Citrulline has been widely publicized by some news platforms because of its whitening and freckle-removing effect, which makes people mistakenly think it is a medicine or a health care product. But in fact, it doesn't have the "police mobile unit" logo (the unique logo of health care products in China) and the "OTC" logo (the logo of over-the-counter drugs that people in China can buy by themselves), so it is not a medicine, nor a health care product, but an ordinary food.
Food has no specific health care and treatment function, and can't effectively regulate body functions. The main function of food is to supplement the nutrients and energy needed by the body, such as protein, fat and carbohydrates. Therefore, the whitening and freckle removing effect of citrinin is still unclear.