Which vitamin is known as cobalamin?

Cobalamin is the chemical name for Vitamin B12, which is essential for several bodily functions such as DNA synthesis, red blood cell formation, and neurological function. This vitamin is particularly important for the production of myelin, the protective sheath around nerves, and for maintaining healthy nerve cells. A deficiency in Vitamin B12 can lead to significant health issues, including anemia and neurological conditions.

This particular vitamin is unique because it contains cobalt, which is reflected in its name—cobalamin. It's primarily found in animal products such as meat, fish, eggs, and dairy, and is crucial for vegetarians and vegans to monitor, as they may not obtain enough of it through diet alone.

In contrast, the other choices listed are associated with different vitamins: Vitamin B1 is thiamine, Vitamin B9 is folate, and Vitamin B3 is niacin. Each of these vitamins plays distinct roles in the body, but cobalamin specifically refers to Vitamin B12, making it the correct answer to the question.