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[9] Visual disturbances have been reported in patients with Leber hereditary optic neuropathy, and rapid B12 administration may precipitate optic nerve atrophy in this genetically predisposed population, mandating extreme caution or alternative therapy

Seek emergency care for difficulty breathing, facial swelling, chest pain, or severe allergic reactions

Vitamin B12 injections Vitamin B12 plays an important part in maintaining normal functioning in the brain and nervous system

Some bruising may occur and will resolve on its own - this is particularly common for people taking blood thinners or those with more delicate skin

(11) Studies have examined the compounds bioavailability following various routes of administration and its tissue distribution patterns