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GHK-Cu has the broadest base, with several decades of dermal, scalp and cosmetic-research publications, and a reasonable foundation in connective-tissue biology

The vast majority is from grain-fed cows and even ones that claim to be grass-fed are still fed grain or hay in the colder months

IV 600-1200mg weekly once is recommended for skin lightening

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The committee's recommendation does mean these peptides are FDA-approved drugs

The strongest, best-documented effects are the antioxidant support and the gradual evening of skin tone