Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback
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BPC-157 is considered a research peptide, or research chemical, which means its not actually legal to sell BPC-157 for human use in the U.S
Private clinics, on the other hand, offer a much faster approach
The results of the excretion experiment showed that the main excretory pathways of BPC157 involve the liver and kidney, which was also consistent with the excretion characteristics of peptide drugs (Czock et al., 2012
That regulatory action means that any BPC-157 currently circulating, whether from a compounding pharmacy or a research-chemical website, exists outside the standard quality-assurance framework applied to licensed drugs