Safety & interactions
B-complex formulas vary widely. Excess vitamin B6 can cause neuropathy, niacin can cause flushing or liver injury, and folic acid can mask vitamin B12 deficiency.
Vitamin B complex supplies a nutrient or bioactive compound intended to alter a defined physiological pathway. The relevant form, baseline status and product quality determine whether the proposed mechanism is clinically meaningful.
Purpose, evidence and practical considerations.
B-complex formulas vary widely. Excess vitamin B6 can cause neuropathy, niacin can cause flushing or liver injury, and folic acid can mask vitamin B12 deficiency.