tnation bpc 157 BPC-157 BPC-157 - Wikipedia
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doi: 10.1038/s41579-020-00459-7
But most peptides are used over weeks, so you need bacteriostatic water

How 5-Amino-1MQ Might Work Q11: How does 5-Amino-1MQ work

Absorbed vitamin B12 is transported via specific B12 binding proteins, transcobalamin I and II to the various tissues

Maintain Sterility: Always wipe the rubber stopper of both the peptide vial and the bacteriostatic water vial with an alcohol prep pad before every puncture