Kosmetische Zusammensetzung zum Füllen von Volumen, wobei die Zusammensetzung mindestens 0,1 Volumenprozent Thrombozyten aus thrombozytenreichem Plasma umfasst, Rest Wasser, