Vitamin B-complex vitamins are an important part of the micronutrients found in a balanced diet. Vitamin B is a water-soluble vitamin. All B vitamins, B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 ...

Symptoms of vitamin B12, or folate, deficiency can include fatigue, lethargy, low mood, shortness of breath, and nerve problems. Treatment often involves dietary changes or vitamin B12 supplements.

If a person does not get enough vitamin B12, a doctor may suggest supplements containing more than the daily recommended dose. The body does not store excess vitamin B12, so taking extra is not ...