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B12 is absorbed well from the fatty layer, so the vitamin reaches the bloodstream either way
Rosen says
Scientific References Frequently Asked Questions Can taking too much vitamin B12 be harmful
For example, a typical starting regimen may involve 1000 mcg (1 mL of a 1000 mcg/mL solution) given intramuscularly or subcutaneously on a daily or several-times-weekly basis for one to two weeks
If this occurs, slight dose adjustment (increasing by 50mcg if not already at 500mcg) may help
Coeliac disease can present as a skin rash called dermatitis herpetiformis (DH)
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