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Key factors to consider: The severity of anemia Presence of other B12 deficiency symptoms Patients dietary habits and nutritional status Neurological Symptoms and Cognitive Effects B12 deficiency can cause serious neurological symptoms like numbness, tingling, and brain problems

For those with absorption issues, the B12 injection is a great fix because it bypasses the digestive system, which is likely where your absorption issues originate

Edward Rubin, MD board-certified in Pain Medicine and Anesthesiology, with fellowship training at Cornell, Columbia, Hospital for Special Surgery, and Memorial Sloan Kettering

There are other peptides that reside in kind of a gray market area