fda bpc-157 unapproved drug warning letter Public advisory FDA to weigh easing limits
Description
Penetratin-conjugated liposomes increased salmon calcitonin permeation across TR146 layers and ex vivo porcine buccal tissue, demonstrating peptide-assisted transcellular transport under route-relevant conditions

Marino, S., Hogue, I

This trend has clearly been evident in the patent literature (Table 2)

It frequently requires long term maintenance therapy to control disease activity
