Fertility Blends

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

How to take it

Interactions

With medications

• warfarin, DOACs and antiplatelets

  Vitamin E above 400 IU/day is linked to increased bleeding risk. check the vitamin E content and discuss it with your prescriber before starting

• fertility drugs and hormonal treatment (IVF stimulation protocols)

  Chasteberry acts on prolactin, and DHEA, black cohosh and red clover have hormonal activity that can confound a stimulation cycle. tell your fertility clinician every ingredient you are taking before a cycle starts

• metformin and other diabetes medication

  Myo-inositol at 2-4 g/day lowers glucose and improves insulin sensitivity, adding to the drug's effect. monitor glucose when starting, especially in PCOS

With other supplements

• separate zinc supplements

  Stacked blends readily exceed the 40 mg/day zinc upper limit, which causes copper deficiency over time. add up zinc across all products and stay under 40 mg/day

• separate selenium supplements

  Selenium toxicity — hair and nail loss, neuropathy — begins above about 400 µg/day, and blends stack toward it fast. count selenium across everything you take

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

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

Related in Women's health

• Folic Acid (Vitamin B9) Strong evidence
• Inositol (Myo-Inositol) Moderate evidence
• Strontium Limited evidence
• Soy Isoflavones Moderate evidence
• Ipriflavone Limited evidence
• Evening Primrose Oil Limited evidence