Fertility Supplements for Women: What Actually Works

Why is supplement evidence in fertility hard to evaluate?

Most fertility supplement trials are small, short, and funded by supplement manufacturers. Live birth rate — the outcome that ultimately matters — is rarely the primary endpoint. Surrogate markers like antral follicle count or sperm motility improve more easily and do not always translate to higher pregnancy rates. This is not a reason to dismiss all supplement research, but it is a reason to read headlines cautiously.

Does CoQ10 improve egg quality?

Coenzyme Q10 (CoQ10) is an antioxidant involved in mitochondrial energy production. Egg cells (oocytes) require substantial mitochondrial energy during maturation, and CoQ10 levels in follicular fluid decline with age. A randomized controlled trial in women with diminished ovarian reserve undergoing IVF/ICSI found that pretreatment with CoQ10 for 60 days significantly increased the number of retrieved oocytes, improved fertilization rate, and produced more high-quality embryos compared with controls — with lower gonadotrophin requirements 1Ref 1Xu Y, Nisenblat V, Lu C, Li R, Qiao J, Zhen X, Wang S (2018).Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women with decreased ovarian reserve: a randomized controlled trial.CoQ10 pretreatment for 60 days significantly increased oocyte yield, fertilization rate, and high-quality embryos in women with diminished ovarian reserve undergoing IVF/ICSI.

The evidence is genuinely interesting but not definitive — most trials are small and have not reported live birth as a primary outcome. Reproductive endocrinologists frequently recommend CoQ10 for women with diminished ovarian reserve or age-related concerns, typically in the range of 400–600 mg/day taken for at least 60 days before a retrieval, though dosing is not standardized. This is a supplement to discuss with a reproductive specialist, not one to start without a conversation about your specific situation.

What about myo-inositol?

Inositol — particularly myo-inositol, sometimes combined with D-chiro-inositol — has the most evidence among supplements for women with PCOS. Inositol is a sugar alcohol involved in insulin signaling, and PCOS frequently involves insulin resistance. A 2024 systematic review and meta-analysis conducted to inform the 2023 International Evidence-based PCOS Guidelines found that inositol can improve menstrual cycle regularity and androgen levels in women with PCOS, though the authors noted that evidence for improving live birth rates specifically was limited 2Ref 2Fitz V, Graca S, Mahalingaiah S, Liu J, et al. (2024).Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS Guidelines.Inositol evidence in PCOS: improves menstrual cycle regularity and androgen levels; limited evidence for live birth improvement; supports use as a low-risk option for PCOS.

For women with PCOS preparing for ovulation induction or IVF, inositol is a reasonable, low-risk option to discuss with a reproductive endocrinologist. For women without insulin resistance or PCOS, the evidence is less clear.

Is DHEA useful?

Dehydroepiandrosterone (DHEA) is an adrenal hormone that serves as a precursor to both estrogen and testosterone. Some fertility centers, particularly for women with low ovarian reserve (low AMH or low antral follicle count), have used DHEA supplementation as a strategy to improve response to ovarian stimulation. The evidence base is mixed — some studies show improvement in oocyte yield and embryo quality; others do not show a benefit.

DHEA is a hormone, not a benign vitamin, and can have side effects including acne, hair changes, and mood effects. It should not be taken without direct involvement of a reproductive endocrinologist who has reviewed your hormone profile.

What about vitamin D?

Vitamin D receptors are present in reproductive tissue, and insufficiency is common. Some observational studies have associated low vitamin D levels with lower IVF success rates, but vitamin D supplementation trials have not consistently improved pregnancy outcomes. Correcting a documented deficiency is reasonable on general health grounds; supplementing aggressively without knowing your level is not well-supported by evidence 3Ref 3Teede HJ, Tay CT, Laven JJE, Dokras A, et al. (2023).Recommendations From the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome.2023 PCOS international guideline context; evidence-based recommendations for managing PCOS including insulin sensitization and lifestyle approaches.

A simple blood test (25-OH vitamin D) can tell you whether you are deficient. If you are, your clinician can recommend an appropriate repletion dose.

Folate and prenatal vitamins: the non-negotiable

Among preconception supplements, folate (or its more bioavailable form, methylfolate) has the strongest and most consistent evidence. It reduces the risk of neural tube defects, which form in the first weeks of pregnancy. The U.S. Preventive Services Task Force gives folic acid supplementation for persons planning to become pregnant a Grade A recommendation — its highest rating 4Ref 4US Preventive Services Task Force (2023).Folic Acid Supplementation to Prevent Neural Tube Defects: US Preventive Services Task Force Reaffirmation Recommendation Statement.Grade A recommendation for daily folic acid (0.4–0.8 mg) for persons planning to become pregnant, starting at least one month before conception.

A prenatal vitamin containing adequate folic acid is recommended for anyone trying to conceive. Prenatal vitamins also typically contain iodine (important for thyroid function and fetal brain development), iron, and other micronutrients. Starting a prenatal vitamin one to three months before attempting conception is a reasonable standard.

What supplements are not well-supported?

Many products marketed specifically for fertility — royal jelly, FertilAid, assorted 'fertility blends' — have minimal or no rigorous clinical trial data. This does not mean they are harmful, but it does mean their benefit is unproven. The supplement industry is not regulated as strictly as pharmaceuticals, and product quality varies substantially. If you choose to use a supplement, look for products that have been independently verified for content accuracy (NSF, USP, or ConsumerLab certification).