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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 B6 is critical for protein metabolism, energy production, and normal nervous system function
Depending on the cause, testing, dietary advice, oral vitamin B12 or GP-led treatment may be more appropriate
This is a safer approach because your body's natural feedback system stays intact
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