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It does not mean the compound has stopped working
If you are interested in PQQ, consider how it fits into your broader goals
AHK-Cu is a copper-binding tripeptide complex built around the alanine-histidine-lysine sequence
Neurology 84 , 24492456 (2015)
"Peptides are short chains of amino acids that act as messengers in the body, signaling cells to perform specific functions." - New Definition Health Collagen, a protein that peptides often stimulate, makes up about 30% of the total protein in the human body
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