The combined vial contains equal amounts of both components a format matching the most-cited research protocols in which the two peptides are administered at a 1:1 ratio
Any excess is safely metabolized and eliminated through normal kidney function no harmful buildup occurs
Injectable GHK-Cus primary side effect involves injection site reactions
[6/7] malignancy Parenchymal brain tumor (either primary or metastatic)
This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)
Fujiwara, M., Nakano, T., Tamoto, S., Yamada, Y., Fukai, M., Takada, K., Ashida, H., Shimada, T., Ishihara, T., and Seki, I