The most effective way to boost your fertility is to combine several lifestyle changes at once: eat well, time intercourse correctly, maintain a healthy weight, cut back on alcohol, and reduce exposure to common household chemicals that interfere with hormones. None of these steps works magic on its own, but together they meaningfully shift the odds in your favor. A woman in her early to mid-20s has roughly a 25 to 30% chance of conceiving in any given month. By 40, that drops to about 5%. Wherever you fall on that spectrum, the strategies below apply to both partners and can make a real difference.
Time Intercourse to Your Fertile Window
Your fertile window is the six-day stretch ending on the day you ovulate. Having sex every one to two days during that window gives you the highest pregnancy rates, though two to three times per week throughout your cycle gets you close to the same result. If you want to pinpoint your window more precisely, ovulation predictor kits (which detect a hormone surge in urine) and cervical mucus tracking both work well. Cervical mucus that looks and feels like raw egg whites is a reliable signal that ovulation is near.
Nutrition That Supports Egg and Sperm Quality
Start taking at least 400 micrograms of folic acid daily. The CDC recommends this for all women capable of becoming pregnant, and the American Society for Reproductive Medicine echoes it as a baseline for anyone trying to conceive. Folic acid is critical during the earliest days of pregnancy because it helps the neural tube, which becomes the brain and spine, develop properly. It’s the only form of folate proven to prevent neural tube defects. If you’ve had a previous pregnancy affected by a neural tube defect, the recommended dose jumps to 4,000 micrograms daily.
For the male partner, zinc and selenium deserve attention. Zinc concentration in seminal fluid correlates with sperm count, motility, and the percentage of normally shaped sperm. The recommended daily intake for men is about 14 mg, with an upper limit of 40 mg. Selenium, at a dose of around 200 micrograms per day, has been shown in a randomized trial to improve total sperm count, concentration, motility, and normal shape after 26 weeks of supplementation. But more is not better here: doses above 400 micrograms per day can actually reduce sperm motility in fertile men. Stick to the recommended range of about 70 micrograms from food, and only supplement under guidance.
Coenzyme Q10 (CoQ10) is worth considering, especially for women over 35. Eggs contain more energy-producing structures (mitochondria) than nearly any other cell in the body because egg development and early embryo growth are extremely energy-intensive. CoQ10 supports that energy production and protects cells from oxidative damage. Many reproductive endocrinologists recommend 300 to 600 mg daily, started at least 8 to 12 weeks before trying to conceive. That timeline matters because eggs take roughly 90 days to mature before ovulation, so you want mitochondrial support in place during that entire developmental window.
Why Weight Matters More Than You Think
Body weight has a surprisingly precise relationship with fertility outcomes. A large study of IVF cycles found that a BMI of 23 to 24.99 was associated with the highest probability of both clinical pregnancy and live birth. Deviations in either direction reduced those odds: being underweight (BMI under 18.5) lowered the chance of a live birth by 11%, while class I obesity reduced it by 9%, class II obesity by 15%, and class III obesity by 27%. Even the overweight range (BMI 25 to 29.99) showed a 4% reduction.
These numbers come from IVF data, but the underlying biology applies to natural conception too. Excess body fat increases estrogen production, which can disrupt ovulation. Too little body fat can suppress it entirely. If your weight is significantly outside the normal range, even a modest shift of 5 to 10% of body weight in the right direction can restore more regular ovulation.
Alcohol, Caffeine, and Smoking
Alcohol has a clear, dose-dependent effect on fertility. Women who drink more than seven alcoholic drinks per week are about 7% less likely to conceive. When the male partner drinks at that level, the chance of a live birth drops by 9%. The ASRM recommends limiting alcohol to minimal or moderate use while trying to conceive, which practically means a few drinks per week at most.
Caffeine, interestingly, gets a pass. A Harvard study of couples undergoing fertility treatment found that caffeine consumption by either partner did not affect the odds of pregnancy or live birth. That said, most guidelines still suggest keeping intake moderate, around two to three cups of coffee per day, as a reasonable precaution.
Smoking is a different story. Both the ASRM and virtually every fertility organization strongly discourage it for both partners. Smoking damages egg and sperm DNA, reduces ovarian reserve, and increases the risk of miscarriage. Recreational drugs carry similar risks and should be avoided entirely.
Reduce Your Exposure to Hormone-Disrupting Chemicals
Endocrine-disrupting chemicals are found in food containers, personal care products, cosmetics, pesticides, and household plastics. The most studied culprits, phthalates and bisphenol A (BPA), mimic estrogen in the body and bind to hormone receptors. This interference can alter the timing of ovulation by disrupting the release of luteinizing hormone, the signal that triggers egg release. These chemicals also cause oxidative stress in ovarian tissue, which damages developing follicles and reduces both the number and quality of eggs. In men, similar disruptions affect sperm production and quality.
Practical steps to reduce exposure include switching to glass or stainless steel food containers, avoiding heating food in plastic, choosing fragrance-free personal care products, and eating organic produce when possible. You won’t eliminate exposure entirely, but reducing the daily load helps, especially during the months you’re actively trying to conceive.
Give Lifestyle Changes Time to Work
Eggs take about 90 days to mature before ovulation. Sperm take roughly 72 days to develop from start to finish. That means any changes you or your partner make today won’t fully show up in egg or sperm quality for about three months. This is an important reason to start optimizing your habits well before you begin trying, or as soon as possible if you’ve already started. Men who make lifestyle changes can generally expect improvements in sperm quality after about three months.
When to Seek Help
If you’re under 35 and have been trying for 12 months without success, it’s time for a fertility evaluation. If you’re 35 or older, that timeline shortens to 6 months. Women over 40 may warrant more immediate evaluation. And regardless of age, if you have a known medical condition associated with infertility, such as endometriosis, polycystic ovary syndrome, or a history of pelvic surgery, evaluation should start right away rather than waiting for a set number of months to pass.