@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/sMFjrl2Q49 https://t.co/zZgf84CmHl

@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/sMFjrl2Q49 https://t.co/zZgf84CmHl