NIH caps adult vitamin D at 4,000 IU (100 mcg) a day, yet a popular 5,000 IU softgel sells at 625% of the Daily Value. Here's what the trial evidence actually shows.
bone health
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Vitamin K for Bone and Artery Health: What 31 Clinical Trials Show
A 2,600 mcg vitamin K softgel delivers 22x the adult AI. Here's what 31 pooled clinical trials found for bone density, artery health, and the warfarin risk.