A comparison of HPLC and bioassay methods for plasma melanotan-II (MT-II) [PMID: 7981427] Laboratory literature summary: A comparison of HPLC and bioassay methods for plasma melanotan-II (MT-II) determination: application to a pharmacokinetic study in rats

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PubMed, doi:10.1093/jnci/djw103
Because its primary mechanisms involve circulating through the bloodstream and signaling cells throughout the body supporting collagen production in the skin, hair follicle health on the scalp, and tissue remodeling in joints and connective tissue all at once a delivery method that reaches systemic circulation efficiently is arguably better matched to how GHK-Cu actually works than a localized injection
Foods like oranges, strawberries and capsicum are excellent sources