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vitamin D

Vitamin D3: Why a Popular 5,000 IU Dose Tops the NIH's Limit

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.

Categories: Vitamins & Minerals

Tags: supplement safety, bone health, vitamin D, vitamin D3 & NIH upper limit

Posted On: August 25 2026

Posted By: CV Blogger