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Oral Supplements: Absorption varies widely due to digestive factors
This is key for those with vitamin B12 deficiencies
While vitamin B12 naturally occurs in the body, making allergic reactions to it exceedingly rare, certain additives or preservatives in some preparations could cause mild localized reactions, such as redness or itching
If you have digestive issues, the injection bypasses the digestive system, and the vitamin starts working immediately
Children below ten years should not inject themselves
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