What do systematic reviews say?

Metformin vs insulin

Maternal outcomes: oral anti‐diabetic agent (metformin) may leads to lower caesarean section compared with insulin (low certainty).

• Oral anti‐diabetic agents for women with established diabetes/impaired glucose tolerance or previous gestational… 2017 · Cochrane Headline outcomes only
  RR 0.73 [0.61, 0.88]
  3 studies · 241 participants
  Low