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Early studies on Gly-His-Lys (GHK), first discovered in human plasma in the 1970s, demonstrated their ability to modulate gene expression, stimulate collagen synthesis, and accelerate wound healing, sparking broad interest in these bioactive molecules [23]
(PubMed) Gibellini F, Smith TK
In one small randomized control study on cancer patients, consuming 40 grams of whey protein isolates along with zinc and selenium increased the glutathione levels as well as immunity markers, including an increase of 4.8% in their immunoglobulin G levels compared to the control
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