DHA, scientific name docosahexaenoic acid, exists in cerebral cortex, retina and other tissues. It is an important structural substance for brain function (including intelligence) and visual development. This element is active in nature, and it is particularly easy to be oxidized, thus producing the fishy smell of amine substances with strong fishy smell. The fishy smell is not a sign of adding DHA; On the contrary, fishy smell is a signal of oxidative deterioration of DHA. A few days ago, the US Food and Drug Administration approved the application to add DHA to baby food. Recently, however, scientists in the United States have found that DHA milk powder with fishy smell is not suitable for eating, which is contrary to many people's thinking-many people think that DHA is mostly found in marine life, such as deep-sea fish and some algae, and baby milk powder containing DHA should have fishy smell.