Best Supplements for Fertility: Evidence-Based Guide for Men and Women

Quick Answer: Best Supplements for Fertility

If you’re looking for the most evidence-backed supplements to support fertility, here’s the short list:

• CoQ10 — improves egg quality and sperm motility by supporting mitochondrial energy production (Giannubilo et al., 2020)
• Folate/Methylfolate — essential for neural tube defect prevention and egg quality (Viswanathan et al., 2023)
• Vitamin D (guide) — vitamin D-replete women had 46% higher clinical pregnancy rates after IVF (Chu et al., 2018)
• Zinc — foundational for testosterone, sperm quality, and the “zinc sparks” that activate the egg at fertilization
• Magnesium — regulates reproductive hormones, reduces cortisol, supports progesterone balance
• Omega-3 fatty acids — women taking omega-3s had 1.51x the probability of natural conception (Stanhiser et al., 2022)
• Myo-Inositol — improves oocyte maturation and pregnancy rates in women with PCOS (Unfer et al., 2017)

The sections below cover each supplement in detail — what it does, who it’s for, and how to take it effectively.

Dosage Comparison Table

How Supplements Affect Fertility

Supplements don’t override biology — but they do address specific deficits that directly impact reproductive function. Here’s how the key mechanisms work:

Egg Quality

Egg quality is largely determined by mitochondrial function. Eggs with healthy mitochondria produce more ATP, which fuels proper cell division during fertilization. As women age, mitochondrial efficiency declines. Supplements like CoQ10 directly replenish the coenzyme responsible for mitochondrial energy output, slowing this decline. For a complete guide to optimizing this process, see our article on supplements for egg quality.

Sperm Health

Sperm quality is affected by oxidative stress, nutrient deficiency, and hormonal imbalance. A Cochrane review of 90 RCTs (10,303 subfertile men) found that antioxidant supplementation increased the odds of pregnancy by 2.97x and live birth by 1.8x (Smits et al., 2019). Zinc supports testosterone synthesis and protects sperm DNA from oxidative damage. CoQ10 improves sperm motility. Omega-3s support sperm membrane integrity.

Hormone Balance

Hormones regulate every phase of the reproductive cycle — from ovulation to implantation. For a complete breakdown of which vitamins support each phase, see our guide to fertility vitamins for women. Magnesium and Vitamin D both play roles in regulating estrogen, progesterone, and testosterone. Deficiencies in either nutrient are linked to irregular cycles, poor luteal phase function, and reduced sperm production. For women with diminished ovarian reserve, DHEA supplementation can also support hormone balance. Women with PCOS should see our dedicated PCOS supplements for fertility guide. Women with endometriosis should see our endometriosis supplements guide.

Best Supplements for Fertility

CoQ10 for Fertility

CoQ10 is the most well-researched fertility supplement available. It acts as both an antioxidant and a mitochondrial cofactor, making it relevant for both egg and sperm quality. A meta-analysis of 5 RCTs (449 women) found that CoQ10 supplementation significantly increased clinical pregnancy rates in women undergoing assisted reproduction (Giannubilo et al., 2020). A landmark RCT of 186 women with diminished ovarian reserve found that CoQ10 pretreatment (600 mg/day for 60 days) improved ovarian response, fertilization rate (67.49%), and the number of high-quality embryos (Xu et al., 2018).

The key question is which form to take and at what dose. Ubiquinol (the reduced form) is significantly better absorbed than ubiquinone, especially in people over 35.

For a full breakdown of top-rated products, see our guide to the Best CoQ10 Supplements for Fertility. If you’re unsure about dosing, our article on How Much CoQ10 for Fertility covers the evidence-based ranges. And if you’re deciding between forms, read our comparison of Ubiquinol vs CoQ10 for Fertility.

Folate (Methylfolate) for Fertility

Folate is arguably the most essential nutrient for any woman planning to conceive. It is required for DNA synthesis, cell division, and neural tube development in the earliest days of pregnancy — often before a woman knows she is pregnant.

The landmark MRC Vitamin Study — a double-blind RCT across 33 centers and 7 countries — demonstrated a 72% reduction in neural tube defect recurrence with periconceptional folic acid supplementation (MRC Vitamin Study Research Group, 1991). An updated USPSTF systematic review (990,372 participants) reaffirmed that folic acid supplementation before and during early pregnancy reduces NTD risk, supporting the Grade A recommendation of 400–800 mcg daily (Viswanathan et al., 2023).

Methylfolate vs. folic acid: Approximately 30–40% of the population carries MTHFR gene variants that reduce their ability to convert synthetic folic acid into the active form (5-MTHF) the body uses. Methylfolate (5-MTHF) bypasses this conversion entirely, making it the preferred form for preconception supplementation — especially if you haven’t been tested for MTHFR status.

