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A healthcare professional should administer your first shot so they can monitor your reaction and check for any adverse effects
It is listed as a rare adverse reaction in UK product information for both oral and injectable B12 preparations, and most people tolerate B12 supplements well even at high doses
Research suggests that megadoses of two milligrams per day are safe for correcting a vitamin B12 deficiency
Folic Acid : Vitamin B12 injections may interact with folic acid, a B vitamin essential for the production of red blood cells
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