The Pre-IVF Supplement Protocol: What to Take 90 Days Before Your Cycle

Why 90 Days?

Egg development (folliculogenesis) takes approximately 90 days from the time a dormant follicle is recruited to the point it becomes the mature egg your RE retrieves. During this window, the developing oocyte is sensitive to its nutritional environment — including the antioxidant protection around it, the mitochondrial energy available to it, and the hormonal signals guiding its maturation.

This means the eggs retrieved in your October IVF cycle were actually recruited in July. The supplements you take during this pre-cycle window are working on those specific eggs.

The Core Protocol (Strong Evidence)

1. Prenatal Multivitamin With Methylfolate

This is non-negotiable. A comprehensive prenatal provides the foundation: folate for neural tube prevention and DNA synthesis, iron for blood volume expansion, iodine for thyroid function, and B vitamins for energy metabolism.

Look for methylfolate (5-MTHF) rather than folic acid alone. Roughly 30–40% of women carry MTHFR variants that reduce folic acid conversion. Methylfolate bypasses this issue entirely. Some formulas include both forms — that’s fine.

Browse prenatal multivitamins with methylfolate →

2. CoQ10 (Ubiquinol Form): 400–600mg Daily

CoQ10 is the supplement with the strongest evidence for egg quality improvement, particularly for women over 35. It supports mitochondrial energy production in the developing oocyte — and mitochondrial function is the single biggest driver of egg quality.

Choose ubiquinol (the reduced, active form) over ubiquinone. Ubiquinol is 3–8x more bioavailable. At 400–600mg daily, studies have shown improvements in ovarian response, fertilization rates, and embryo quality.

Browse ubiquinol CoQ10 →

3. Vitamin D: Test First, Then Dose

A large IVF observational study found that women with vitamin D levels above 30 ng/mL had nearly twice the live birth rate per cycle compared to deficient women. That’s not a subtle difference.

But dosing without testing is reckless. At 40–60% deficiency rates among reproductive-age women, most people need 2,000–5,000 IU daily to reach optimal levels (40–60 ng/mL). Some need more, some less. Test at baseline, supplement, retest at 8 weeks.

4. Omega-3 Fatty Acids (DHA-Dominant): 1–2g Daily

DHA supports follicular fluid quality, reduces inflammation, and is critical for early embryonic development. A 2022 Harvard study linked DHA supplementation to improved embryo morphology.

Choose a DHA-dominant formula (at least 500mg DHA per serving). Fish oil and algae-based options both work — algae-based if you’re vegetarian or concerned about contaminants.

The Situational Add-Ons (Moderate Evidence)

DHEA: Only If Your RE Prescribes It

DHEA (25–75mg daily) has shown promise for diminished ovarian reserve (DOR) in several studies, but it’s a hormone precursor, not a simple supplement. It can affect testosterone levels, acne, and hair growth. Your RE should monitor levels if you’re taking it. Never self-prescribe.

Melatonin: 3mg at Bedtime

Small studies suggest melatonin’s antioxidant properties may improve oocyte quality. The evidence isn’t strong enough to be in the core protocol, but the risk profile is low. Many REs include it in their pre-IVF recommendations.

NAC (N-Acetyl Cysteine): 600–1,200mg Daily

NAC is a glutathione precursor and potent antioxidant. It has some evidence for improving outcomes in women with PMOS (formerly PCOS) and endometriosis. It’s generally well-tolerated and compatible with IVF medications.

Inositol: For PMOS Patients

Myo-inositol (2–4g daily), sometimes combined with D-chiro-inositol at a 40:1 ratio, has solid evidence for improving insulin sensitivity and ovarian function in women with PMOS. If you don’t have PMOS, the benefit is less clear.

The 90-Day Timeline

What Your RE Needs to Know

Research from the FAZST/IDEAL study revealed that 70% of fertility patients take supplements, but only 25% tell their care team. This creates real clinical risks:

• Hormone assay interference: Biotin at high doses (common in hair/skin/nails supplements) can falsely lower TSH and estradiol readings, potentially altering your medication dosing
• Blood thinning: Fish oil, vitamin E, and some herbals can increase bleeding risk during egg retrieval
• Medication interactions: Some supplements affect how your body metabolizes fertility drugs

Write down every supplement, every dose, and bring the actual bottles to your appointment. No RE will judge you for trying to optimize — they just need the full picture.

Related reading: What the Largest Supplement Study Found • Vitamin D Dosing Deep-Dive • IVF clinical guides at ConceiveGuide • TTC basics at FertileStart