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Research peptides and pharmaceutical-grade peptides exist in completely different regulatory universes

Absorption issues: Some medical conditions such as pernicious anemia, celiac disease, Crohn's disease, and surgical removal of part of the stomach or intestines can impair the body's ability to absorb B12 from food

WADA: Explicitly included on the World Anti-Doping Agency (WADA) Prohibited List, meaning competitive athletes are banned from using it Thevis, Mario, and Wilhelm Schnzer

Its kinda boring, compared to some of the other stuff Ive talked about thus far, but there it is

Ask the supplier which laboratory performed the test and whether it is an independent third-party lab or in-house testing

Shiff SJ, Shivaprasad P, Santini DL (2003) Cyclooxygenase inhibitors: drugs for cancer prevention