Salmon Oil and GLA The EPA DHA in Salmon Oil and the GLA work as a team to promote a healthy balance of prostaglandin types in the human body. Salmon Oil is naturally rich in the important Omega-3's, EPA and DHA. GLA is an important Omega-6 component. Carlson Salmon Oil is extracted from salmon found in the deep, unpolluted waters of Norway. The GLA is derived from black currant seed oil. THIS PRODUCT is regularly tested using AOAC international protocols for potency and purity by and independent, FDA registered laboratory and found to be free of detectable levels of mercury, cadmium, lead, PCB's and 28 other contaminants.