A quality prenatal vitamin is the non-negotiable baseline for anyone TTC. Beyond that, CoQ10, vitamin D, and omega-3s have the strongest evidence for supporting both male and female fertility. The supplement market is overwhelming — this guide cuts through the noise with research-backed recommendations and honest assessments of what works, what might work, and what's hype.
In This Guide
The Prenatal Vitamin Foundation
A prenatal vitamin isn't just for pregnancy — it's critical for the 3+ months before conception when eggs are maturing and early fetal development occurs (often before you know you're pregnant). Neural tube closure happens at just 4 weeks gestation, which is why adequate folate before conception is essential.
What to Look for in a Prenatal
| Nutrient | Target Amount | Why It Matters | Notes |
|---|---|---|---|
| Folate | 800–1,000 mcg | Neural tube closure, DNA synthesis | Methylfolate (5-MTHF) preferred over folic acid — 40% of women have MTHFR variants affecting folic acid conversion |
| Iron | 18–27 mg | Blood volume expansion, oxygen transport | Take with vitamin C for better absorption; may cause constipation |
| Choline | 300–550 mg | Brain development, neural tube closure, placental function | Most prenatals contain little to none — supplement separately if needed |
| Iodine | 150–220 mcg | Thyroid function, fetal brain development | Especially important if you don't use iodized salt |
| Vitamin D | 2,000–4,000 IU | Immune function, implantation, pregnancy maintenance | Most prenatals contain only 400–600 IU — likely insufficient |
| Omega-3 DHA | 300–600 mg | Fetal brain & eye development, anti-inflammatory | Usually requires a separate supplement |
| B12 | 2.6–10 mcg | DNA synthesis, neurological development | Methylcobalamin form preferred; especially important for vegetarians |
Choline is arguably the most under-supplemented nutrient in prenatal care. The recommended intake is 450mg/day during pregnancy, yet the average American woman consumes only ~300mg. Studies link adequate choline to reduced neural tube defect risk (independent of folate), improved placental function, and better infant cognitive outcomes. Only about 8% of prenatal vitamins contain the recommended amount — check your label.
The Three Biggest Nutrient Gaps
1. Choline
As noted above, this is the most common deficiency. If your prenatal contains less than 300mg of choline (most don't), supplement separately. Food sources include eggs (1 egg = ~150mg), liver, and soybeans. A choline supplement of 200–300mg alongside a choline-containing prenatal is a reasonable approach.
2. Vitamin D
Up to 40% of reproductive-age women are vitamin D deficient (<30 ng/mL). Vitamin D plays a role in implantation, immune modulation, and pregnancy maintenance. Meta-analyses associate adequate vitamin D with better IVF outcomes. Most experts now recommend 2,000–4,000 IU daily, far more than the 400–600 IU found in most prenatals. Get your blood level tested and aim for 40–60 ng/mL.
3. Omega-3 Fatty Acids (DHA/EPA)
Essential for fetal brain and eye development, anti-inflammatory effects, and possibly egg quality. Few prenatals include sufficient omega-3s — you typically need a separate fish oil or algae-based DHA supplement. Target: at least 300mg DHA daily (600mg is better). Choose brands that are third-party tested for heavy metals and oxidation (look for IFOS certification).
Supplements for Egg Quality
Egg quality — the chromosomal integrity and mitochondrial energy of your eggs — is the primary determinant of IVF success and natural conception rates. While age is the biggest factor, the final 90 days of egg maturation offer a window to optimize the cellular environment.
CoQ10 (Coenzyme Q10)
The most evidence-backed supplement for egg quality. CoQ10 is essential for mitochondrial energy production, and mitochondrial function declines with age. The egg requires massive energy to undergo meiosis (cell division) correctly — inadequate energy increases the risk of chromosomal errors.
Dosing: 200–600mg/day. Use the ubiquinol form (not ubiquinone) — it's the active, pre-converted form with better bioavailability. Studies using 600mg/day in IVF patients showed improved egg quality and embryo development, particularly in women over 35.
📦 Our Pick: Ubiquinol CoQ10
Look for ubiquinol (not ubiquinone) in 200mg softgels for easy dosing. Trusted brands include Jarrow Formulas QH-Absorb and NutraBlast Ubiquinol — both use the Kaneka ubiquinol form with proven bioavailability.
