Supplementary signals: frequent lip, tongue, mouth ulcers, blurred vision, seborrheic dermatitis, skin roughness. In addition, observing the color of the tongue can find out which kind of vitamin B. If the tongue is purplish red, it means the lack of vitamin B2; if the tongue color is strawberry red, it means the lack of vitamin B12. Suitable for: white-collar workers with heavy workloads and those who exercise a lot. Expert analysis: Vitamin B is an important substance that allows fat to be converted into heat. All B vitamins must work at the same time, a phenomenon known as the fusion of B vitamins. If one vitamin B is deficient, it affects the ability of other vitamins to function. Therefore, when there is a sign of deficiency of a particular vitamin B, it is a warning from the body that the patient needs to replenish it in time, otherwise the situation will continue to deteriorate. Excess Signs: All B vitamins are soluble in water, and even if there is an excess, it will be excreted in the urine. Therefore, vitamin B does not usually show signs of overdose. Foods rich in vitamin A: greens, potatoes, eggplant, pumpkin, bean sprouts, bananas, apples, fish, etc.