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They should not be treated as interchangeable
These symptoms are usually worst during the first few weeks and during each dose increase, then gradually improve as the body adapts
What science exists for GHK-Cu is all rather positive (a 2018 analysis of the science concluded the peptides actions appear to be health positive, saying it boosts collagen, improves tissue repair and has powerful cell-protective actions, including multiple anti-cancer and anti-inflammatory actions)
Maddison KJ, Kosky C, Walsh JH
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