Limited evidenceWomen's health

Fertility Blends

Fertility blends bundle antioxidants, vitamins and herbs into an expensive monthly subscription. The Cochrane reviews that pool this literature find low- to very-low-certainty evidence on both the male and female side, with the male live-birth signal disappearing once high-risk-of-bias trials are removed.

What the science says

Antioxidant blends improve live birth rates in subfertile men Limited evidence
The 2022 Cochrane review (90 studies, 10,303 subfertile men, 20 different antioxidants) reported that antioxidants may increase live birth (OR 1.43, 95% CI 1.07-1.91) — but this rested on only 246 live births across 12 small-to-medium trials, and when studies at high risk of bias were removed the effect vanished (Peto OR 1.22, 95% CI 0.85-1.75). The review graded the evidence as low to very low certainty.
Antioxidant supplements help subfertile women conceive Limited evidence
The 2020 Cochrane review of antioxidants for female subfertility (63 trials, 7,760 women) concluded there was low- to very-low-quality evidence that an antioxidant may benefit subfertile women, and that the evidence in support of supplemental oral antioxidants remains limited. It found no evidence of increased miscarriage, multiple birth or ectopic pregnancy, though that reassurance was also very low certainty.
Myo-inositol restores ovulation in PCOS Limited evidence
The Cochrane review of inositol for subfertile women with PCOS found very low-quality evidence and was unable to establish a clear benefit for live birth or clinical pregnancy, while noting a possible improvement in ovulation rate. Trials typically use myo-inositol 2-4 g/day, often with 200 µg folic acid, for 12-24 weeks — a defensible thing to try under supervision, but not a proven fertility treatment.
Branded fertility blends have their own evidence Limited evidence
Most named products cite one or two small, manufacturer-funded trials of the finished blend, often with surrogate endpoints such as menstrual cycle regularity or sperm concentration rather than pregnancy or live birth. Ingredient doses inside proprietary blends are frequently below the trial doses for the components (CoQ10 trials use 200-600 mg/day; L-carnitine trials use 2-3 g/day), and no blend has been shown superior to its individual parts.

Dosage & safety

Studied doseComponent doses that have actually been trialled: CoQ10 200-600 mg/day, L-carnitine 2-3 g/day (often with 1 g acetyl-L-carnitine), zinc 25-66 mg/day, selenium 100-200 µg/day, vitamin C 500-1,000 mg/day, vitamin E 200-400 IU/day, lycopene 4-8 mg/day, and myo-inositol 2-4 g/day for PCOS. Because spermatogenesis takes about 74 days, male trials run at least three months. Commercial blends usually list many of these ingredients at 10-40% of the studied amounts; compare the Supplement Facts panel against these numbers before paying a premium.

SafetyIndividually these ingredients are well tolerated, but stacking blends can push zinc and selenium toward or above their upper limits (40 mg and 400 µg respectively) — chronic excess zinc causes copper deficiency, and selenium toxicity causes hair and nail loss and neuropathy. Vitamin E above 400 IU/day has been linked to bleeding risk and should be reviewed if you take anticoagulants. Female blends often contain chasteberry (vitex), which acts on prolactin and can interfere with hormonal treatment and with fertility drug protocols, and some contain black cohosh, red clover or DHEA — tell your fertility clinician everything you are taking, because several of these can confound IVF stimulation. Stop most herbal components once pregnancy is confirmed. Supplements are not a substitute for a fertility work-up; unexplained subfertility beyond 12 months (6 months over age 35) warrants medical evaluation.

Scientific references

Antioxidants for male subfertility
de Ligny W, Smits RM, Mackenzie-Proctor R, et al. — Cochrane Database Syst Rev, 2022
Antioxidants for female subfertility
Showell MG, Mackenzie-Proctor R, Jordan V, Hart RJ — Cochrane Database Syst Rev, 2020
Inositol for subfertile women with polycystic ovary syndrome
Showell MG, Mackenzie-Proctor R, Jordan V, et al. — Cochrane Database Syst Rev, 2018

Where to buy

Fairhaven Health, FH Pro® Fertility Multivitamin for Men, 180 Capsules

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