Vitamin B12
Vitamin B12 is a nutrient that the body needs in small amounts to function properly. It is involved in the metabolism of every cell in the human body, playing a key role in the synthesis of DNA and maintenance of the nervous system. Unlike many other vitamins, B12 is not produced by the body and must be obtained through diet or supplements.
Source: https://theamberpost.com/post/....understanding-the-vi