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BPC-157 + TB-500 Blend is a research combination of two synthetic peptides: BPC-157 (a stable gastric pentadecapeptide) and TB-500 (the active N-terminal fragment Ac-LKKTETQ derived from Thymosin Beta-4)

The phase 2 monotherapy trial is the closest we have to an isolated view, and even there the reported endpoints were weight and safety rather than gastric-emptying kinetics

These are often in response to certain triggers, such as smoking or infection

Studies have found that responsiveness to metformin can highly vary among individuals due to OCT1 single nucleotide polymorphism (Kawoosa et al., 2022), and changes in OCT expression, modulated by weight (Moreno-Navarrete et al., 2011)

If you want to use these topical treatments alongside each other, start with lower concentrations and do a patch test