Look for supplements listing “L-5-methyltetrahydrofolate” or “5-MTHF” rather than “folic acid.” Most quality prenatal vitamins now include methylfolate. Dose: 400–800 mcg daily, starting at least one month before conception.

Myo-Inositol for Fertility

Myo-inositol has become one of the most important supplements for women with PCOS — the most common cause of ovulatory infertility. It is a naturally occurring sugar alcohol that acts as a second messenger for insulin signaling and follicle-stimulating hormone (FSH).

A meta-analysis of RCTs found that myo-inositol (alone or with D-chiro-inositol) improved oocyte maturation, pregnancy rates, and hormonal parameters including LH, testosterone, and insulin resistance markers in women with PCOS (Unfer et al., 2017). A more recent systematic review informing the 2023 international PCOS guidelines analyzed 30 RCTs and found evidence supporting metabolic and hormonal benefits, though results were inconsistent enough that the guidelines recommend shared clinical decision-making rather than universal prescription (Fitz et al., 2024).

The standard dose is 2,000–4,000 mg of myo-inositol daily, often combined with 50–100 mg of D-chiro-inositol (maintaining a 40:1 ratio). For the full PCOS protocol, see our PCOS supplements for fertility guide and myo-inositol guide.

Vitamin D for Fertility

Vitamin D functions as a hormone precursor and directly influences the production of estrogen, progesterone, and anti-Mullerian hormone (AMH). A systematic review and meta-analysis of 11 cohort studies found that vitamin D-replete women had significantly higher clinical pregnancy rates (OR 1.46) and live birth rates (OR 1.33) after ART compared to vitamin D-deficient women (Chu et al., 2018).

Optimal levels for fertility are generally cited as 40–60 ng/mL (serum 25-OHD). Many adults fall well below this range, especially in northern climates or with limited sun exposure. Testing your Vitamin D level before supplementing is ideal to calibrate the right dose.

Magnesium for Fertility

Magnesium is involved in over 300 enzymatic reactions in the body — many of which directly affect reproductive health. It supports progesterone production, regulates cortisol (which suppresses reproductive hormones when chronically elevated), and helps maintain a healthy uterine environment for implantation.

In men, magnesium supports testosterone synthesis and protects against sperm DNA fragmentation. Most people are mildly deficient due to poor dietary intake and high stress loads — making supplementation particularly useful for those actively trying to conceive.

Not all forms of magnesium are equally effective. Glycinate and malate are the best-tolerated and best-absorbed forms. For product recommendations and dosing guidance, see our full guide to the Best Magnesium Supplements for Fertility.

Zinc for Fertility

Zinc is foundational to male fertility. It’s concentrated in the prostate and testes, where it supports testosterone production, sperm formation, and the structural integrity of sperm DNA. A meta-analysis of over 2,600 infertile men found significantly lower seminal zinc levels compared to fertile controls, and zinc supplementation significantly improved semen volume, motility, and morphology (Zhao et al., 2016).

For women, zinc supports egg maturation, follicle development, and the “zinc sparks” — coordinated bursts of zinc release at fertilization that are required for the egg to activate and begin embryo development.

For a complete breakdown of the best zinc forms, dosing, and what to look for on a supplement label, see our guide to the Best Zinc Supplements for Fertility.

Omega-3 Fatty Acids for Fertility

Omega-3s (EPA and DHA) reduce systemic inflammation, which is a key driver of poor egg quality and implantation failure. A prospective cohort study found that women taking omega-3 supplements had 1.51x the probability of natural conception after adjusting for age, obesity, race, and other supplement use (Stanhiser et al., 2022). A separate meta-analysis confirmed omega-3 intake significantly improved pregnancy rates and fertilization rates in women undergoing fertility treatment (Trop-Steinberg et al., 2024).

In men, DHA is a major structural component of sperm cells. Diets low in omega-3s are associated with reduced sperm count, motility, and morphology. Look for a fish oil or algae-based supplement with at least 500–1000 mg DHA per serving. For a deep dive into dosage, sourcing, and how omega-3s fit into a fertility stack, see our full guide to omega 3 for fertility.

Selenium for Male Fertility

Selenium is an essential trace mineral for sperm production and function. It is a component of selenoproteins that protect sperm from oxidative damage and are required for normal sperm morphology. A study of 690 infertile men found that daily selenium (200 mcg) combined with vitamin E (400 IU) for 100+ days produced a 52.6% improvement in sperm motility and morphology, with a 10.8% spontaneous pregnancy rate (Moslemi & Tavanbakhsh, 2011).

