Cod liver oil cannot cleanse blood vessels. The main components of cod liver oil are vitamin A and vitamin D, which are used to treat diseases such as vitamin A and vitamin D deficiency, but have no significance for the protection of blood vessels and the endothelium of blood vessels. When vascular sclerosis or atherosclerosis occurs, the best treatment is to target the causes, such as smoking, hypertension, hyperglycemia, hyperlipidemia and obesity. Controlling the above factors and eating a healthy diet, it is recommended to take into account the composition and proportions of the Mediterranean diet with a total calorie count, and to exercise actively in general, when the blood vessels can be in optimal condition and the process of atherosclerosis can be very slow.