B-complex vitamins are nutrients that the body needs in small amounts (micronutrients) for metabolism, energy production and overall health of cells, skin, bones, muscles, and the nervous system. They are absorbed from food, used according to the needs of the body and any excess is excreted from the body through the urine.

Because B vitamins are water soluble, only small amounts can be stored in the body and should be taken on a regular basis from foods rich in B vitamins or supplements.
B-vitamin deficiencies are more common in people with malnutrition and malnutrition, in chronic alcoholism, in people with malabsorption or other digestive disorders, celiac disease, inflammatory bowel disease, and in the elderly. and other vitamins, there may also be multiple symptoms.

The most common symptoms of insufficiency include skin rashes or dermatitis, inflammation of the tongue, numbness, tingling or hallucinations in the hands or feet, anemia, fatigue, and mood disorders.

Although they can be taken individually, the way they act on the body is commonly linked (eg B12 is a prerequisite for the action of folic acid on red blood cells). For this reason, it is considered more complete to take the whole complex to meet daily needs.