Pentadeca Arginate (PDA)

Pentadeca Arginate (PDA; the pentadecapeptide Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val formulated as the arginate salt; the underlying peptide is identical to BPC-157, CAS 137525-51-0; molecular formula C62H98N16O22 free peptide; molecular weight 1419.55 free peptide; the arginate salt adds counterions and is formulated for improved stability) is a research-grade alternative formulation of the BPC-157 pentadecapeptide that has emerged in research-grade peptide vendor catalogs in 2023 to 2024 as a stabilized analog. The pharmacological argument is that the arginate counterion improves aqueous solubility and extends shelf life of the lyophilized solid relative to acetate-salt BPC-157, which is the standard formulation; the underlying peptide sequence and pharmacology are identical, and any differences between PDA and BPC-157 in vivo are attributable to formulation rather than to a different molecule. The published preclinical record on the BPC-157 sequence is summarized in the Kodiac BPC-157 monograph (KDC-MN-002): tendon and ligament healing, vascular reorganization, gastrointestinal mucosal protection, dopaminergic system modulation, broad rodent injury-recovery activity, with the limitation that the literature is dominated by the originating Sikiric group at the University of Zagreb. PDA has no independent published preclinical record beyond the parent BPC-157 work; vendor literature emphasizes formulation stability claims rather than novel pharmacology. Investigators should not assume that PDA differs pharmacologically from BPC-157 acetate; the choice between formulations should be made on stability and handling considerations. Reconstitution and dosing follow BPC-157: bacteriostatic water for injection, refrigerated storage of reconstituted solution, parenteral administration at 250 to 500 mcg per dose. The compound is research-grade and not approved by any regulatory authority for human or veterinary use.