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Studies have examined how these metabolic changes affect various cellular processes including energy metabolism and gene expression
Vitamin B12 side effects Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says
"Elevated serum homocysteine, low serum vitamin B12, folate, and age-related macular degeneration: the Blue Mountains Eye Study"
Before you start taking folic acid, your GP will check your vitamin B12 levels to make sure they're normal
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