Vitamin B12 shots, which go by the generic name cyanocobalamin and hydroxocobalamin are often administered to treat or B12 deficiencies as a supplement for patients who require higher levels of the vitamin due to a chronic illness. While there are rarely any side effects to taking oral doses of vitamin, some people may experience adverse reactions to injections of vitamin B12.
When the B12 shot is administered to a newborn baby in the first months of his life, the baby may have an adverse reaction to benzyl alcohol, a preservative that is contained in the injection of vitamin B12. Symptoms of adverse reactions include a slow heartbeat, low blood pressure and suddenly out of breath. The risk of an adverse event is even higher if the child has a low birth weight, and it can sometimes lead to death. Ideally, the baby should be given a shot B12 that does not use benzyl alcohol as a preservative.
From:http://natural-food-additive.com/additives/Vitamins/Hydroxocobalamin/
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