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Scientific classification places BPC-157 in the peptide category due to its amino acid structure and signaling role
The liquid phase synthesis method involves dissolving amino acids in organic solvents and completing the synthesis of peptide chains through steps such as protection, activation, and condensation

However, some studies reported the inability of TAT-PTD to translocate monolayers of Caco-2 and MDCK epithelial cells (Violini et al., 2002), and in intestinal insulin absorption from the ileum in rats ( in vitro study of epithelial transport of insulin by D-form of arginine octamer (D-R8) indicated that cellular uptake is the critical step for efficient epithelial absorption and showed that D-R8 mediates intestinal epithelial transport of insulin by energy-independent unsaturable uptake ( Biotinylated transportan and its analog transportan 10 were reported to pass through epithelial Caco-2 monolayer cells mainly via transcellular transport and partly via paracellular pathway, while penetratin passes across cell monolayers in low yields, possibly due to partial degradation (Lindgren et al., 2004)
This represents direct evidence of the mechanism at the cellular level, though its translation to clinical longevity outcomes in humans continues to be studied