The colour comes from the GHK-Cu component, a copper(II) complex with a characteristic blue chromophore
Bondue T, Berlingerio SP, Siegerist F, Sendino-Garvi E, Schindler M, Baelde HJ, Cairoli S, Goffredo BM, Arcolino FO, Dieker J, Janssen MJ, Endlich N, Brock R, Gijsbers R, van den Heuvel L, Levtchenko E (2023) Evaluation of the efficacy of cystinosin supplementation through CTNS mRNA delivery in experimental models for cystinosis
A recent study by our group also demonstrated that schisandrin B and 5-FU cotreatment resulted in synergistic antitumour effects by improving drug bioavailability, enhancing metabolism and attenuating MDR [128]
[4] The result is a GHRH-receptor agonist that survives slightly longer in circulation than the unmodified hormone while still producing the same fundamental action: stimulation of the somatotroph cells of the anterior pituitary to release GH in a pulsatile, physiologic pattern, which in turn raises IGF-1