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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
"Vitamin B 12 in the Vegan Diet"
PMID 5675428
In the United States, it is only available legally from pharmacies by prescription from a licensed health care provider
Cycling theoretically prevents tolerance and allows natural enzyme function to reset
Insert the needle at a slight angle through the stopper
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