Analysis 2.4. Comparison 2 Head-to-head antioxidant(s), Outcome 4 Total sperm motility at 6 months; type of antioxidant........ Analysis 2.5. Comparison 2 Head-to-head antioxidant(s), Outcome 5 Total sperm motility at 6 months

There is low quality evidence from only four small randomised controlled trials suggesting that antioxidant supplementation in subfertile males may improve live birth rates for couples attending fertility clinics. Low quality evidence suggests that clinical pregnancy rates may increase. There is no evidence of increased risk of miscarriage but this is uncertain as the evidence is of very low quality. Data were lacking on other adverse effects. Further large well-designed randomised placebo-controlled trials are needed to clarify these results.

Analysis 2.2. Comparison 2 HA-ICSI versus viscous medium containing HA (SpermSlow), Outcome 2 Miscarriage per woman randomly assigned.

Trusted evidence. Informed decisions. Better health.

No abstract