@CNN: Women who carry an uncommon genetic variant may produce an enzyme that breaks down hormones found in birth control, a new study finds https://t.co/dBoR98H7UI https://t.co/OR6TKRb8am

@CNN: Women who carry an uncommon genetic variant may produce an enzyme that breaks down hormones found in birth control, a new study finds https://t.co/dBoR98H7UI https://t.co/OR6TKRb8am