Vitamin B12 is a nutrient commonly found in animal-based foods, so individuals who follow a vegetarian or vegan diet may be at a higher risk for Vitamin B12 deficiency
Individuals with digestive system conditions including Crohns disease, celiac disease, or a history of gastrointestinal surgery often have difficulty absorbing B12 orally, regardless of diet
Off / washout (after the block): A typical research framing runs a defined block (commonly 812 weeks) followed by an off period before any subsequent block, rather than indefinite continuous use because long-term human data simply do not exist
As with vegetarians, vegans can avoid this by consuming a dietary supplement or eating B 12 fortified food such as cereal, plant-based milks, and nutritional yeast as a regular part of their diet
Experience slow metabolism or difficulty losing fat
Coverage Code D reflects this special-instructions status