Vitamin B12 is what is known as an essential nutrient. That means two things: First, an essential nutrient is a chemical ...

Initial symptoms of vitamin B12 deficiency, such as fatigue, nausea, and loss of appetite, are often basic and remain ...

However, they only work well if you have a vitamin B-12 deficiency. When this happens, you might experience fatigue, tiredness and become cranky. Proper vitamin B12 levels from food or ...