Vitamin B12 made for injections come in vials or ampoules
Surg Today 38(8):716725 Pevec D, Novinscak T, Brcic L et al (2010) Impact of pentadecapeptide BPC 157 on muscle healing impaired by systemic corticosteroid application
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And this is important both in terms of thinking about what effects you're going to get of taking a given peptide, if you decide to do that, as well as potential side effects, as well as things like how to adjust dosage and how long to take a peptide, whether or not to cycle the peptide, et cetera
doi:10.1038/sj.ejcn.1602212
But, being careful is key, mainly for those at high risk. Vitamin B12 is key for making myelin, the fatty stuff around nerve fibers