosterone increases didn’t reach statistical significance compared to placebo, even though they rose from baseline. But salivary testosterone, which reflects the “free” or biologically active form, increased by 37.2% compared to placebo at the combined doses, and 19.6% at the highest dose of 1,800 mg.
The study participants also filled out questionnaires on libido, but the researchers didn’t publish detailed results on those scores, so we’re left with the hormonal data alone. The testosterone bump is real but modest, and whether it translates to noticeably higher desire likely depends on whether low testosterone was part of your problem in the first place. If you suspect it is, fenugreek at 600 mg or higher daily is a reasonable option to discuss with your doctor alongside proper hormone testing.
Maca Root: Popular but Poorly Studied
Maca is one of the most widely sold libido supplements, but the clinical evidence is thinner than its popularity suggests. A controlled trial testing 3 grams per day of maca root in women with medication-related sexual dysfunction was terminated early after enrolling only 8 subjects, far too few to produce meaningful data. Other small studies exist, but most have significant limitations in design or sample size.
That doesn’t mean maca is ineffective. It means we don’t have high-quality human trials confirming what dose works, how large the effect is, or who benefits most. Many people report subjective improvements, and maca has a long history of traditional use in Peru. At typical doses of 1.5 to 3 grams daily, it appears safe. Just know that you’re relying more on anecdotal evidence than clinical proof.
L-Citrulline: A Blood Flow Approach
Physical arousal in both men and women depends heavily on blood flow, which is regulated by a molecule called nitric oxide. L-citrulline is an amino acid your kidneys convert into L-arginine, which then produces nitric oxide. The result is relaxed, more open blood vessels and improved circulation throughout the body, including to genital tissue.
L-citrulline supplements have shown potential for easing symptoms of mild to moderate erectile dysfunction. Some studies have used doses up to 6 grams per day, though no optimal dose has been established. L-citrulline is generally preferred over taking L-arginine directly because it’s better absorbed and produces a more sustained increase in nitric oxide levels. This supplement addresses the physical mechanics of arousal rather than desire itself, so it’s most useful if your issue is more about physical response than mental interest.
Ginseng: Weaker Than Advertised
Panax ginseng is marketed heavily for sexual health, but a meta-analysis pooling five studies with 531 women found no statistically significant effect on sexual function compared to placebo. The overall effect size was small and the confidence interval crossed zero, meaning the data couldn’t rule out that ginseng does nothing at all for female sexual desire. Evidence in men is somewhat more encouraging for erectile function specifically, but for libido as a standalone concern, ginseng doesn’t have strong support.
Yohimbe: Effective but Risky
Yohimbe (and its active compound yohimbine) is one of the older remedies for sexual dysfunction, and prescription yohimbine has been used clinically. But the supplement version carries serious safety concerns. Yohimbine has been linked to irregular heartbeat, rapid heart rate, blood pressure spikes, heart attacks, and seizures. A review of California Poison Control calls over seven years found that yohimbe consistently caused stomach problems, racing heart, anxiety, and hypertension.
Making matters worse, a 2015 analysis of 49 yohimbe supplements found that the actual yohimbine content varied enormously between products, and most labels didn’t even list how much they contained. You can’t dose something safely if you don’t know how much you’re taking. Yohimbe also interacts dangerously with certain antidepressants, including MAO inhibitors and tricyclics. For most people, the risk-to-benefit ratio here simply isn’t favorable when safer alternatives exist.
Choosing the Right Supplement for You
The best supplement depends on what’s driving your low libido. If stress and burnout are the main culprits, ashwagandha targets that mechanism directly with solid clinical evidence. If you suspect low testosterone (common in men over 40), fenugreek has the most relevant hormonal data. For physical arousal difficulties, L-citrulline addresses blood flow without the risks of yohimbe. Tribulus terrestris has surprisingly strong trial data for overall sexual satisfaction in men, though product quality varies widely.
Keep in mind that supplements work best when the basics are covered. Sleep deprivation, sedentary habits, excessive alcohol, and relationship stress all suppress libido through pathways that no capsule can fully override. A supplement can give you a meaningful nudge, but it works alongside those foundations, not instead of them.