Three supplements are essential for almost everyone trying to conceive: folic acid, vitamin D (if your level is low) and iodine. Others, like CoQ10, myo-inositol and omega-3, make sense only for specific situations. A good supplement isn't the most expensive or the most “miraculous”: it's the one with evidence of benefit for your situation.
| Supplement | Dose | Key point |
|---|---|---|
| Folic acid | 400 to 800 mcg/day | The absolute priority: start 3 months ahead |
| Vitamin D | 1,000 to 4,000 IU/day, depending on the deficiency | Almost always needed if your test is below 30 ng/mL; under medical guidance |
| Iodine | 150 mcg/day | Essential for the baby's neurological development; usually already in prenatal multivitamins |
Source: Map to the Positive, Chapter 08.
Folic acid is the best-studied supplement of preconception and gets its own page: dose, timing and special cases. Vitamin D depends on your test result, which is why the preconception tests come before the supplement shelf. The book's summary adds one more point: if your iron is low, it also needs to be corrected.
In the book's 90-day plan, supplements begin in month 1: folic acid, vitamin D and a multivitamin. The nutrition chapter adds that women who take a multivitamin daily have a 41% lower risk of ovulatory infertility. The effect comes mainly from folic acid, but the whole combination matters.
Growing evidence of benefit for women over 35 or with low ovarian reserve. It acts as a mitochondrial antioxidant. Dose: 200 to 600 mg/day, ideally in the ubiquinol form. Start at least 3 months before trying.
Strong evidence of benefit in women with PCOS: it improves egg quality and cycle regularity. Dose: 2 g twice a day, often combined with 50 mg of D-chiro-inositol. It's specific to PCOS, not a general fertility booster.
Benefits the baby's neurological development and has anti-inflammatory effects. Dose: 200 to 300 mg of DHA/day. Prefer purified sources, free of heavy metals.
For men with borderline or below-ideal sperm quality, the book lists a targeted set, taken for at least 90 days:
There are dozens of products sold as a “fertility guarantee” with exotic blends. Most have no scientific evidence to back the promises. No supplement, on its own, guarantees pregnancy. Get the basics done well before buying any “miracle.”
Smart supplementation is Chapter 08 of Map to the Positive, in Station I, Foundation, right after the 11 preconception tests that tell you which of these you actually need. Station III goes further, with supplements for specific fertility situations, the full male stack and the popular products that don't have strong evidence behind them.
Take 30 days. If it does not give you more clarity than everything you have read for free so far, ask for a refund and you get every cent back. We cannot promise you a pregnancy. We can promise you will not be guessing.