DHA - Omega 3DHA is an Omega 3 fatty acid. The body can produce DHA from the essential fatty acid ALA, this conversion depends on a rate limiting step which varies in efficiency from person to person. It is thought that the conversion is especially efficient in infancy. DHA is found in high concentrations in breast milk and in cold-water, deep dwelling algal-eating fish. The grey matter in the brain and the retina of the eye contains high concentrations of DHA.