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Commercial serums offer 12-24 months unopened shelf life with professional preservative systems and 6-12 months post-opening depending on packaging (airless pump best), while DIY serums last only 1-2 weeks refrigerated without professional preservatives
Often called the sunshine vitamin, vitamin D does more than just support bone strengthit can also play a role in testosterone production
Zhang H, Bosch-Marce M, Shimoda LA, Yee ST, Jin HB, Wesley JB, et al
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