It can also be made in a lab and is often taken with other B vitamins
In UK clinical settings, the recognised standard diluent for injectable medicines is Water for Injections BP (single-use, preservative-free), and the choice of diluent must always follow the licensed product's Summary of Product Characteristics (SmPC)
On the direct evidence, the position is pretty blunt: there is no published human trial of the two together, no combination toxicology, and no convincing indexed animal study showing the pair outperforms either peptide alone
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Some peptides are naturally produced in the body, such as insulin, a hormone secreted by the pancreas that decreases blood sugar levels