Regular ovulation depends on a chain of hormonal signals, body composition, and daily habits that you can influence more than you might expect. Whether you’re dealing with irregular cycles or simply want to optimize your fertility, the steps that matter most come down to keeping your weight in a specific range, adjusting what you eat, timing intercourse around your fertile window, and knowing when medication might help.
How Ovulation Works
Your brain releases two key hormones that drive your menstrual cycle. The first, FSH, stimulates follicles in your ovaries to grow and produce estrogen. As estrogen rises, it eventually triggers a surge of the second hormone, LH. That LH surge is the final signal that causes a mature egg to release from the follicle, typically 24 to 36 hours later. Anything that disrupts this hormonal sequence, from stress to insulin resistance to extreme body weight, can delay or prevent ovulation entirely.
Get Your Weight Into the Fertile Range
Body weight is one of the strongest predictors of regular ovulation. A BMI between 19 and 24 is associated with the most consistent cycles. Being underweight (BMI of 18.5 or less) often causes irregular periods and can stop ovulation altogether, because the body reads low energy reserves as a signal that it’s not safe to sustain a pregnancy. On the other end, a BMI in the obese range (30 or higher) also disrupts ovulation, largely through insulin resistance and excess estrogen produced by fat tissue.
You don’t necessarily need to hit a “perfect” number. Even modest weight changes, losing 5 to 10 percent of body weight if you’re overweight, or gaining a few pounds if you’re underweight, can be enough to restart ovulation in many cases. The goal is moving toward that 19 to 24 range, not reaching it overnight.
Adjust Your Diet for Ovulatory Health
The total amount of fat you eat doesn’t appear to affect ovulation much, and neither do saturated or monounsaturated fats specifically. Trans fats are the exception. As little as 4 grams of trans fats per day is strongly linked with increased risk of ovulatory infertility. Trans fats show up in some fried foods, packaged baked goods, and anything listing “partially hydrogenated oil” on the label. Cutting these out is one of the simplest dietary changes you can make.
Protein source matters too. Women eating more than 100 grams of protein per day were more likely to report ovulatory problems than those eating around 77 grams. The type of protein made an even bigger difference: ovulatory infertility was nearly 40 percent more likely in women with the highest intakes of animal protein. Swapping some of that animal protein for plant sources like nuts, legumes, soybeans, and tofu appears to offer modest protection against ovulatory dysfunction.
Consider Myo-Inositol if You Have PCOS
Polycystic ovary syndrome is the most common cause of irregular ovulation, and it’s closely tied to how your body handles insulin. Myo-inositol is a supplement that improves insulin signaling in the ovaries, and clinical evidence supports using it to restore ovulation in women with PCOS. The Society of Obstetricians and Gynaecologists of Canada recommends a dose of 4 grams daily, split into two 2-gram doses morning and evening.
For best results, the research points to combining myo-inositol with a small amount of D-chiro-inositol in a 40:1 ratio, meaning 4 grams of myo-inositol alongside about 100 milligrams of D-chiro-inositol. Many combination supplements are already formulated this way. Myo-inositol is not a quick fix. Most studies evaluate its effects over two to three months of consistent use.
Track Your Fertile Window
Even if you’re ovulating regularly, timing makes a huge difference. An egg survives only about 12 to 24 hours after release, so your best chances come from having sperm already present when ovulation happens. Sperm can survive several days inside the reproductive tract, which means the five days before ovulation and the day of ovulation itself are your fertile window.
Two practical ways to identify that window:
- Ovulation predictor kits (OPKs): These urine tests detect the LH surge that happens 24 to 36 hours before you ovulate. A positive result means you should have intercourse that day and the next.
- Cervical mucus monitoring: As you approach ovulation, your cervical mucus becomes slippery, stretchy, and clear, often compared to raw egg whites. This type of mucus helps sperm travel more easily. When you notice this change, you’re in or approaching your most fertile days.
Using both methods together gives you the best read on your timing. If your cycles are irregular, start testing with OPKs earlier than the package suggests, around day 8 or 9, to avoid missing a surge.
When Medication Can Help
If lifestyle changes and supplements haven’t restored regular ovulation after several months, ovulation-inducing medications are the next step. The 2023 international evidence-based guidelines from ASRM recommend letrozole as the first-line medication for women with PCOS who aren’t ovulating. In a large NIH study of women with PCOS, letrozole produced ovulation in 61.7 percent of cycles compared to 48.3 percent with the older standard, clomiphene. Live birth rates were also higher: 27.5 percent with letrozole versus 19.1 percent with clomiphene.
Both medications are taken by mouth for five days early in the cycle, and treatment typically continues for up to five cycles. Letrozole works by temporarily lowering estrogen, which prompts the brain to release more FSH and stimulate follicle growth. Clomiphene works through a different mechanism but targets the same hormonal chain. Your doctor will determine which is appropriate based on your specific situation.
The Role of Metformin
For women with PCOS and insulin resistance, metformin can be added alongside other treatments. A Cochrane review found that adding metformin to hormone injections more than doubled the odds of a live birth compared to hormone injections alone. If the baseline chance of a live birth was 27 percent, adding metformin pushed that to somewhere between 32 and 60 percent. Metformin works by improving how your body responds to insulin, which in turn lowers the excess androgen levels that interfere with follicle development.
Other Habits That Support Ovulation
Chronic stress elevates cortisol, which can suppress the hormonal signals from your brain that trigger ovulation. You don’t need to eliminate all stress, but sustained high stress over weeks and months is worth addressing through whatever works for you, whether that’s exercise, sleep, or reducing specific stressors in your life.
Exercise itself has a U-shaped relationship with ovulation. Moderate activity supports healthy cycles, but extremely intense or prolonged exercise (common in competitive athletes) can shut ovulation down, a condition sometimes called hypothalamic amenorrhea. If you’re training hard and your periods have disappeared or become irregular, dialing back intensity or increasing caloric intake is often enough to bring ovulation back.
Alcohol and smoking both impair ovulatory function. Smoking accelerates the loss of eggs in the ovaries, and even moderate alcohol intake has been associated with longer time to conception. Neither needs to be zero to ovulate, but reducing both improves your odds.