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in pigeons, it provides energy during races, lawn shows, and when travelling by oxygenating the blood and increasing alertness
Published research has confirmed this hypothesis specifically for hair follicle biology: AHK-Cu has the most direct published evidence for hair follicle effects, while GHK-Cu has the broader regenerative biology across multiple tissue types
Redness, itching, or mild irritation at the application site can occur, particularly during initial use or with higher concentrations
Subcutaneous administration (which bypasses first-pass metabolism and delivers more peptide to target tissues) was not extensively tested in human trials, and this route is what most current research protocols use
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