Vitamin B12 is an important nutrient found in meat, fish, and dairy products. It may also be manufactured in a laboratory and is frequently combined with other B vitamins. Many components of the body, including the brain, nerves, and blood cells, require vitamin B12 for proper function and growth. The active form of vitamin B12 is methylcobalamin. The most frequent kind used in supplements is cyanocobalamin, which must be converted by the body into an active form. Vitamin B12 is widely used to treat vitamin B12 deficiency, cyanide poisoning, and excessive blood homocysteine levels. It's also claimed to treat canker sores, cataracts, Alzheimer's disease, osteoporosis, weariness, and a variety of other ailments, although most of these claims lack scientific backing. The B vitamin B12 is very significant. It is necessary for nerve tissue health, brain function, and red blood cell synthesis. Vitamin B12 is also known as cobalamin. When vitamin B12 levels are insufficient to satis