Lifeplan B12 Sublingual Tablets contain 1000mcg of Vitamin B12 (cyanocobalamin) that supports energy metabolism. It also contributes to the normal functioning of the nervous system. As it is found predominantly in animal foods, vegetarians and vegans often take a B12 supplement. This tablet is sublingual, meaning that it dissolves under the tongue for quick absorption. As it is found predominantly in animal foods, vegetarians and vegans often take a B12 supplement. This tablet is sublingual, meaning that it dissolves under the tongue for quick absorption. Suitable for vegetarians & vegans.