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Humans can't form carotenoids - they need to eat them

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The reduction of IIS in Laron subjects unmasks the potential role of persistent hyperactive IIS mediated by Western diet in the development of diseases of civilization and offers a rational perspective for dietary adjustments with less insulinotropic diets like the Paleolithic diet

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How GHK-Cu Works in the Skin Copper peptides influence skin through multiple overlapping mechanisms: Collagen and elastin synthesis

PLoS One 8 (10), e75644