self inject b12 Patients self-injecting vitamin without telling their GP, finds study Self-Administering B12 Injections: A Step-by-Step

For example, FDA labeling for cyanocobalamin injection includes contraindications (such as hypersensitivity) and important warnings (see the FDA prescribing information for cyanocobalamin injection )

Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery

William Castle demonstrated that gastric juice contained an "intrinsic factor" which when combined with meat ingestion resulted in absorption of the vitamin in this condition

KEEP OUT OF REACH OF CHILDREN INDICATIONS For use as a supplemental nutritive source of vitamin B12 in cattle, horses, swine, sheep, dogs and cats