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There may be moderate side effects, such as mild discomfort at the injection site
Theres yet another serious issue that B12 deficiency causes and thats accumulation of homocysteine and methylmalonic acid in the blood but it doesnt produce any specific symptoms a blood test would be able to reveal these issues (EFSA, 2015
benzyl alcohol has been associated with serious adverse events (the gasping syndrome) in newborns and must be avoided in this population
Lets break it all down clearly and without fluff
The convenience of a fixed blend is also its limitation
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