Their absence from the label means incidence is unknown, not that the symptom cannot occur
"Vitamin B12 in Health and Disease"
When to Seek Medical Advice Before Use Medical advice should be sought before any use, particularly by individuals with a history of thyroid carcinoma, MEN2, pancreatitis, diabetes, cardiovascular disease, renal or hepatic impairment, or pregnancy
E.Van't VeerP.et al (2013)
As an investigational research peptide, BPC-157 is widely studied in laboratory environments for its interactions with cellular signaling pathways involved in angiogenesis, extracellular matrix remodeling, inflammatory responses, endothelial biology, and tissue repair mechanisms