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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
Serious reactions are very uncommon
In pernicious anemia, holotranscobalamin decreases whereas in dietary deficiency, holotranscobalamin will remain relatively stable while total serum B12 decreases
A local pharmacy in Luton can advise whether pharmacy support is suitable or whether you should speak to your GP for blood tests and diagnosis
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