Current research does not give a definitive answer on this subject
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Officially, the FDA cites: Insufficient large-scale clinical trials Concerns about consistency, sourcing, and manufacturing standards The need to meet formal drug approval requirements Critics argue (fairly) that this system: Favors large pharmaceutical companies Makes it hard to approve naturally occurring peptides Leaves promising, low-risk compounds in regulatory limbo The short version: This FDA restrictive regulatory change of mind wasnt driven by a sudden safety scare, it was driven by regulatory process and economics
An unexpected finding in our studies was the loss of improved lipid tolerance in Dpp4 EC/ mice, with or without coadministration of sitagliptin, following BMT, implying an interaction between bone marrowderived cells and the metabolic actions emanating from the reduction of DPP-4 activity in endothelial cells
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