Vitamin B12 2500 mcg Sublingual Tablets, 100 ct, QC99863 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Vitamin B-12 (Cyanocobalamin) supports the body's nerves and blood cells. Energy supports tissue growth, circulatory, and nervous system health. No added salt, yeast, preservatives, artificial flavors or colors, and gluten-free.