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Youll see it referenced both ways in the literature, and some vendors label it as 177-191 for this reason

It l expensive

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Why Preclinical Results Cannot Resolve the Salt Question Animal studies may investigate BPC-157 under a particular formulation, but they do not establish that every commercial salt form has the same: Purity Stability Absorption Impurity profile Pharmacokinetics Safety A salt-form claim must therefore be supported by evidence concerning that exact material rather than by BPC-157 literature in general