Best Supplements for Fertility — What to Take Before Trying to Conceive
The best supplements for fertility address the specific nutritional requirements of egg and sperm quality, uterine health, and hormonal regulation in the preconception period. The best supplements for fertility have evidence in reproductive populations specifically — not just general supplement benefit extrapolated to fertility. Starting 3-6 months before trying to conceive allows sufficient time for oocyte maturation cycles and sperm production cycles (approximately 90 days each) to reflect nutritional improvements.
Methylfolate — Non-Negotiable
Folate (B9) is the most evidence-backed preconception supplement — neural tube closure occurs within the first 28 days of pregnancy, often before pregnancy is confirmed. Standard folic acid at 400mcg daily is the NHS minimum recommendation. For women with MTHFR gene variants (affecting 30-40% of the population), methylfolate (5-MTHF at 400-800mcg) is more directly utilised. Either form significantly reduces neural tube defect risk — take for at least 4 weeks before conception and through the first trimester. A quality B complex provides folate alongside the other B vitamins that support cellular DNA synthesis and methylation.
CoQ10 — Egg and Sperm Quality
CoQ10 is essential for mitochondrial energy production — the cellular energy machinery in oocytes and sperm that drives fertilisation and early embryo development. Oocyte mitochondrial function declines with age from the early 30s. Multiple RCTs show CoQ10 supplementation (400-600mg ubiquinol daily for 3+ months) improves egg quality markers, fertilisation rates in IVF, and pregnancy rates in women over 35. CoQ10 ubiquinol at 200-400mg daily is the recommended form — ubiquinol is better absorbed than ubiquinone, particularly relevant over 35.
Vitamin D — Hormonal Regulation
Vitamin D receptors are present in the ovary, uterus, and testis. Deficiency is associated with lower fertility rates, reduced IVF success, and increased miscarriage risk. Vitamin D3 + K2 supplementation to achieve sufficiency (target 75-100 nmol/L) is a high-priority preconception intervention. Test first — supplementation dose should reflect baseline deficiency depth.
Omega-3 — Anti-Inflammatory and Uterine Health
Omega-3 fatty acids support uterine blood flow, reduce the inflammation that can impair implantation, and support early foetal neurodevelopment. DHA is specifically concentrated in the developing brain and retina. Omega-3 at 1,000-2,000mg EPA+DHA daily is appropriate for both partners preconceptionally, and for the pregnant person through pregnancy and breastfeeding.
Zinc — Male Fertility
Zinc is essential for sperm production, motility, and morphology. Deficiency reduces testosterone, impairs spermatogenesis, and increases sperm DNA fragmentation. For male fertility specifically, zinc bisglycinate at 15-25mg daily alongside CoQ10 (200mg ubiquinol) represents the best-evidenced male fertility supplement combination. Allow 90 days for sperm quality improvements to manifest (matching the spermatogenesis cycle).
Frequently Asked Questions
When should I start fertility supplements?
3-6 months before trying to conceive is ideal for most supplements — this allows full oocyte maturation cycles and sperm production cycles to reflect nutritional improvements. Folate/methylfolate should be started at minimum 4 weeks before conception, ideally 3 months before.
Do fertility supplements actually work?
For correcting deficiencies (vitamin D, zinc, folate): yes, with strong evidence. For mitochondrial support in women over 35 (CoQ10): yes, with moderate clinical evidence. As a universal fertility guarantee regardless of other factors: no. Supplements address nutritional contributions to fertility — they do not override structural, hormonal, or other medical causes of infertility.
Should men take fertility supplements too?
Yes — sperm quality is a significant factor in fertility outcomes (contributing to approximately 40-50% of infertility cases). CoQ10, zinc, vitamin D, and omega-3 all have evidence for improving sperm parameters in deficient or subfertile men.
Related Guides
Evidence-Based Health Guides
Practical Health Guides for Smarter Supplement Choices
Browse evidence-based guides, workbooks and free resources for supplement timing, forms, nutrient gaps, women’s health, energy and everyday performance.
- Methylfolate vs Folic Acid — Which Is Right for You?
- Best Supplements for Women in Their 30s
- Best Supplements for Hormonal Balance
- Best CoQ10 Supplement
For more evidence-based women’s health guides, visit peakhealthstack.com.
Stop Guessing Which Supplements Are Actually Working.
Your Peak Stack helps you log your supplements, track how you feel, and get AI-powered guidance on what is helping, what may be clashing, and what to adjust next.
