Niacinamide is a water-soluble vitamin, or vitamin PP, which has good whitening effect and is contained in many cosmetics. After taking niacinamide, it can prevent melanin deposition and interfere with the connection channel between keratinized cells and melanocytes in order to reduce melanin, thus achieving a good whitening effect. However, beauty seekers need to use it for 1-2 months to work. Generally, it is not recommended for beauty seekers to take niacinamide tablets for a long time. If you want to whiten your skin with niacinamide, you can also get it through your daily diet in addition to taking medication. In daily life, meat foods contain a lot of niacinamide, such as lamb, beef, animal liver, tuna, eggs, dairy products, etc. Vegetables also contain niacinamide, such as tomatoes, carrots, potatoes, cauliflower, etc. It should be noted that some people cannot tolerate niacinamide tablets and experience redness, swelling, heat, pain, as well as itching, pain and other allergic manifestations after use. However, this condition is prone to occur in cold and dry conditions.