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It provides a way to study lipolytic mechanisms without the confounding variables introduced by full growth hormone administration

its most often applied topically as a cream or serum

- GHK-Cu is a copper-binding research peptide studied in models involving skin biology, collagen-associated pathways, extracellular matrix research, wound-response signaling, hair follicle pathway models, angiogenesis, antioxidant response, and tissue-remodeling biology

You can draw your own conclusions about why

Bioavailability is typically 10-20% with absorption enhancers

For example, gastric cancer [further] damages the cells that produce intrinsic factor, a requirement for medical utilization of Vitamin B12