What supplements should I take before IVF?

For most patients with no specific deficiencies: CoQ10 (200–600 mg/day), vitamin D if deficient (typically 1,000–4,000 IU/day to reach 30+ ng/mL), and a quality prenatal with folate. For PCOS: add inositol (myo-inositol + d-chiro-inositol 40:1 ratio). For diminished ovarian reserve or age 35+: consider DHEA 25 mg three times daily after consultation. For male factor: CoQ10 200–400 mg/day plus zinc 25 mg, selenium 100 mcg, vitamin C 500 mg, vitamin E 400 IU, L-carnitine 2–3 g. Start at least 90 days before your IVF cycle since both eggs and sperm need a full development cycle to reflect supplementation.

Does CoQ10 actually improve IVF success?

Evidence is moderate-to-strong, particularly for women over 35 and patients with diminished ovarian reserve. Multiple RCTs and meta-analyses show modest improvements in egg quality, fertilisation rates, and embryo development with CoQ10 supplementation. The mitochondrial energy support mechanism is well-established. Use ubiquinol form if you can afford it (better absorbed). Start 90 days before stimulation.

Is DHEA worth taking before IVF?

DHEA evidence is mixed. It may help women with diminished ovarian reserve (low AMH, low AFC, prior poor responders) modestly improve egg yield and possibly egg quality. It does not appear to help women with normal reserve or PCOS. Side effects can include acne and unwanted hair growth. Always check baseline DHEA-S before supplementing — taking it when levels are already normal can be counterproductive. Start 8–12 weeks before stimulation.

Does melatonin improve egg quality?

Melatonin acts as an antioxidant in follicular fluid and shows promise in egg quality, particularly for older patients. Evidence is moderate but growing. Typical dose is 3 mg at bedtime starting 8–12 weeks before stimulation. Side effects are minimal (mainly drowsiness). It may interact with sleep meds. Worth discussing with your reproductive endocrinologist, especially over 35.

Should I take vitamin D for fertility?

Yes, if you are deficient. Vitamin D deficiency (under 20 ng/mL or under 50 nmol/L) is associated with reduced IVF success, poorer embryo quality, and higher miscarriage. Aim for 30+ ng/mL (75+ nmol/L). Most patients need 1,000–4,000 IU/day to reach this; severely deficient patients sometimes need 5,000+ IU/day initially. Test, supplement, retest. Vitamin D status matters more than the exact supplementation strategy.

Does inositol help IVF outcomes?

For PCOS patients, yes — meaningfully. Myo-inositol + d-chiro-inositol in a 40:1 ratio (typically 4 g myo + 100 mg d-chiro daily) improves insulin sensitivity, ovulatory function, egg quality, and reduces OHSS risk in PCOS IVF cycles. For non-PCOS patients, evidence is much weaker. Start 90 days before stimulation if PCOS is your diagnosis.

Can supplements replace lifestyle changes for fertility?

No. The evidence is unambiguous that lifestyle factors (smoking, alcohol, BMI, sleep, stress) have larger effects on fertility than any supplement. Supplements work best as adjuncts to lifestyle, not substitutes. The single highest-impact intervention for most couples is stopping smoking and reducing alcohol — not adding any supplement.

Best IVF Supplements: An Evidence-Based Review

The IVF supplement market is full of confident claims and weak evidence. This review focuses on what the actual published research says — separating supplements with solid randomised trials behind them from supplements that are mostly marketing. The goal is a defensible recommendation, not a long shopping list.

The headline: a small number of supplements have meaningful evidence, most have weak or equivocal evidence, and a few have no evidence and active reasons for caution. Lifestyle factors (sleep, smoking, alcohol, weight) matter more than any pill — supplements are adjuncts.

What are the most evidence-backed IVF supplements?

CoQ10 (200–600 mg/day) for egg and sperm quality, particularly with age or diminished reserve. Vitamin D to correct deficiency (target 30+ ng/mL). Inositol (myo + d-chiro 40:1) for PCOS specifically. DHEA (25 mg three times daily) for diminished ovarian reserve only, after baseline testing. Melatonin (3 mg at bedtime) shows growing evidence for older patients. Prenatal with folate is universal baseline. Most other supplements have weaker evidence.

When should I start taking IVF supplements?

At least 90 days before your IVF stimulation cycle. Both eggs and sperm need a full development cycle (eggs ~90 days from antral follicle, sperm ~72 days from spermatogenesis) for supplementation to affect quality. Starting in the month before IVF is too late for most supplements to have meaningful effect on the cycle being run.

