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However, if a specialized laboratory test is used, stable metabolites of the peptide can typically be detected for roughly 24 to 48 hours after administration, with some studies suggesting trace detection up to 4 days later

Gastrointest Endosc Clin N Am 2015;25(1):107121

Now, that doesn't mean that they aren't without some safety concerns

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BPC 157 is a peptide that naturally occurs in the human stomach, specifically within a protein known as Body Protection Compound (BPC)

Frequently asked questions What is the BPC-157 + TB-500 blend?+ It is a combined research preparation of two tissue-repair peptides, BPC-157 and TB-500, supplied together for in-vitro study