bpc-157 uses research Peptides: Research, Evidence & UK Guide BPC-157 Canada Research Guide 2026:

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However, taking them together isnt likely to bring any negative side effects

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The capsule stack page also notes important context, including that peptides support healing but do not replace nutritional correction, and that addressing underlying deficiencies such as iron, vitamin D or B12 supports optimal results

One very small study found that people who used semaglutide had lower B12 levels, but these patients also had bariatric surgery prior to using semaglutideso its hard to say if using semaglutide would lead to a B12 deficiency, requiring additional B12