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Its the same version with the same 15 amino acid sequence as BPC-157, but with an added arginate salt for better stability

Triethyl lead toxicity in relation to brain glutathione and glutathione S-transferase [PMID: 7112612] Laboratory literature summary: Triethyl lead toxicity in relation to brain glutathione and glutathione S-transferase

This method, typically subcutaneous or intramuscular, often represents the gold standard for achieving high and predictable bioavailability for many peptides and small molecules

Beyond the lack of research on BPC-157, there are concerns over how people are accessing peptides in general