DHA is a long-chain omega-3 fatty acid that forms a major structural part of the brain and retina. Fish oil, krill oil, and algae oil all supply it. The triglyceride form absorbs better and causes less stomach upset than the ethyl ester form.
People take DHA to support memory, sharp vision, and a healthy heart. It concentrates in nerve and eye tissue, so many choose it over the closely related omega-3 EPA for those areas. Taking it with a meal that contains fat helps your body use it.
DHA can thin the blood slightly. Some users notice stomach upset or fishy burps.