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A 30% variation in peak plasma level doesn't translate to a 30% variation in clinical outcome (oxidative stress markers, skin lightening, etc.)
GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration, 2015
Glutathione occurs naturally in the body, but levels can decline with age, stress, illness, or exposure to toxins
McGrath-Morrow and J
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