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What is measured in these rats and mice (and occasionally in small groups of human volunteers) is often not a hard endpoint like muscle strength or weight loss, but surrogate biomarkers: molecules in the blood that have an indirect link to a hard endpoint

Safety Profile: When prepared correctly and given at recommended doses, side effects are generally mild (local irritation or mild systemic symptoms)

GHK-Cu: The Skin Regenerator GHK-Cu, or Copper Tripeptide-1, is a naturally occurring molecule composed of glycine, histidine, and lysine bound to a copper ion

Frequency: Some protocols split the dose into multiple injections throughout the week to keep levels stable, while others use larger, less frequent injections