You can also go to the hospital or blood station to donate blood for free. There are many benefits of blood donation, which can enhance your hematopoietic function and speed up your blood renewal. In this way, you will be healthy, because your old cells are less, and new blood cells can transport oxygen well, and so on. Blood donation is also very particular. If you donate blood, you must be above 18 to donate blood. No infectious diseases, too thin to donate blood >