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Zahler's B Complex-Sustained-Release Potent formula. It contains all eight B vitamins in addition to important related nutrients. The B Complex vitamins are essential to almost every aspect of body function, including metabolism of carbohydrates, amino acids, fats, and energy production. The mouth, eye, skin, hair, muscles, liver, nervous system, and more are all impacted by B vitamin intake. Because most B vitamins are water-soluble and a continuous supply is required, the Zahler sustained-release formula ensures that these beneficial nutrients stay in your system longer.