Sentinel B-12 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 B-12 is particularly important for vegetarians, vegans, older adults, and those with absorption issues. The 500 mcg dosage is a common supplemental amount that can help maintain adequate B-12 levels. The supplements come in a dark amber bottle to protect from light degradation and include a safety seal cap. As with any supplement, consult with a healthcare provider before starting use.