By comparison, oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less if you have low intrinsic factor, atrophic gastritis, celiac disease, Crohn's, or a history of gastric bypass
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This triple-agonist mechanism is what makes it potentially more effective than single-agonist peptides like semaglutide , but it also means the gastrointestinal side effects can be more intense if you start too high
This dependency can make deficiencies more common, especially in individuals with restrictive diets, such as vegetarians or vegans, as B12 is primarily found in animal-based foods
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