fish oil is extracted from cold water fish and is a natural source of marine omega -3 fatty acids.fish oil provides an anti -inflammatory action within the body which may reduce inflammation and joint swelling .omega -3 fatty acids are also imporant for cardiovascular health ,in addition to these benefits,blackmores fish oil 1000 is an ideal supplement to take if you can’t manage the recommended2-3 serves of fish a week.it is also high in dha which is necessary for the normal function of the brain and nervous system.to ensure you can take blackmores fish oil 1000 with confidence,blackmores regularly tests its fish oil for mercury and only uses high quality fish oil without added artificial surfactants to disguise fishy odours.