Selenium also supports thyroid function, which directly regulates the reproductive hormones that govern ovulation and cycle regularity. The recommended dose for male fertility is 100–200 mcg/day as selenomethionine. Do not exceed 400 mcg/day — selenium toxicity is a real concern at high doses.

DHEA for Diminished Ovarian Reserve

DHEA is specifically indicated for women with diminished ovarian reserve (DOR) or poor ovarian response to IVF stimulation. It is a precursor hormone that provides the raw materials the ovaries need to produce estrogen and testosterone for follicle development.

A meta-analysis of 9 RCTs (833 patients) found DHEA supplementation increased the number of retrieved oocytes and improved clinical pregnancy rates in women with DOR or poor ovarian response undergoing IVF/ICSI (Xu et al., 2019).

DHEA is hormonal — it should only be taken under the guidance of a reproductive endocrinologist. It is not appropriate for women with normal ovarian reserve or PCOS. The typical dose is 25 mg three times daily (75 mg/day), started at least 6–8 weeks before IVF stimulation. For the full evidence breakdown, see our DHEA for fertility guide.

Vitamin C for Fertility

Vitamin C is one of the most accessible antioxidants for reproductive health. It protects both eggs and sperm from oxidative damage, supports progesterone production in women, and has been shown to significantly improve sperm count and motility in men. Most adults benefit from 500–1,000 mg/day. For a complete breakdown of the evidence, dosing, and how to stack vitamin C with other fertility supplements, see our guide to vitamin C for fertility.

NAC (N-Acetylcysteine) for Fertility

NAC is a precursor to glutathione — your body’s master antioxidant. It protects eggs and sperm from oxidative damage, improves insulin sensitivity (especially important for PCOS), and reduces inflammation that can disrupt ovulation and implantation.

Research shows NAC combined with clomiphene citrate significantly improves ovulation and pregnancy rates in PCOS patients. It also supports sperm quality by reducing DNA fragmentation. Typical fertility doses range from 600–1,800 mg daily. For the full evidence breakdown, see our guide to NAC supplement for fertility.

Probiotics for Fertility

Probiotics support fertility by optimizing the vaginal microbiome, reducing chronic inflammation, and improving nutrient absorption. A Lactobacillus-dominant vaginal flora is linked to significantly higher implantation and live birth rates during IVF, while gut health directly affects hormone metabolism and sperm quality. For strain recommendations, dosing, and how to stack probiotics with your fertility protocol, see our guide to probiotics for fertility.

Iron for Fertility

Iron deficiency is the most common nutritional deficiency in women of reproductive age, and it directly impacts fertility. The Nurses’ Health Study found that women who supplemented with iron had a 40% lower risk of ovulatory infertility. Iron supports oxygen delivery to the ovaries, mitochondrial function in egg cells, and healthy endometrial development for implantation.

Choose iron bisglycinate for best absorption with fewest side effects, and aim for a ferritin level of 50–100 ng/mL before trying to conceive. For the full breakdown of dosing, forms, and absorption tips, see our guide to iron supplements for fertility.

Supplements to Approach with Caution

Not every supplement marketed for fertility has strong evidence. These are commonly recommended but warrant a more cautious approach:

• Maca Root — Popular in fertility forums but clinical evidence for human fertility outcomes is limited. Most studies are in animal models or small, poorly controlled human trials. Not harmful, but not a priority over evidence-backed options.
• Vitex (Chasteberry) — Some evidence for cycle regulation and luteal phase support, but study quality is generally low. May interfere with IVF medications. Discuss with your RE before using.
• Royal Jelly — Antioxidant properties exist, but human fertility data is scarce. Some allergenic potential, especially in people with bee allergies. See our royal jelly guide for the full evidence review.

The supplements above aren’t necessarily harmful — but if your budget or supplement load is limited, prioritize the evidence-backed options first (CoQ10, folate, vitamin D, zinc, magnesium, omega-3).

How to Choose the Right Fertility Supplements

Choose the Right Form

Not all supplement forms are equal. The form determines how well a nutrient is absorbed and used by the body. Key examples:

• CoQ10: Ubiquinol absorbs significantly better than ubiquinone, especially over age 35
• Folate: Methylfolate (5-MTHF) is preferred over folic acid, especially for MTHFR carriers
• Magnesium: Glycinate and malate are well-absorbed and gentle on digestion; oxide is largely wasted
• Zinc: Picolinate and bisglycinate are more bioavailable than zinc oxide or sulfate
• Omega-3: Triglyceride form absorbs better than ethyl ester; choose products with high DHA content
• Vitamin D: D3 (cholecalciferol) is more effective than D2 at raising serum levels

Quality Markers

Look for supplements that carry third-party certification (NSF, USP, or Informed Sport), list the exact form of the nutrient, and disclose the full ingredient list without proprietary blends. Avoid products with excessive fillers, artificial dyes, or unlisted additives.

