Beyond the basics, five supplements have evidence for specific situations: CoQ10 for women 35+ or with low ovarian reserve, myo-inositol for PCOS, vitamin D3 if you are deficient, omega-3 for every TTC woman and NAC in specific cases under medical guidance. None of them works right away: allow at least 90 days.
| Supplement | For whom | Dose | Key detail |
|---|---|---|---|
| CoQ10 | 35+ or low ovarian reserve | 200 to 600 mg a day, split into 2 doses | Ubiquinol form; start 90 days before trying |
| Myo-inositol | PCOS | 2 g twice a day (4 g a day total) | Ideally combined with 50 mg of D-chiro-inositol; effect in 3 to 6 months |
| Vitamin D3 | Deficiency (below 30 ng/mL) | Commonly 2,000 to 4,000 IU a day | Dose set by your lab result; target 40 to 60 ng/mL |
| Omega-3 (EPA + DHA) | Every TTC woman | 1,000 to 2,000 mg a day, EPA + DHA combined | Purified fish oil or algae oil (vegan); look for mercury-free certification |
| NAC (N-acetylcysteine) | Endometriosis, PCOS, recurrent miscarriage | 600 mg twice a day | Under medical guidance, in specific cases |
CoQ10 works in the mitochondria of your eggs, improving the cell's energy quality. In studies, women over 35 who took 200 to 600 mg a day for 3 months before conception showed significant improvement in egg quality, and for IVF the evidence is even stronger. Ubiquinol is preferred because it is more bioavailable than ubiquinone, especially after 40.
For women with polycystic ovary syndrome, myo-inositol has very solid evidence: it improves cycle regularity, reduces insulin resistance and raises the rate of spontaneous ovulation.
Women with vitamin D below 30 ng/mL have reduced fertility rates and a higher risk of miscarriage. Supplementation corrects it easily, but the dose has to be set by your lab result.
Take vitamin D only under medical guidance: too much vitamin D is toxic.
It lowers systemic inflammation, improves cervical mucus quality and is essential for fetal neurological development. Most TTC women get far less than the ideal amount.
There is growing evidence for women with endometriosis, PCOS and recurrent miscarriage. NAC works as an antioxidant and an immune modulator, and it is used under medical guidance in specific cases.
There is no immediate effect. The quality of the egg released this cycle was already determined 90 days ago. That is why the minimum protocol for real impact is:
| Days of supplementation before trying | When it applies |
|---|---|
| 90 | The minimum |
| 120 | Ideal (4 months) for full impact |
| 180 | If you have PCOS or endometriosis, or are 38+ |
Advanced supplementation is Chapter 22 of Map to the Positive, in Station III (Optimization). It builds on the basic supplements from Station I, and the same chapter covers the supplement stack for your partner and the popular supplements without strong evidence. Station III also covers nutrition, sleep and stress, exercise and a 90-day integrated plan.
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.
References: Unfer V et al. Myo-inositol effects in women with PCOS. Gynecological Endocrinology, 2017.