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Riboflavin (vitamin B) is light-sensitive and can degrade with exposure to sunlight or strong UV light, which may reduce the vitamin content and cause the solution to darken

The AAFPs evidence-based clinical review states directly: Oral administration of high-dose vitamin B12 (1 to 2 mg daily) is as effective as intramuscular administration for correcting anemia and neurologic symptoms in patients with B12 deficiency (Langan RC, Goodbred AJ, American Family Physician, 2017)