If you’re not ovulating regularly, the fix depends on what’s disrupting your cycle. For many people, changes to diet, weight, exercise, or stress levels are enough to restart ovulation on their own. Others need medication, which works well: first-line fertility drugs trigger ovulation in roughly 60 to 87% of cycles for people with common conditions like PCOS. The key is figuring out what’s getting in the way, then targeting that specific barrier.
How Ovulation Works (Briefly)
Ovulation happens when a surge of luteinizing hormone (LH) triggers a mature follicle in your ovary to release an egg. This LH surge kicks off the process about 36 to 40 hours before the egg is actually released. Home ovulation predictor kits detect LH building up in your urine, and once the test turns positive, ovulation typically follows within 12 to 24 hours.
Anything that disrupts this hormonal chain, whether it’s a signaling problem in the brain, excess insulin, too little body fat, or chronic stress, can prevent the surge from happening at all. That’s called anovulation, and it’s one of the most common causes of difficulty getting pregnant.
Weight Loss Can Restart Ovulation
Carrying extra weight is one of the most straightforward barriers to regular ovulation, particularly if you have PCOS. Excess body fat increases insulin resistance, which in turn raises levels of hormones that interfere with follicle development. The good news is that you don’t need to reach an “ideal” weight to see a difference. Losing just 5 to 10% of your body weight is often enough to restore normal reproductive function. For someone weighing 200 pounds, that’s 10 to 20 pounds.
The type of diet matters too. In a year-long study of overweight women with PCOS, those who followed a low-glycemic-index diet (one that limits blood sugar spikes) saw significantly better menstrual regularity than women eating a standard healthy diet: 95% improved their cycle patterns compared to 63% in the conventional diet group. Swapping refined carbs for whole grains, legumes, and non-starchy vegetables is a practical way to lower your diet’s glycemic impact without overhauling everything you eat.
Exercise: The Sweet Spot
Moderate physical activity supports ovulation by improving insulin sensitivity and reducing inflammation. But there’s a tipping point. Too much intense exercise, especially when paired with inadequate calorie intake, can shut down ovulation entirely through a condition called functional hypothalamic amenorrhea (FHA). This happens because your brain interprets the combination of high energy expenditure and low fuel as a signal that conditions aren’t safe for pregnancy, so it dials down the hormones that trigger ovulation.
Research shows that women with FHA have a dramatically heightened stress hormone response to exercise: their cortisol levels spike about 92% above baseline during a workout compared to 62% in women with normal cycles. Their blood sugar also drops progressively during exercise, while it stays stable in women who are ovulating normally. This suggests the issue isn’t just exercise volume but the mismatch between how much energy you’re burning and how much you’re taking in. If your periods have disappeared alongside a heavy training schedule, eating more (not necessarily exercising less) is often the first step toward getting ovulation back.
Supplements That Have Evidence
Myo-inositol is the most studied supplement for ovulation support, particularly for PCOS. It works by improving how your cells respond to insulin, which lowers the excess androgen levels that block follicle development. The Society of Obstetricians and Gynaecologists of Canada recognizes a dose of 4 grams of myo-inositol daily as effective for restoring ovulation in women with PCOS. Many products combine it with a small amount of D-chiro-inositol in a 40:1 ratio (4 grams of myo-inositol plus 100 milligrams of D-chiro-inositol), which clinical evidence suggests is the optimal balance.
Myo-inositol isn’t a quick fix. Most studies showing benefit ran for three to six months, so consistency matters. It’s also most effective in the context of PCOS. If your anovulation has a different cause, such as hypothalamic amenorrhea or a thyroid issue, inositol is unlikely to help.
Prescription Medications for Ovulation
When lifestyle changes and supplements aren’t enough, ovulation-inducing medications are the standard next step. These are taken as pills for five days early in your cycle, and they work by nudging your body to develop and release a mature egg.
Two medications are commonly prescribed. In a large NIH-funded trial of women with PCOS, letrozole produced a cumulative ovulation rate of 61.7% compared to 48.3% for clomiphene. The difference in live birth rates was even more striking: 27.5% of women on letrozole had a baby versus 19.1% on clomiphene. A separate study found pregnancy rates of 21.6% with letrozole compared to 7.8% with clomiphene. Because of this consistent advantage, letrozole has become the preferred first-line option for PCOS-related anovulation at many fertility clinics.
After finishing the five-day course, ovulation typically occurs 5 to 12 days later. Your provider will likely recommend having intercourse starting about five days after your last pill, every other day for a week, to cover the fertile window. Some clinics monitor your response with ultrasound to confirm a follicle is developing and to time things more precisely.
How to Confirm You’re Ovulating
Tracking whether these interventions are actually working requires some form of monitoring. The simplest approach is basal body temperature charting: you take your temperature first thing every morning before getting out of bed. After ovulation, your temperature rises by 0.4 to 1.0°F and stays elevated. When you see at least three consecutive days of higher temperatures, you can be reasonably confident ovulation occurred. The catch is that this method only confirms ovulation after the fact, so it’s more useful for verifying a pattern over several cycles than for timing intercourse in the moment.
Ovulation predictor kits (OPKs) are more useful for real-time planning. They detect the LH surge in your urine before ovulation happens, giving you a roughly 12-to-24-hour heads-up. Using both methods together gives you the clearest picture: OPKs tell you when ovulation is about to happen, and temperature tracking confirms it did.
Common Causes Worth Ruling Out
Before trying to force ovulation with supplements or medication, it helps to know why it’s not happening. PCOS is the most common culprit, accounting for the majority of anovulation cases in reproductive-age women. But thyroid disorders (both overactive and underactive) can also suppress ovulation, and they’re easily treated once identified. High prolactin levels, caused by stress, certain medications, or a small benign pituitary growth, are another treatable cause.
If you’re under 35, haven’t been ovulating, and have been trying to conceive for 12 months (or 6 months if you’re over 35), a basic fertility workup involving blood tests on specific cycle days and possibly an ultrasound can identify the underlying issue. Knowing the cause determines which of the strategies above will actually work for you, rather than guessing.