what is l carnitine for Deficiency: It, Causes, Symptoms, and More Carnitine: the claims and why

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The Merriam-Webster definition is: Any of various amides that are derived from two or more amino acids by combination of the amino group of one acid with the carboxyl group of another and are usually obtained by partial hydrolysis of proteins Merriam-Webster This covers a lot of molecules, some of which are already widely used

doi: 10.1364/BOE.389408 163

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Research suggests that GHK-Cu may support collagen synthesis, antioxidant enzyme activity, and gene expression related to extracellular matrix maintenance through copper-mediated biochemical pathways