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If you had to pick one: GHK-Cu has broader biological reach (roughly 4,000 genes modulated versus 300-500 for retinol) [3] and a higher responder rate for collagen improvement in the only direct comparison
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Endogenous toll-like receptor ligands and their biological significance
Recommended Dosage: The recommended dose for injections ranges from 600 mg to 1,200 mg administered 1 to 2 times per week
Q: Skin whitening injections vs
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