維生素D的前驅物在皮膚曝曬陽光時合成，再經由肝臟與腎臟代謝成活化的維生素D，幫助腸胃道吸收鈣質，維持骨骼健康與神經肌肉功能。但是這可不是要你整天脫光在外面曝曬。台灣的陽光毒辣，一不小心可能會曬傷，而且又會加速皮膚老化。
曝曬陽光並不一定能穩定產生維生素D。季節、緯度、使用防曬乳、膚色、城市的煙霧、年紀等因素都會影響維生素D合成的效率。
一般來說，每個人都應該要試著每天在早上或傍晚各曬太陽10-20分鐘。曝曬的部位至少包含臉和手臂上肢。記得不要擦防曬油與包得密不透風，那會影響效果。記得要避開早上10點至下午2點陽光最強的時段，且要避免曬傷。
除了幫助自己以外，家中有小孩的家長也可以現在就開始幫小孩存骨本。多鼓勵小孩嘗試各種運動與戶外活動，盡量減少在電腦及電視前度過童年，就是最好的存骨本辦法。
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