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Nat Rul B Complex supplies all eight B vitamins. The B vitamins are interdependent upon each other and best used together. B vitamins are water-soluble and must be replenished daily as excess is excreted in the urine.Features: Nat-Rul B Complex supplies all eight B vitamins. The B vitamins are interdependent upon each other and best used together. B vitamins are water-soluble and must be replenished daily as excess is excreted in the urine. B Vitamins support metabolism including increased metabolic rate.