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Vitamin B12 deficiency is a medical condition resulting from a lack of vitamin B12

the agency cited concerns over potential immune reactions, manufacturing impurities, and a lack of human safety data

This material is sold for laboratory research use only it is not a drug, food, cosmetic, or dietary supplement, and it is not intended for human consumption, therapeutic use, diagnostic use, or veterinary use

This was best summed up in a BMJ editorial last year, which noted that diagnosing B12 deficiency can be "challenging" because no "single specific measurement exists to reliably diagnose or refute the presence of B12 deficiency"