This is partly why supplementation has drawn interest from both the wellness and dermatology communities
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Dietary-grade material is not automatically pharmaceutical grade
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[PubMed] [Google Scholar] Saitoh M, Nishitoh H, Fujii M, Takeda K, Tobiume K, Sawada Y, Kawabata M, Miyazono, K and Ichijo H
For 1m, you get 50mcg per unit (IU)