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Free radicals may affect skin hydration by reducing elastin and collagen of skin that may result in wrinkle formation

Cyanocobalamin, vitamin B12 preparations containing benzyl alcohol should be avoided in premature neonates because benzyl alcohol has been associated with gasping syndrome, a potentially fatal condition characterized by metabolic acidosis and CNS, respiratory, circulatory, and renal dysfunction

GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is widely studied for collagen synthesis, copper-mediated tissue remodelling and skin/connective-tissue research pathways

That is the legitimate basis for interest

Additional research is exploring their influence on immune modulation, oxidative stress response, and inflammatory signaling within the gastrointestinal tract