Allergic reactions, included rash, pruritus, and anaphylaxis have been reported with vitamin use.
Components of products have been associated with gastrointestinal effects such as heartburn, eructation, abdominal pain and cramps, diarrhea, vomiting, nausea and anorexia.
Hepatic dysfunction with abnormal liver function tests, including hyperbilirubinemia, has been noted.
Deterioration of acneiform vulgaris, or eruption of acneiform exanthema, has been noted with several components.
Bright yellow urine discoloration has been reported with riboflavin usage.
Niacinamide has strong vasodilator effects, most often characterized by flushing, dizziness or faintness.
Peripheral sensory neuropathies have been noted with usage of pyridoxine.
Stone formation, crystalluria and oxalosis, with ascorbic acid usage, have been reported in the literature.
Black discoloration of the stool has been reported with iron usage.
Isolated cases of injury to mouth and pharynx, esophageal ulcer, hematemesis and ileus have been reported.
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