Vitamin B1: causes anorexia in the early stages. Prolonged deficiency of thiamine causes Beriberi disease. Alcoholic patients with chronic thiamine deficiency may have central nervous system manifestations.
Vitamin B2: Riboflavin deficiency is rare in humans. The most common symptom of riboflavin deficiency is paleness of the mucous membrane, sores at the corners of the mouth. Decreased visual acuity, dry and burning eyes, cataracts, inflammation of scleral vessels.
Vitamin B3: Vitamin B3 deficiency is rare in humans. Symptoms of vitamin B3 deficiency include numbness of the big toe, myalgia (extreme fatigue), fatigue, headache, insomnia, intestinal dysfunction, paresthesia of hands and feet, and antibody production disorder.
Folic acid (vitamin B9): In the early stages, the blood level of homocysteine may increase. As a result of continuous deficiency of folic acid, megaloblastic anemia occurs.
Vitamin B12: Vitamin B12 deficiency initially manifests as anemia and neurological changes. As a result of vitamin B12 deficiency, pernicious anemia (dangerous) occurs.
Pernicious anemia is a type of megaloblastic anemia caused by the reaction of the body’s defense system against the cells of the stomach wall. The cells of the stomach wall secrete intrinsic factor, which is necessary to absorb vitamin B12 from food. Therefore, the destruction of cells Stomach wall causes the lack of intrinsic factor and as a result, decreased absorption of vitamin B12.
Vitamin C: severe deficiency of vitamin C causes scurvy and is associated with bleeding manifestations and dysfunction of the immune system.
Vitamin H (Biotin): Some symptoms of biotin deficiency include dry and scaly skin, anorexia, seborrheic dermatitis, conjunctivitis, and neurological disorders.