Sentinel B12 is a dietary supplement containing 500 micrograms of Vitamin B-12 per tablet, with 100 tablets per bottle. This essential nutrient supports red blood cell formation, DNA synthesis, and proper nervous system function while helping maintain healthy energy levels. Vitamin B12 is particularly important for vegetarians, vegans, older adults, and those with absorption issues. The supplement comes in an amber bottle with a safety seal to protect the vitamin from degradation. The 500 mcg dosage is a common supplemental amount that can help maintain adequate B12 levels when taken as directed. As with any supplement, consult with a healthcare provider before use.