What do systematic reviews say?

Metformin vs clomiphene

Metformin may leads to higher clinical pregnancy rate per womanaParticipants with BMI < 30 kg/m2… compared with clomiphene citrate (low certainty).

• Metformin for ovulation induction (excluding gonadotrophins) in women with polycystic ovary syndrome 2019 · Cochrane Headline outcomes only
  OR 1.56 [1.06, 2.29]
  6 studies · 530 participants
  Low