case report adverse event bpc-157 BPC 157 Side Effects: What You Should Know BPC-157 General Info Sheet
Description
doi: 10.1158/1078-0432.982.11.3 Killmurray C
Mild reactions are very common and come in the form of a lump or swelling around the site of the injection

Could happen with any injection I believe not only vaccines

the arginate salt form is used in capsule formulation for stability

I really am hoping that this will help
