Vitamin B-100 Sustained Release, 100 Tablets, NOW FoodsNOW Foods B 100 Sustained Release Dietary Supplement. Nervous System Health. B Complex for Maximum Effectiveness. Supoorts Energy Production. Vegetarian Vegan. B 100 Tabs provide a full complement of B Vitamins plus Choline and Inositol. Together, these vitamins work to support energy production, are critical for the healthy metabolism of homocysteine, and promote a healthy nervous system. B Vitamins are water soluble, and with the exception of B 12,