Platelet which is available in blood (i.e. thrombocytes) creates wound recovering, repairing and regenerative effect in the body. The main purpose of PRP is to benefit from this effect of thrombocytes. The aim of PRP applied on hair is to re-feed hairy tissue by using own cells of people. As it is known that thrombocytes in the blood has an encouraging effect to product collagen, it is benefited from this feature of thrombocytes in PRP treatment. Its security is most known between hair therapies.