Dietary SupplementWith ISR TechnologyDual Action Tablets. Caffeine Free. Stimulant Free. Tested for Optimum Purity & Potency. Suitable for Vegetarians. Nature's Bounty Dual Spectrum B-12 is an innovative way to support energy by converting food into energy. Each bi-layer B-12 tablet features ISR technology, a scientifically engineered transmission system that offers the benefits of both immediate and sustained release (ISR). Each tablet has two distinct layers - one to deliver effective, quick release, and one designed to release B-12 in your body over the course of several hours..when you need it most!Dual Spectrum B-12 is free of caffeine and other stimulants - each tablet provides you with high potency Vitamin B-12 to support your energy metabolism. B-12 is also an essential nutrient for nervous system health. So get the support you need from two ends of the spectrum, with Dual Spectrum B-12 from Nature's Bounty!No Artificial Flavor or Sweetener, No Preservatives, No Sugar, No Starch, No Milk, No Soy, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.