bpc-157 safety human adverse effects case report General Info Sheet BPC-157 Side Effects and Safety:

Because of this, individuals supplementing this form of B12 often report improved quality of sleep, often will require slightly less sleep, and will not uncommonly report that they feel a bit more refreshed when waking in the morning

Chemical degradation does not always produce visible changes

We prioritize data reliability, controlled conditions, and the advancement of best practices in peptide reconstitution and compound stability, supporting precise and reproducible research outcomes

Negative side effects may include a paradoxical decrease in energy levels (most likely due to detoxification from methylation) or slight pain at the injection site which diminishes over 5-10 days

[PubMed Citation] European Public Assessment Report (EPAR): Product Information (Cyanokit)

Thats enough to last three to five years if you stopped absorbing any at all