Pregnancy DHA is generally recommended to start taking in the second trimester of pregnancy, but if you usually pay better attention to your diet and have sufficient nutritional intake, then you can also do without additional DHA supplementation. DHA is a kind of unsaturated fatty acid, and its role is to promote the neural growth and development of the fetus. Generally speaking, the synthesis and conversion rate of this substance in the body is relatively low, so it needs to rely on external intake. Therefore, if the dietary intake is insufficient, after the third trimester of pregnancy can be supplemented with DHA, because at this time, the fetus has entered the critical period of neurological differentiation and development. At the same time, according to the latest clinical research, if the body during pregnancy to maintain a more appropriate level of DHA, is conducive to improving the outcome of pregnancy, reduce the incidence of maternal postpartum depression, improve personal immunity. However, it should be noted that DHA should not be used in excess, and should be used under the guidance of a medical professional.