Now Foods Vitamin B-100 Sustained Release is a high-dose B vitamin complex that combines the eight water-soluble B vitamins. The B vitamins have been combined with choline, inositol, and PABA (para-aminobenzoic acid), also known as vitamin B10. - HIGH DOSAGE: One dose, one tablet every 4 days - GOOD BIOAVAILABILITY: Suitable for a vegan diet - HIGH QUALITY: Subjected to quality and purity tests in independent laboratories - WITHOUT UNWANTED ADDITIVES: Gluten-free and non-GMO - IMPORTANT NUTRIENTS: Contains all the B complex vitamins, choline, inositol, and PABA, important nutrients that are involved in many processes of the human body