Fertility Supplements: Honest Evidence Ratings
The fertility supplement market is enormous and largely misleading. This guide rates every common supplement by clinical evidence quality.
⭐⭐⭐⭐⭐ Non-Negotiable: Take These
Folic Acid / Methylfolate (400–800mcg daily) Start at least 1 month (ideally 3 months) before conception. Reduces neural tube defect risk (spina bifida, anencephaly) by 70%. Also supports cell division and DNA synthesis. The most evidence-supported pre-conception supplement in reproductive medicine. Women with MTHFR gene variants may absorb methylfolate (L-methyltetrahydrofolate) better.
⭐⭐⭐⭐ Strong Evidence — Recommended If Indicated
Vitamin D (1000–2000 IU daily if deficient) Multiple studies show Vitamin D deficiency (<20 ng/mL) significantly reduces IVF live birth rates. A 2014 JCEM meta-analysis found women with sufficient Vitamin D had significantly higher IVF pregnancy rates. The majority of Indians are deficient. Test first (serum 25(OH)D); supplement if below 30 ng/mL.
Myo-Inositol (4g daily — PCOS) Endorsed by ASRM/ESHRE PCOS 2023 guideline. Multiple RCTs show: restores ovulation in 50–65% of anovulatory PCOS; reduces testosterone; improves egg quality in IVF. Dose: 4g myo-inositol + 400mg D-chiro-inositol. Not specifically evidenced for non-PCOS subfertility.
CoQ10 Ubiquinol (200–600mg daily) Mitochondrial antioxidant essential for egg maturation energy. Two RCTs (Giannubilo 2018, Xu 2019) showed improved blastocyst rates and IVF outcomes in women over 37 with diminished ovarian reserve. 2019 meta-analysis showed significant sperm motility improvement in men. Use ubiquinol form (significantly better absorbed than ubiquinone). Minimum 3 months.
Omega-3 DHA (1000–2000mg daily) DHA is concentrated in follicular fluid and essential for egg maturation and embryo development. Observational studies consistently show better IVF outcomes with higher omega-3 status. Safe through conception and pregnancy. Algal omega-3 is equivalent to fish oil.
Zinc (66mg daily — men) Essential for spermatogenesis. Deficiency significantly reduces sperm count and testosterone. Multiple trials show count and motility improvement in zinc-deficient men.
L-Carnitine (2g daily — men with poor motility) Multiple RCTs show significant sperm motility improvement. L-carnitine directly supports fatty acid oxidation in the sperm midpiece — the energy source powering the tail.
⭐⭐⭐ Moderate Evidence — Worth Considering
DHEA (25–75mg daily — poor ovarian responders only) Evidence for improving ovarian response and IVF outcomes specifically in women with DOR who respond poorly to stimulation. Critical caution: DHEA is a steroid hormone precursor. Can cause acne, hirsutism, hormonal disruption. Should ONLY be taken under specialist supervision for a specific clinical indication. Women with PCOS must not take DHEA (they already have elevated androgens).
Selenium (100–200mcg daily) Antioxidant cofactor. Associated with improved sperm motility and reduced oxidative stress in eggs. Avoid excess (>400mcg/day is toxic).
Vitamin E (400 IU daily) Antioxidant. Moderate evidence for male fertility (morphology improvement). Part of most male fertility supplement formulations.
Melatonin (3mg at bedtime, during IVF only) Melatonin is present in follicular fluid and protects eggs during the LH surge. Small RCTs show improved fertilisation rates and embryo quality. Only take during IVF stimulation after guidance from your fertility team.
⭐⭐ Limited Evidence — Do Not Rely On
Vitex (Chasteberry): Low-quality studies suggest possible benefit for luteal phase deficiency. Insufficient for routine recommendation. May interact with hormonal medications.
Royal Jelly: No adequate RCT evidence for human fertility.
Evening Primrose Oil: Some use for cervical mucus — very limited evidence. Stop after ovulation.
Ashwagandha (KSM-66 600mg): Best herbal option for men — reasonable evidence for sperm motility and stress reduction. Limited female fertility evidence.
The Practical Protocol
Women trying to conceive naturally: Essential: Folic acid 400–800mcg Add if applicable: Vitamin D (if deficient), CoQ10 200mg (especially >35), Omega-3 DHA 1000mg, Inositol 4g (if PCOS)
Men (3-month course before IVF): CoQ10 200–400mg, Zinc 66mg, L-carnitine 2g, Selenium 100mcg, Vitamin C 500mg + E 200IU
Avoid: High-dose Vitamin A (teratogenic); excess zinc/selenium; anything "boosting testosterone" when fertility is the goal; DHEA without specialist supervision.
Reference: ASRM 2022 — Nutritional Supplements and Natural Products. ESHRE 2023 — Lifestyle and Supplements.
Frequently Asked Questions
Which fertility supplements actually work?▾
With strong-to-moderate evidence: folic acid (essential — reduces neural tube defects), Vitamin D (correct deficiency before IVF), CoQ10 ubiquinol (egg quality over 35; sperm motility in men), myo-inositol (PCOS specifically), omega-3 DHA (egg quality), zinc and L-carnitine (men — count and motility). Most other supplements have insufficient evidence or are actively harmful in excess.
Should I take CoQ10 for fertility?▾
CoQ10 ubiquinol (200–600mg daily) has moderate evidence for improving egg quality — particularly for women over 35 or with diminished ovarian reserve. Two RCTs showed improved IVF outcomes. For men, it improves sperm motility. Takes 3 months minimum. Ubiquinol form is significantly better absorbed than ubiquinone.
Is DHEA safe to take for fertility?▾
DHEA has moderate evidence for poor ovarian responders — women with confirmed diminished ovarian reserve who respond poorly to IVF stimulation. It is NOT appropriate for general use. DHEA is a steroid hormone precursor that can cause acne, hirsutism, and hormonal disruption. Only take under specialist supervision for a specific clinical indication. Women with PCOS must not take DHEA.