Several supplements have good evidence for improving sperm count, with zinc, ashwagandha, vitamin B12, and CoQ10 among the most studied. Results take time: a full cycle of sperm production lasts about 64 days, so most trials run for at least two to three months before measuring changes. Here’s what the evidence supports and what to realistically expect.
Why Results Take at Least Three Months
Your body produces sperm in a continuous cycle that takes roughly 64 days from start to finish. That means any supplement, lifestyle change, or medication you start today is acting on sperm that won’t be mature and ready for another two months at minimum. Most clinical trials measure outcomes at the three-month mark for this reason. If you start a supplement and see no change after two weeks, that’s completely expected.
Zinc
Zinc is one of the most consistently studied minerals for male fertility. In a controlled trial, men with low sperm motility who took 57 mg of zinc twice daily for three months saw significant improvements in sperm count, motility, and overall sperm quality. A separate preliminary trial using higher doses (240 mg per day) in men with low semen zinc levels found increased sperm counts, with 3 out of 11 men achieving successful pregnancies during the study period.
A typical recommended dose is around 60 mg per day, paired with 2 mg of copper. The copper matters because long-term zinc supplementation can deplete your copper stores. If you eat a diet low in red meat, shellfish, and seeds, there’s a reasonable chance your zinc levels are below optimal.
Ashwagandha
Ashwagandha root extract has some of the most striking numbers in recent fertility research. A randomized, double-blind, placebo-controlled study published in Frontiers in Reproductive Health found that after eight weeks of supplementation, men experienced a 38% increase in total sperm count, a 33% rise in sperm concentration, an 87% improvement in total sperm motility, and a 36% increase in ejaculate volume. The extract used was a standardized root form (KSM-66 is the most common commercial version), typically dosed at 600 mg per day.
Vitamin B12
In one study, infertile men who took 1,500 mcg per day of a form of B12 called methylcobalamin for 2 to 13 months saw improved sperm counts roughly 60% of the time. B12 plays a role in DNA synthesis and cell division, both of which are critical during sperm production. Men following plant-based diets are especially likely to be low in B12, making supplementation a simple starting point.
CoQ10
Coenzyme Q10 is an antioxidant your cells use to produce energy. There is evidence that doses as low as 10 mg per day over two weeks can increase sperm count and motility. In a longer study, men with low sperm counts who took 60 mg per day for about three months didn’t see dramatic changes in semen analysis numbers, but their in-vitro fertilization rates improved significantly. CoQ10 appears to work primarily by protecting sperm cells from oxidative damage, which can impair both motility and DNA integrity.
L-Carnitine
L-carnitine helps shuttle fatty acids into cells for energy production. In preliminary studies, men who supplemented with 3 to 4 grams per day for four months saw normalized sperm motility. Like CoQ10, L-carnitine also functions as an antioxidant, reducing the reactive oxygen species that damage sperm membranes. Some fertility specialists recommend combining L-carnitine with CoQ10, since both target oxidative stress through slightly different pathways.
Omega-3 Fatty Acids (DHA)
The omega-3 fat DHA is a structural component of sperm cell membranes. Its six double bonds give the membrane the flexibility sperm need to swim effectively and penetrate an egg. DHA content is positively correlated with both sperm concentration and motility, and men with fertility problems often have lower DHA levels in their semen.
In a clinical trial, 10 weeks of dietary DHA supplementation increased DHA levels in seminal plasma, improved total antioxidant capacity, and decreased the percentage of sperm with DNA damage. DHA also appears to support testosterone production in the testes. Fish oil or algae-based DHA supplements (typically 500 to 1,000 mg of combined EPA and DHA per day) are the most common sources.
Vitamin E and Selenium
Vitamin E is another antioxidant with direct evidence for fertility. Men with low fertilization rates during previous IVF attempts who took 200 IU of vitamin E daily saw significantly improved fertilization rates after just one month, along with reduced oxidative stress on sperm cells.
Selenium works along a different track. In a double-blind study, infertile men who took 100 mcg of selenium per day for three months had significantly improved sperm motility, though not sperm count. Notably, 11% of the men in the selenium group achieved a pregnancy during the study, compared to none in the placebo group. Selenium is incorporated into proteins that protect developing sperm from oxidative damage.
Maca and Asian Ginseng
Maca root, a Peruvian plant, has shown promise in a small clinical trial where healthy men taking 1,500 to 3,000 mg of dried maca powder daily experienced increased sperm counts and enhanced motility. Asian ginseng, dosed at 4 grams per day for three months, produced similar improvements in a preliminary study. Both are widely available and generally well tolerated, though the evidence base is thinner than for zinc or ashwagandha.
L-Arginine
L-arginine is an amino acid involved in cell division and blood flow. For men whose sperm count is above 10 million per milliliter but still below the fertile range, many fertility specialists recommend up to 4 grams of L-arginine per day for several months. It’s generally not recommended for men with very low counts (under 10 million), where the underlying cause may not respond to amino acid supplementation alone.
Prescription Options
If supplements aren’t enough, some doctors prescribe a medication originally designed for female ovulation (clomiphene citrate) off-label for men. It works by signaling the brain to produce more of the hormones that drive both testosterone production and sperm creation. In one study, men on this medication saw average sperm concentration rise from 15.2 million per milliliter to 62.8 million, a roughly fourfold increase. Sperm motility also improved significantly. The typical starting dose is 25 mg daily or 50 mg every other day. This requires a prescription and monitoring through blood work.
Putting a Plan Together
If you’re looking for a starting stack based on the strongest evidence, zinc (60 mg with 2 mg copper), ashwagandha (600 mg standardized extract), CoQ10 (100 to 200 mg), and a DHA-rich omega-3 (500 to 1,000 mg) cover multiple mechanisms: antioxidant protection, hormonal support, and structural membrane health. Adding vitamin B12 makes sense if your diet is low in animal products.
Commit to at least three months before retesting. A semen analysis is the only reliable way to measure progress, since you won’t feel a difference in sperm count. Lifestyle factors matter too: heat exposure (laptops on the lap, hot tubs, tight underwear), heavy alcohol use, smoking, and obesity all independently suppress sperm production. Supplements work best when the basics are covered first.