Purepharma o3 ultra pure fish oil each purepharma fish oil batch is tested by the most reputable and stringent third party testing lab ifos to ensure the highest purity safety cleanliness concentration and stability great for the heart epa amp dha have been shown to decrease triglyceride levels the growth rate of plaque that clogs blood vessels and lower blood pressure slightly great for the brain the human brain is extremely rich in dha as well as other omega 3 fatty acids su