Tier A — Strong Evidence

CoQ10 / Ubiquinol

• Mechanism: Mitochondrial energy support; antioxidant in follicular fluid and sperm
• Dose: 200–600 mg/day (ubiquinol form preferred)
• Best for: Women 35+, diminished ovarian reserve, male factor
• Evidence: Multiple RCTs and meta-analyses showing improved egg quality, fertilisation, and embryo development
• Start: 90 days before stimulation
• Side effects: Minimal; occasional GI upset

Vitamin D (if deficient)

• Mechanism: Hormonal and immunomodulatory effects on endometrium and follicular development
• Dose: 1,000–4,000 IU/day to reach 30+ ng/mL (75+ nmol/L)
• Best for: Anyone with deficiency (under 30 ng/mL)
• Evidence: Strong observational and several RCT data showing deficiency reduces IVF success and increases miscarriage
• Start: Anytime; test, supplement, retest at 8–12 weeks
• Side effects: Minimal at normal doses; very high doses risk hypercalcaemia

Folate (in prenatal)

• Dose: 400–800 mcg standard; 5 mg if MTHFR variant or family history
• Best for: Universal — every patient TTC
• Evidence: Strong for neural tube defect prevention; some evidence for IVF outcomes
• Start: 3+ months before TTC

Tier B — Moderate Evidence

Inositol (PCOS only)

• Form: Myo-inositol + d-chiro-inositol in a 40:1 ratio (4 g + 100 mg daily)
• Best for: PCOS — improves insulin sensitivity, ovulatory function, egg quality, reduces OHSS
• Evidence: Strong specifically in PCOS cycles; weak in non-PCOS
• Start: 90 days before stimulation

DHEA (diminished ovarian reserve only)

• Dose: 25 mg three times daily (75 mg total)
• Best for: Low AMH, low AFC, prior poor responders
• Evidence: Mixed — some trials show improved egg yield and quality, others show no benefit
• Caution: Check baseline DHEA-S before starting; do not give to PCOS or normal-reserve patients
• Side effects: Acne, unwanted hair growth, mood changes

Melatonin

• Dose: 3 mg at bedtime
• Mechanism: Antioxidant in follicular fluid; circadian rhythm alignment
• Best for: Older patients (35+), prior poor egg quality
• Evidence: Several smaller RCTs showing improved egg quality; growing but not yet definitive
• Start: 8–12 weeks before stimulation

Male antioxidant stack

• Zinc 25 mg, selenium 100 mcg, vitamin C 500 mg, vitamin E 400 IU, L-carnitine 2–3 g, plus CoQ10
• Best for: Male factor, particularly elevated DNA fragmentation
• Evidence: Moderate — meta-analyses suggest improved sperm parameters and pregnancy rates
• Start: 90 days before partner's cycle

Your IVF journey, organised and free

IVFPath is built for IVF patients — track medications, appointments, lab results, and costs all in one place.

💊

Medication Reminders

Never miss a dose — log every injection and tablet

📅

Appointment Calendar

All your scans, retrievals and transfers in one view

💰

Cost Tracker

Track spending so nothing is a surprise

Start for free — no card needed

Free · No credit card · Works on any device

Tier C — Weak or Equivocal Evidence

Omega-3 (fish oil): May help endometrial receptivity; modest evidence; reasonable to include
NAC (N-acetylcysteine): Some PCOS trials show benefit; evidence weaker outside PCOS
L-arginine: Theoretical role in uterine blood flow; evidence weak
Royal jelly / bee pollen: Marketing-heavy, evidence thin; allergy risk
Maca root: Anecdotal claims widespread; controlled trials minimal
PQQ: Promoted for mitochondrial support; human fertility evidence essentially absent
Pine bark / Pycnogenol: Some male factor evidence; female evidence weak

A useful frame

If a supplement's evidence rests on a small handful of small trials with mixed results and aggressive marketing claims, it probably is not the lever that moves your outcome. Time and money spent here often comes at the cost of attention to higher-impact factors like sleep, smoking cessation, and BMI.

Supplements to Avoid or Be Cautious With

High-dose vitamin A: Teratogenic at high doses; check prenatal labels
Untested herbal blends: Many contain undisclosed phytoestrogens or unknown contaminants
Black cohosh, dong quai, vitex (chasteberry): Hormonal effects unpredictable; avoid during stimulation
St. John's wort: Interacts with many medications, including some used in IVF
High-dose vitamin E (over 1000 IU/day): Bleeding risk and unclear benefit
Anything from a supplement brand that does not third-party test: Quality variability is real

Supplement Stacks by Diagnosis

Diagnosis / Profile	Recommended core stack
Standard / unexplained	Prenatal, CoQ10, vitamin D (if deficient)
PCOS	Prenatal, CoQ10, inositol (myo + d-chiro), vitamin D
Diminished ovarian reserve	Prenatal, CoQ10 (high dose), DHEA, melatonin, vitamin D
Endometriosis	Prenatal, CoQ10, omega-3, vitamin D, NAC
Male factor	CoQ10, zinc, selenium, vitamin C, vitamin E, L-carnitine

Want a stack tailored to your specific situation?

The right supplement combination depends on your diagnosis, age, AMH, and baseline blood work. Nestie's AI assistant can help you build a personalised stack based on your test results and the questions to discuss with your reproductive endocrinologist.

Plan your stack with Nestie →

Timing and Quality

Start 90 days before stimulation — both eggs and sperm need a full development cycle for supplementation to affect quality
Choose third-party tested brands — USP, NSF, ConsumerLab certifications
Avoid proprietary blends where individual doses are not disclosed
Do not stack indefinitely — once IVF starts, add only what your doctor approves
Stop most supplements during stimulation unless directed otherwise; some can interact with medications

Frequently Asked Questions

References

Evidence ratings drawn from Cochrane reviews, ESHRE and ASRM practice committee opinions, published RCTs and meta-analyses on individual supplements (CoQ10, DHEA, inositol, vitamin D), and current ASRM guidance on antioxidant supplementation. This article is informational — discuss specific supplementation with your reproductive endocrinologist.