Because collagen molecules are too large to effectively absorb into the skin
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Research Insights Skin Health and Anti-Aging GHK-Cu : Demonstrated to restore skin elasticity and thickness while reducing hyperpigmentation and photoaging effects ( 3, 5 )
In tendon explant and fibroblast systems, it is linked to focal adhesion signaling and cell migration behavior
Drugs.com.
Many individuals use these medications to manage metabolic health even when they arent seeking extreme weight loss