In the body, antioxidants work in a "network." They help "recharge" each other
Lysine plays several roles in humans, most importantly proteinogenesis, but also in the crosslinking of collagen polypeptides, uptake of essential mineral nutrients, and in the production of carnitine, which is key in fatty acid metabolism
If labs are needed, you will typically pay out of pocket
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J.et al (2015)
EGF is bioactive but barrier-limited: the molecule does what it does only if it reaches the keratinocyte layer, and standard topical formulations deposit most of it on the stratum corneum where it has no relevant receptor