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pills vs injections b12 Vitamin C Shots or Shots: What You Should Know Vitamin B-12 Injections Vs Oral
Description
1 and 2)

(More information) The long-term use of certain medications, such as inhibitors of stomach acid secretion and the anti-diabetes drug, metformin, can adversely affect vitamin B 12 absorption

In addition, it is one of a few antihyperglycemic agents associated with improvements in cardiovascular morbidity and mortality, which is a major cause of death in patients with type 2 diabetes

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Not currently listed on the WADA Prohibited List as of 2026