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The NHS confirmed that people are usually given once-daily injections every other day for two weeks to help combat a vitamin B12 deficiency
This side effect is usually temporary
Serious Complications (Very Rare): Extremely rare but possible severe side effects can include congestive heart failure in individuals with certain heart conditions, or polycythemia vera (a blood disorder)
Allergies to vitamin B12 are extremely rarerarer than common allergies like bee stings, peanut butter, or shellfish
Your body cant make vitamin B12 on its own
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