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GHK-Cu works through cumulative tissue exposure, not peak concentration

doi: 10.1016/0306-9877(88)90129-6

typically companies publish fuller results later in a peer-reviewed medical journal

By attenuating enkephalin catabolism, Selank effectively prolongs the biological activity of endogenous opioid peptides: Increased leu-enkephalin half-life in blood plasma observed in clinical study participants Enkephalin-related effects on anxiety appear independent of direct opioid receptor activation Studies in morphine-dependent rats showed Selank (0 Anxiety and Stress Research Generalized Anxiety Disorder Models The most extensively studied application of Selank is its anxiolytic activity across multiple preclinical models and in a limited number of clinical investigations conducted in Russia

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But is there evidence to back up these claims