Improper Storage: Once reconstituted, peptides like BPC 157 are sensitive
However, some of the other side effects of biologics could cause you to feel a lump at or near the injection site
Frontiers in Bioengineering and Biotechnology 10:893936
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[7] Commonly observed adverse effects include transient injection-site discomfort, breast tenderness, nausea, fluid retention, and mild mood fluctuation, whereas rarer but serious events encompass venous or arterial thromboembolism, gallbladder disease, significant elevation of blood pressure, and hormone-sensitive malignancies such as endometrial or breast cancer