Most lifestyle changes that improve sperm count take about two to three months to show up on a semen analysis. That’s because sperm take roughly 64 days to fully develop, so whatever you do today won’t be reflected in your numbers until the next cycle of sperm matures. The good news: the factors you can control, from diet to exercise to temperature exposure, have a meaningful impact on both sperm count and quality.
A normal total sperm count is 39 million or more per ejaculate. If yours is below that, or if you’re simply trying to optimize before trying to conceive, the strategies below are backed by the strongest available evidence.
Eat More Like the Mediterranean
The single dietary pattern with the most evidence behind it for sperm health is the Mediterranean diet: heavy on vegetables, fruits, legumes, whole grains, fish, nuts, and olive oil, with limited red meat and processed food. Men who follow this pattern consistently show higher sperm concentration, higher total sperm count, better motility, and less DNA damage in their sperm. The likely reason is that these foods are packed with antioxidants and anti-inflammatory compounds that protect developing sperm cells from oxidative damage.
A few specifics stand out. Omega-3 fatty acids, found in fish and walnuts, are linked to higher total sperm count, better motility, and improved sperm shape. In the FERTINUTS trial, healthy young men who added 60 grams of mixed nuts (walnuts, hazelnuts, almonds) to their daily diet for 14 weeks saw meaningful improvements in total sperm count, motility, and sperm shape compared to a control group. Dark leafy greens supply folate, which plays a direct role in sperm production and DNA synthesis.
One important caveat: despite years of popularity, zinc and folic acid supplements do not appear to help. A large, rigorous trial of 2,370 couples found that men taking zinc and folic acid daily for six months had no improvement in sperm count, motility, shape, or pregnancy rates compared to men taking a placebo.
Exercise Moderately, Not Excessively
Regular moderate exercise improves sperm count, motility, and shape. It works partly by improving hormonal balance: moderate activity supports healthy testosterone levels and reduces inflammation. Both resistance training and aerobic exercise appear beneficial, so the type matters less than the intensity.
The key word is “moderate.” Severe or excessive training can backfire. Overtraining increases stress hormones and generates enough oxidative stress to damage sperm cells and testicular tissue. If you’re training so hard that you’re constantly fatigued, sore, or losing weight unintentionally, you may be doing more harm than good. A balanced routine of several sessions per week, with adequate recovery, is the sweet spot.
Keep Your Testicles Cool
Your testicles hang outside your body for a reason: sperm production requires a temperature about 2 to 3°C below your core body temperature. Anything that heats that area for extended periods can suppress production.
The evidence is clearest for saunas and hot tubs. In one study, healthy men who used a sauna twice a week for three months had significantly impaired sperm count and motility by the end. The damage extended to sperm DNA integrity and cellular energy production. Occupations that involve prolonged sitting or heat exposure, like long-haul trucking and welding, are also associated with reduced sperm production.
Practical steps: limit time in hot tubs and saunas if you’re trying to conceive, avoid resting a laptop directly on your lap for long periods, and consider switching from tight underwear to looser-fitting boxers. These won’t guarantee higher numbers on their own, but removing unnecessary heat sources gives your body the conditions it needs.
Check Your Medications, Especially Testosterone
This catches many men off guard: taking supplemental testosterone almost always lowers sperm count, sometimes to zero. The logic is counterintuitive because testosterone is essential for sperm production, but the concentration needed inside the testicles is many times higher than what circulates in your blood. When you add testosterone from an outside source (injections, gels, patches), your brain detects the high blood levels and signals your testicles to stop producing it locally. Without that local production, sperm development shuts down.
If you’re on testosterone replacement therapy and want to preserve or restore fertility, talk to your prescribing doctor. The good news is that sperm count typically recovers within about three months of stopping, and no permanent damage is expected. But this is one of the most common and most reversible causes of severely low sperm counts in younger men.
Anabolic steroids work the same way. Any form of exogenous testosterone or related hormone will suppress your body’s own sperm production.
Consider Ashwagandha
Among herbal supplements, ashwagandha has some of the more promising clinical data. In a randomized, double-blind, placebo-controlled trial, men who took 300 mg of ashwagandha root extract twice daily saw a 38% increase in total sperm count and an 87% improvement in total sperm motility. These are notable numbers, though the study was conducted in healthy men, and results can vary. If you’re considering a supplement, ashwagandha is one of the few with this level of evidence behind it.
Prioritize Sleep
Sleep quality appears to matter for sperm production, though the data is less precise than for diet or heat exposure. In a prospective study of men’s sleep habits and semen quality, those who reported frequent trouble sleeping had sperm concentrations averaging nearly 8 million per milliliter lower than men who slept well. Total sperm counts were also lower. The associations were modest, and researchers noted they couldn’t pinpoint an exact ideal number of hours, but the overall trend was consistent: more sleep trouble correlated with worse semen quality.
Aiming for seven to eight hours of uninterrupted sleep is a reasonable target that aligns with broader health recommendations. If you have a diagnosed sleep disorder, treating it may benefit your fertility alongside everything else.
Alcohol, Smoking, and Cannabis
Heavy alcohol use and cigarette smoking both reduce sperm quality. Smoking increases oxidative stress throughout the body, and the testicles are particularly vulnerable. Cutting back or quitting both will help, and the benefits extend well beyond fertility.
Cannabis is a more complicated picture. Despite widespread claims that marijuana tanks sperm count, the evidence is surprisingly inconsistent. Studies in men attending fertility clinics have found either no clear association or mixed results between cannabis use and semen parameters like concentration, motility, and count. That doesn’t mean it’s harmless, but the data doesn’t support the same level of alarm as it does for tobacco or heavy drinking.
How Long Until You See Results
Because a full cycle of sperm development takes about 64 days, you should expect to wait at least two to three months before a repeat semen analysis reflects the changes you’ve made. That timeline applies to everything: dietary shifts, new exercise habits, stopping testosterone, or reducing heat exposure. If your doctor is monitoring your count, plan testing accordingly. Making multiple changes at once is fine and probably more effective than targeting one factor at a time, since most of these interventions work through different mechanisms.