AMH and polycystic ovary syndrome: Higher reduction in the AMH levels with a metformin dosage ≤ 1500 mg/day and duration of treatment ≤ 12 weeks when compared to higher dosages and duration of intervention, observed in this meta-analysis, suggests that a dosage of until 1500 mg metformin daily for until three months would already be effective enough for considerable reduction of AMH levels in women with PCOS.