Several lifestyle changes can meaningfully increase sperm count, and most of them come down to the basics: maintaining a healthy weight, staying moderately active, keeping your testicles cool, and giving your body the right nutrients. The World Health Organization considers a normal sperm concentration to be at least 16 million per milliliter, with a total count of 39 million or more per ejaculate. If you’re below those numbers, or just want to optimize, most improvements show up within two to three months, since the full cycle of sperm production takes roughly 42 to 76 days.
Lose Excess Weight
Obesity is one of the strongest modifiable risk factors for low sperm count. A meta-analysis of over 8,400 men found that those with obesity had sperm concentrations roughly 11 million per milliliter lower than men at a normal weight. The relationship was dose-dependent: the heavier the men were, the worse their numbers looked across concentration, total count, motility, and even sperm shape. Overweight men fell somewhere in between, though the difference from normal weight wasn’t always statistically significant.
Excess body fat disrupts the hormonal balance that drives sperm production. Fat tissue converts testosterone to estrogen, and the resulting hormonal shift directly suppresses the signals your brain sends to your testicles. Losing even a moderate amount of weight can begin to reverse this. If your BMI is above 30, bringing it down is likely the single highest-impact change you can make.
Exercise at the Right Intensity
Moderate to vigorous physical activity improves sperm concentration and total sperm count, but there’s a sweet spot. Research shows an inverse U-shaped relationship between exercise intensity and sperm quality: too little and too much are both problems. Men who exercised at moderate levels (roughly 600 to 3,000 MET-minutes per week) saw significant improvements in progressive sperm motility, with trends toward better shape as well. That range translates to something like 150 to 450 minutes of brisk walking per week, or proportionally less time doing more intense activities like running or cycling.
On both ends of the spectrum, results suffered. Men below 600 MET-minutes per week and those above 3,000 showed significantly worse sperm motility. If you’re training for a marathon or spending hours daily on intense exercise, you may want to scale back during the months you’re trying to conceive. Consistent moderate activity, like jogging, swimming, or resistance training several days a week, appears to be ideal.
Keep Your Testicles Cool
Sperm production requires a temperature slightly below core body temperature, which is why the testicles hang outside the body. Anything that heats them up can disrupt the process. Sitting with a laptop on your lap and your legs together raises scrotal temperature by more than 2°C on each side. Even using a lap pad underneath the computer doesn’t prevent this. The only things that help are sitting with your legs apart (which reduces the increase to about 1.4°C) and limiting how long you use a laptop in your lap.
The temperature rise begins fast. In one study, a 1°C increase was reached within just 11 minutes of sitting with legs closed and a laptop running. Other common heat sources include hot tubs, saunas, and prolonged hot baths. Tight-fitting underwear can contribute too, though the effect is smaller. If you’re actively trying to improve your count, switch to boxers, skip the hot tub, and move your laptop to a desk. Fever from illness can damage sperm DNA for up to 79 days afterward, so if you’ve been sick recently, give your body a full cycle to recover before worrying about test results.
Supplements That Have Evidence
Not every supplement marketed for male fertility actually works. A few stand out, and one popular combination has been definitively debunked.
Ashwagandha
This is one of the better-studied options. In a clinical trial, men with reduced fertility who took 675 mg daily of a concentrated root extract (split into three doses) for 12 weeks saw a 167% increase in sperm concentration, a 57% improvement in motility, and a 53% increase in semen volume. These are large effect sizes, though the study was conducted in men who had low baseline numbers, so the gains may be less dramatic if your starting count is closer to normal.
Coenzyme Q10
CoQ10 is an antioxidant your body produces naturally, and supplementing with it appears to improve total sperm count. A meta-analysis of randomized controlled trials found significantly higher total sperm counts in men taking CoQ10 compared to placebo. Typical study doses range from 200 to 400 mg daily, taken for three to six months. Some trials also showed improvements in motility and sperm shape, though not all found benefits for concentration specifically. CoQ10 is well-tolerated and widely available.
Zinc and Folic Acid: Skip This Combo
Despite being widely marketed for male fertility, zinc and folic acid supplements don’t work. A large NIH-funded trial of 2,370 couples found no difference in live birth rates (34% in the supplement group versus 35% with placebo), and no improvement in sperm count, motility, or shape. Worse, the men taking the supplements had higher rates of sperm DNA fragmentation, along with more gastrointestinal side effects like nausea, abdominal discomfort, and vomiting. Save your money on this one.
Vitamin D Matters
Vitamin D deficiency is common, and it correlates with lower sperm counts. Men with adequate vitamin D levels (above 30 ng/mL) had an average sperm concentration of 48 million per milliliter, compared to 35 million in men below that threshold. That’s a meaningful difference, especially if you’re borderline. A simple blood test can check your levels. If you’re deficient, correcting it through supplementation or sun exposure is a low-effort change with potential upside for both fertility and general health.
How Long Changes Take to Work
Sperm you ejaculate today started developing two to three months ago. The full production cycle takes approximately 42 to 76 days, with 74 days being the most commonly cited estimate. This means any change you make today, whether it’s losing weight, starting a supplement, or switching from briefs to boxers, won’t show up in a semen analysis for at least six weeks and more reliably after three months.
This timeline also means you shouldn’t panic over a single bad result. A high fever, a stressful period, or a temporary lifestyle change from months ago could explain a low count that has already started correcting itself. If you get concerning results on a semen analysis, most fertility specialists will recommend retesting after two to three months of consistent lifestyle optimization before moving to further intervention.