Hello, Tongren healthy polyene fish oil is pure natural deep-sea fish oil, and does not contain any preservatives or artificial pigment additives. It is rich in unsaturated fatty acids -DHA and EPA. DHA and EPA are helpful to lower cholesterol, prevent cardiovascular diseases, prevent blood coagulation, prevent thrombosis, reduce arteriosclerosis and hypertension, reduce blood viscosity, promote blood circulation and eliminate fatigue. Can be taken for a long time without any side effects.