1. What is DHA? DHA (Docosahexaenoic Acid) is an important Omega-3 fatty acid, which is one of the most important brain and retinal components in the human body. DHA also helps maintain cardiovascular health, reduce inflammatory responses, and more. 2. Why do pregnant women need DHA? Pregnancy is a critical period for fetal brain development. Adequate DHA intake can promote fetal brain and vision development.