Some individuals may have problems producing this protein due to genetics, age, chronic gastritis, autoimmune conditions, or bariatric surgery
However, dietary supplements, while recommended in some cases, cannot replace a healthful diet. The Dietary Guidelines for Americans describe a healthy diet as one that: Emphasizes a variety of fruits, vegetables, whole grains, and fat-free or low-fat milk and milk products: Milk and milk products are good sources of vitamin B12
The limited human evidence includes: A randomised double-blind placebo-controlled Phase 2 enema trial in ulcerative colitis with 53 participants, published only as a meeting abstract
Potential Side Effects of B12 Shots Although it is rare some people can have some mild to more severe side effects from vitaminB12 shots
Initial assessment and diagnosis: Patients concerned about B12 deficiency should first consult their GP