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General Tolerability Most users experience GHK-Cu without significant issues, especially at commonly recommended concentrations of 12%

Zhang X, Tu D, Li S et al (2022) A novel synthetic peptide SVHRSP attenuates dopaminergic neurodegeneration by inhibiting NADPH oxidase-mediated neuroinflammation in experimental models of Parkinsons disease

Doses used clinically generally start modestly and can be adjusted upward based on the patient, with the intravenous route favored precisely because it sidesteps the oral-absorption question

In further experiments, four insomniac patients adapted in the laboratory for 1 night, with placebo injections for 2 nights, were treated continuously for 4 days with DSIP administered 1 hour before bedtime