Food sources
 Milk and dairy products, animal liver and kidney, egg yolk, eel, spinach, carrots, brewing yeast, mushrooms, seaweed, eggplant, fish, celery, orange, tangerine, orange and so on.

 People in need
 1, taking birth control pills, pregnancy, breast-feeding women need to be more and more vitamin B2;

 2, do not eat meat and dairy products shall increase vitamin B2;

 3, a long period of stress state who need to supplement.

 Replenishment cycle
 A small amount to stay within the human body, so be replenished daily.

 Deficiency
 Lack of vitamin B2 can cause mouth, lips, skin, genital inflammation and dysfunction, known as riboflavin deficiency.

Vitamin B2 deficiency:

1, resulting in seborrheic dermatitis (eyes, nose and nearby skin and fat excess and there dander hard crust);

2, causing the lips red, stomatitis, inflammation of the lips, angular stomatitis, glossitis, leading to oral ulcers;

3, the bloodshot eyes, easy tears, tend to have a sense of fatigue, dizziness, causing conjunctivitis;

4, causing vaginal itching.

 Overexpression 

 Excessive intake may cause itching, numbness, nosebleeds, burning sensation, tingling, and so on. If you are taking anti-cancer drugs, such as methotrexate (methotrexate), then B2 will reduce the excess of these anticancer effects.