Browse Ubiquinol CoQ10 →DHEA (Dehydroepiandrosterone)
Primarily studied in women with diminished ovarian reserve (DOR). DHEA is a precursor hormone that the ovaries convert to androgens needed for follicle development. Multiple studies show improved egg yield, quality, and IVF outcomes in women with DOR who supplement with 25mg 3x/day for 8–12 weeks before IVF.
Important: DHEA should only be used under medical supervision. It's not recommended for women with PCOS (who already have elevated androgens) or for general use in women with normal ovarian reserve.
Melatonin
Yes, the sleep hormone. Melatonin is a powerful antioxidant that accumulates in follicular fluid, protecting eggs from oxidative damage. Doses of 3mg nightly have shown improved oocyte quality in IVF studies. It also helps with sleep quality, which independently supports reproductive health.
Supplements for Male Fertility
Male fertility supplementation has strong evidence support — particularly antioxidants, which combat the oxidative stress that damages sperm DNA.
| Supplement | Dose | Evidence | Primary Benefit |
|---|---|---|---|
| CoQ10 (Ubiquinol) | 200–400mg/day | Strong | Improves motility, protects DNA |
| L-Carnitine | 1–2g/day | Strong | Fuels sperm energy, improves motility |
| Zinc | 25–50mg/day | Strong | Essential for sperm production |
| Selenium | 100–200mcg/day | Moderate | Supports morphology and count |
| Vitamin C | 500–1,000mg/day | Moderate | Antioxidant protection |
| Omega-3 DHA | 1–2g/day | Moderate | Sperm membrane integrity |
| Folate | 400–800mcg/day | Moderate | DNA synthesis, sperm count |
📦 Our Pick: Comprehensive Male Fertility Multi
Rather than buying 7 separate bottles, look for a male fertility supplement that combines the core nutrients — CoQ10, zinc, selenium, L-carnitine, and folate — in one product. FertilAid for Men and Beli Vitality are two options that cover the basics.
Browse Male Fertility Supplements →Supplements for PCOS
PCOS involves insulin resistance and hormonal imbalance — and specific supplements address these root causes.
Inositol (Myo-Inositol + D-Chiro-Inositol)
The standout PCOS supplement. Myo-inositol acts as an insulin sensitizer and improves ovulatory function. The recommended ratio is 40:1 (myo:D-chiro-inositol) at a dose of 4,000mg myo-inositol + 100mg D-chiro-inositol daily. Multiple RCTs show improved menstrual regularity, reduced testosterone, better egg quality in IVF, and improved insulin sensitivity. Ovasitol is the most-studied commercial formulation.
📦 Our Pick: Inositol for PCOS
Ovasitol (by Theralogix) is the most studied formulation with the research-backed 40:1 ratio. The unflavored powder mixes into water or any beverage. It's a twice-daily supplement — the sustained dosing matters for effectiveness.
Browse Inositol Supplements →Berberine
An increasingly popular supplement for PCOS, berberine works as a natural insulin sensitizer with effects comparable to metformin in some studies. Typical dose is 500mg 2–3 times daily with meals. Do NOT combine berberine with metformin without medical supervision — the combined effect can drop blood sugar too low.
NAC (N-Acetylcysteine)
A powerful antioxidant and mucolytic agent. In PCOS, NAC at 600mg 3x/day has shown improved insulin sensitivity, reduced testosterone, and enhanced ovulatory response to clomiphene. Some RE's use it as an adjunct to ovulation induction protocols.
