There’s no single pill that guarantees a fast pregnancy, but several supplements, medications, and lifestyle strategies have solid evidence behind them for improving your odds each cycle. A healthy woman in her early to mid-20s has about a 25–30% chance of conceiving in any given month. By age 40, that drops to around 5%. The goal of everything below is to push your per-cycle probability as high as it can go.
Folic Acid: The Non-Negotiable Starting Point
Every woman trying to conceive should be taking 400 mcg of folic acid daily, ideally starting at least one month before conception. This isn’t about boosting fertility directly. It protects against neural tube defects in the earliest days of pregnancy, often before you even know you’re pregnant. If you’ve had a previous pregnancy affected by a neural tube defect, the recommended dose jumps to 4,000 mcg daily. Most prenatal vitamins contain the standard 400 mcg, so starting a prenatal now covers this base and adds iron, calcium, and other nutrients your body will need.
Vitamin D and Fertility
Low vitamin D levels are linked to lower pregnancy rates. In one study of women undergoing IVF, those who became pregnant had significantly higher preconception vitamin D levels than those who didn’t. Specifically, having a sufficient vitamin D level (at or above 50 nmol/L, roughly 20 ng/mL) was associated with meaningfully better odds of a successful pregnancy. Many people are deficient without knowing it, especially if you live in a northern climate or spend most of your time indoors. A simple blood test from your doctor can tell you where you stand, and supplementation is cheap and widely available.
CoQ10 for Egg Quality (Especially Over 35)
Coenzyme Q10 is a supplement that helps cells produce energy, and egg cells are among the most energy-demanding cells in the body. In a study published in Fertility and Sterility, CoQ10 significantly improved oocyte maturation rates in women aged 38–46 (82.6% vs. 63.0%) and nearly cut the rate of chromosomal abnormalities in half (36.8% vs. 65.5%). For women 30 and under, the study found no measurable benefit, suggesting that younger eggs already have sufficient energy reserves. If you’re in your mid-to-late 30s or older and trying to conceive, CoQ10 is one of the better-supported supplements for egg quality.
Myo-Inositol if You Have PCOS
Polycystic ovary syndrome is one of the most common causes of irregular ovulation, and if you’re not ovulating regularly, timing intercourse becomes a guessing game. Myo-inositol at a dose of 4 grams daily has been shown to improve insulin sensitivity, restore menstrual cycle regularity, and promote ovulation in women with PCOS. The Society of Obstetricians and Gynaecologists of Canada found it was actually superior to metformin (a commonly prescribed medication) for regulating menstrual cycles.
The optimal formulation appears to be myo-inositol combined with D-chiro-inositol in a 40:1 ratio, so 4 grams of myo-inositol plus 100 mg of D-chiro-inositol. This combination helps rebalance the hormonal disruption that prevents ovulation in PCOS. If you don’t have PCOS, this supplement is unlikely to offer much benefit.
Guaifenesin: A Surprising OTC Option
Guaifenesin, the active ingredient in many over-the-counter cough medicines like Mucinex, works by thinning mucus throughout the body. That includes cervical mucus, which sperm need to swim through to reach the egg. In a small study of 40 couples with at least one year of infertility related to cervical factors, two-thirds of patients showed marked improvement in cervical mucus quality after taking guaifenesin. Pregnancy rates reached 33% within two to three cycles.
The protocol involves taking it for five days before expected ovulation and continuing through ovulation day. If you’ve noticed that you rarely produce the slippery, egg-white cervical mucus that typically appears around ovulation, this is an inexpensive option worth trying. Make sure you choose a product that contains only guaifenesin, not one combined with antihistamines or decongestants, which can actually dry up cervical mucus.
What Your Partner Can Take
Fertility is a two-person equation, and roughly a third of conception difficulties involve male factors. Zinc is one of the most well-studied nutrients for male reproductive health. Research in the American Journal of Clinical Nutrition found that even short-term zinc depletion in young men decreased semen volume and lowered testosterone levels. Men consuming adequate zinc (around 10 mg daily) had notably higher semen volume (3.30 mL vs. 2.24 mL) and higher serum testosterone compared to those on a zinc-restricted diet.
Good dietary sources include oysters, red meat, poultry, beans, and nuts. A basic men’s multivitamin or a standalone zinc supplement can fill gaps if your partner’s diet falls short. Other commonly recommended nutrients for sperm health include selenium, vitamin C, and vitamin E, though zinc has the strongest direct evidence.
Timing Intercourse Around Ovulation
No supplement matters much if the timing is off. About 36 hours before ovulation, your body releases a surge of luteinizing hormone (LH), which is what at-home ovulation predictor kits detect. Once you get a positive LH test, that’s the signal to have sex every other day until ovulation has passed. Sperm can survive in the reproductive tract for up to five days, but the egg only lives for 12–24 hours after release, so the days leading up to ovulation are actually more fertile than the day after.
If you don’t want to use ovulation kits, having sex every two to three days throughout your cycle ensures sperm are present whenever ovulation occurs. But for people specifically trying to conceive quickly, tracking your LH surge removes the guesswork.
Prescription Medications That Induce Ovulation
If you’ve been trying for several months without success, or if you know you have irregular cycles, prescription fertility medications can significantly improve your chances. The two most commonly prescribed are clomiphene (Clomid) and letrozole (Femara). Both work by tricking your brain into producing more of the hormones that trigger ovulation, but through different mechanisms.
For women with PCOS, letrozole tends to outperform clomiphene. In a large trial, 27.5% of women on letrozole achieved a live birth compared to 19.1% on clomiphene. For unexplained infertility, the results are closer: clomiphene produced a 23% live birth rate versus 19% for letrozole. Your doctor can help determine which is more appropriate based on your specific situation.
When the Timeline Matters
How long you should try before seeking help depends on your age. The American Society for Reproductive Medicine recommends that women under 35 seek evaluation after 12 months of trying, while women 35 and older should seek evaluation after just 6 months. Women over 40 may benefit from more immediate evaluation.
Certain situations warrant skipping the waiting period entirely: irregular or absent periods, cycles shorter than 25 days, a history of endometriosis, known uterine or tubal problems, suspected male fertility issues, or prior exposure to chemotherapy or radiation. If any of these apply, getting evaluated sooner rather than later can save valuable time.