Fertility Supplement Stacks

Individual supplements work well — but targeted stacks can address specific goals more efficiently. These are practical starting points, not medical prescriptions.

Egg Quality Stack

Designed for women looking to improve egg quality before conception or IVF retrieval. Ideally started 3–6 months before your target cycle.

• CoQ10 (ubiquinol) — 400–600 mg/day
• Methylfolate — 400–800 mcg/day
• Magnesium glycinate — 300 mg/day
• Vitamin D3 — 2,000–4,000 IU/day
• Omega-3 (high DHA) — 1–2 g/day

Male Fertility Stack

Targets sperm count, motility, morphology, and DNA integrity. Sperm takes approximately 74 days to fully mature — allow at least 3 months for results.

• CoQ10 (ubiquinol or ubiquinone) — 200–400 mg/day
• Zinc bisglycinate — 20–30 mg/day
• Selenium — 100–200 mcg/day
• Omega-3 (high DHA) — 1 g/day
• Vitamin D3 — 2,000 IU/day

PCOS Fertility Stack

Targets insulin resistance, androgen excess, and ovulatory dysfunction — the three core drivers of PCOS-related infertility.

• Myo-Inositol — 2,000–4,000 mg/day (40:1 with D-chiro-inositol)
• Magnesium glycinate — 300–400 mg/day
• Vitamin D3 — 2,000–5,000 IU/day
• NAC — 600–1,800 mg/day
• Omega-3 — 1–2 g/day

IVF Support Stack

Used during IVF stimulation prep to maximize egg maturation, embryo quality, and implantation conditions. Confirm compatibility with your clinic before starting.

• CoQ10 (ubiquinol) — 600 mg/day (starting 60–90 days pre-retrieval)
• Methylfolate — 400–800 mcg/day
• Magnesium glycinate — 300 mg/day
• Vitamin D3 — dosing based on blood test results
• Omega-3 — 1–2 g/day DHA+EPA (stop 5–7 days before retrieval)
• DHEA — 75 mg/day (DOR only, under RE guidance)

For a complete phase-by-phase protocol — including what to stop before retrieval and post-transfer support — see our dedicated IVF supplements guide.

Frequently Asked Questions

What is the most important supplement for fertility?

CoQ10 has the strongest evidence base for improving both egg quality in women and sperm parameters in men. A meta-analysis of 5 RCTs found it significantly increases clinical pregnancy rates in women undergoing assisted reproduction. That said, no single supplement replaces a complete approach — deficiencies in Vitamin D, folate, magnesium, or zinc can also significantly impair fertility outcomes.

How long do fertility supplements take to work?

Egg maturation takes approximately 90 days (3 months). Sperm regeneration takes around 74 days. For meaningful results, most fertility supplements need to be taken consistently for at least 2–3 months before their impact on egg or sperm quality can be assessed.

Can I take all these supplements together?

In most cases, yes. CoQ10, magnesium, zinc, omega-3, folate, and Vitamin D are commonly stacked without interactions. The main exceptions: high-dose zinc (over 40 mg/day) can compete with copper absorption, and Vitamin D dosing above 5,000 IU/day should be guided by blood test results. Always review your full supplement regimen with a healthcare provider before starting.

Are fertility supplements the same for men and women?

There is meaningful overlap — CoQ10, Vitamin D, and omega-3s benefit both sexes. But the goals differ. Women’s protocols focus on egg quality, folate, and hormonal support; men’s protocols target sperm production via zinc, selenium, and DNA integrity. Dosing also varies between protocols.

Do I need to take supplements if I’m already eating a healthy diet?

A nutrient-dense diet is the foundation, but it rarely provides therapeutic doses of key fertility nutrients. CoQ10 levels cannot be meaningfully raised through diet alone. Vitamin D levels are difficult to maintain without supplementation, especially in northern climates. And ~48% of Americans don’t even meet the basic RDA for magnesium from food. Supplementation fills the gap between what food provides and what fertility demands.

What should I look for when buying fertility supplements?

Prioritize bioavailable forms (ubiquinol over ubiquinone, methylfolate over folic acid, glycinate over oxide), third-party testing for purity and potency, transparent labeling without proprietary blends, and clinically relevant dosing. Price is not a reliable quality indicator.

References

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2. Xu Y, et al. Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women. Reprod Biol Endocrinol. 2018;16(1):29. PubMed
3. MRC Vitamin Study Research Group. Prevention of neural tube defects: results of the MRC Vitamin Study. Lancet. 1991;338(8760):131-137. PubMed
4. Viswanathan M, et al. Folic acid supplementation to prevent neural tube defects: updated evidence report for the USPSTF. JAMA. 2023;330(5):460-466. PubMed
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