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NOW: B-100 Sustained Release Tablets. PRODUCT DESCRIPTION Maintains Good Health Helps in tissue formation Helps metabolize proteins, fats, carbohydrates Sustained Release High potency 100 mg B Complex Water-soluble B vitamins are not stored in the body and must be replenished daily. This is NOW®’s highest potency, multiple B-vitamin product in a sustained-release format and is designed to provide consumers with the required daily intake in one complete supplement. Formula provides 100 mg of the majority of the B-Complex vitamins. Our sustained release forduct helps deliver nutrients over a period of 2 hours, and mimcs the process of normal digestion. Our sustained release process does not involved chemical coatings typical of other time release products.