Pereira A, Pinho AC, Sousa HS, et al
[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations
FDA "Compounding and the FDA: Questions and Answers" (regulatory status of compounded medications): fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers New England Journal of Medicine STEP 1 (Wilding et al., 2021)
Anyone claiming to sell it now is selling something unverified
Peptide YY ameliorates cerulein-induced pancreatic injury in the rat
Tirzepatide should be injected once weekly on the same day each week