Vitamin B-3
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VITAMIN B-3, NIACIN, NIACINAMIDE, NICOTINIC ACID

Thyroidal function: Facilitates copper metabolism and therefore slows thyroidal function. Supplementation with B-3 without copper may deplete copper and facilitate the development of hyperthyroidism.

Other functions: Precursor of serotonin and therefore critical for control of schizophrenia and bipolar disorder.