Miscarriage risk and caffeine use in early pregnancy
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Low to moderate caffeine intake (<200 mg/d) has not been shown to significantly increase miscarriage risk. Evidence is mixed concerning higher doses. Several cohort studies found an association between an increased risk of miscarriage and caffeine doses above 200 to 500 mg/d. Until more evidence is available, it would seem prudent for women to avoid high caffeine intake if they are trying to conceive.
Evidence Based Practice 11(11): 11+.