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Its high proline content (five of fifteen residues) is widely cited as the structural basis for its unusual proteolytic stability

Muramyl peptide modulates innate immunity

Supports Healthy Neurological Function : The brain's high oxygen consumption makes it particularly vulnerable to oxidative stress

Clinical Evidence in Humans The topical evidence base is unusually robust for a research peptide: Facial aging study (71 women, 12 weeks): A GHK-Cu facial cream documented increased skin density and thickness, reduced laxity, improved clarity, and reduced fine lines and depth of wrinkles (PMID 26236730)

Function, Oxidative, and Inflammatory Stress Parameters in Immune Cells as Predictive Markers of Lifespan throughout Aging

As would be expected, the women produced higher levels of insulin and testosterone in response to the dose of sugar