햇빛에 얼마간 노출되면 비타민d가 만들어질까? #1분건강
Synopsis
비타민D 합성하려면 자외선 노출, 얼마면 돼? #자외선과비타민D #비타민D합성 #자외선차단 #서울대학교병원 #서울대병원 #서울대 ...
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