Dha (Docosahexaenoic Acid, omega-3) is a building block for the cell membranes that manage life processes. This vitamin-like nutrient and its metabolic derivatives are vital to mental performance, heart and blood vessel health, vision, immunity, and many other functions. Doctor's Best Nutrition Dha from Algae is plant sourced Dha, prepared from toxin-free, sustainably cultured algae and is suitable for vegans.