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GHK-Cu (copper peptide) side effects reported in available literature include localized injection site reactions, mild systemic inflammation markers, and rare allergic responses

No nasty GI side effects

In a cervical cancer cell line (HeLa), the compound reduced cell proliferation in a concentration- and time-dependent way and lowered expression of phospho-Akt and SIRT1, two proteins tied to tumor progression, while a non-cancer reference cell line was less affected

The number of Glutathione injections required for skin whitening varies from person to person, depending on the skin type and the concern that has led to skin darkening