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Gastrointestinal conditions Some gastrointestinal conditions may affect how vitamin B12 is digested or absorbed, such as: history of gastrointestinal surgery celiac disease Crohns disease pernicious anemia infections, such as from Helicobacter pylori bacteria or parasites pancreatic insufficiency or cancer bowel cancer folic acid deficiency small intestinal bacterial overgrowth Vitamin B12 injections may be more helpful for people with gastrointestinal conditions than oral products

10.1016/j.chembiol.2017.08.028 165 LukeyM

For anyone curious about whether peptides are legal and how they are regulated, the regulatory picture for semaglutide is also worth understanding separately

Reduce exposure to toxins: choose low-VOC products, avoid BPA and phthalates in plastics, filter drinking water if contamination risk exists, and limit pesticide residue by washing produce