The Evidence Scorecard
Not all supplements are created equal. Here's an honest assessment of the research quality behind common fertility supplements:
| Supplement | Evidence Strength | Recommended? | Notes |
|---|---|---|---|
| Prenatal Vitamin | ⭐⭐⭐⭐⭐ | Essential | Non-negotiable baseline for TTC |
| CoQ10 | ⭐⭐⭐⭐ | Yes | Strongest evidence for egg quality |
| Vitamin D | ⭐⭐⭐⭐ | Yes (test first) | Aim for 40–60 ng/mL blood level |
| Omega-3 DHA | ⭐⭐⭐⭐ | Yes | Benefits for both fertility and pregnancy |
| Inositol (PCOS) | ⭐⭐⭐⭐ | Yes (if PCOS) | 40:1 ratio, 4g/day |
| L-Carnitine (male) | ⭐⭐⭐⭐ | Yes (males) | Strong motility evidence |
| Zinc (male) | ⭐⭐⭐⭐ | Yes (males) | Essential for spermatogenesis |
| DHEA (DOR) | ⭐⭐⭐ | Maybe (DOR only) | Under medical supervision only |
| Melatonin | ⭐⭐⭐ | Maybe | 3mg nightly; antioxidant in follicular fluid |
| Berberine (PCOS) | ⭐⭐⭐ | Maybe (if PCOS) | Don't combine with metformin |
| Royal Jelly | ⭐⭐ | Insufficient data | Animal studies promising, human data lacking |
| Maca Root | ⭐⭐ | Insufficient data | May support libido; fertility claims unproven |
| Vitex (Chasteberry) | ⭐⭐ | Caution | Can affect hormones unpredictably; avoid with fertility meds |
What to Avoid
Vitex (Chasteberry) — Acts on the pituitary and can disrupt hormonal signaling, especially if you're also taking fertility medications. High-dose vitamin A (retinol) — Teratogenic above 10,000 IU/day; use beta-carotene form instead. St. John's Wort — Interacts with many medications and may affect hormone metabolism. Excessive herbal "fertility blends" — Many contain undisclosed active ingredients that can interfere with prescribed treatments. If you're working with an RE, disclose everything you're taking.
Our Top Supplement Picks
📦 Best Prenatal Vitamin: FullWell Prenatal
Our editorial pick for the most comprehensive prenatal on the market. Contains methylfolate (not folic acid), chelated minerals, choline (600mg — one of the few prenatals that meets the target), and bioavailable forms of every key nutrient. Designed by a reproductive dietitian. 8 capsules/day (yes, it's a lot — that's what it takes to fit everything).
Check Price on Amazon →📦 Best Omega-3: Nordic Naturals Prenatal DHA
Third-party tested, IFOS-certified for purity, with 480mg DHA per serving. No fishy aftertaste. The gold standard for prenatal omega-3 supplementation.
Check Price on Amazon →📦 Best CoQ10: Jarrow Formulas QH-Absorb Ubiquinol
200mg ubiquinol per softgel, using the patented Kaneka form with proven bioavailability. One of the most-trusted CoQ10 brands recommended by reproductive endocrinologists.
Check Price on Amazon →In-Depth Supplement Reviews
Head-to-head comparisons, brand reviews, and detailed guides for every fertility supplement category.
Fertility Nutrition Guide
The Mediterranean fertility diet, foods to eat and avoid, meal plans, and recipes to support conception.
Getting Started with TTC
Your complete preconception checklist — when to start supplements, what tests to get, and how to track your cycle.
Frequently Asked Questions
Ideally, at least 3 months before you start trying. This gives your prenatal vitamin time to build adequate nutrient stores, CoQ10 time to support the final maturation phase of your eggs, and allows male fertility supplements to affect the current cycle of sperm production (which takes ~74 days). Three months is the minimum; six months is even better.
About 40% of people have variants in the MTHFR gene that reduce their ability to convert folic acid to its active form (5-MTHF). Methylfolate bypasses this conversion entirely, ensuring everyone gets the benefit regardless of genetics. It's not more expensive in most prenatals, so there's no downside — and for the 40% with MTHFR variants, it's meaningfully better.
No. Supplements can optimize your body's fertility potential and may improve treatment outcomes, but they can't fix structural problems (blocked tubes, fibroids), severe male factor, or overcome significant age-related decline. Think of supplements as the foundation layer — they make everything else work better, but they're not a substitute for medical intervention when it's needed.
A reasonable monthly budget is $50–$100 for a comprehensive female fertility stack (prenatal + CoQ10 + vitamin D + omega-3). Male fertility supplements run $30–$60 monthly. You can spend more on premium brands, but the core nutrients matter more than the label. Don't let supplement costs delay you from trying or seeking medical care if needed.
For most supplements, consistent daily dosing is best. The exception is DHEA (for diminished ovarian reserve, only under medical supervision), which some RE's adjust based on treatment cycles. Seed cycling and other cycle-phase supplementation protocols are popular online but lack strong clinical evidence. Keep it simple: take your core supplements daily.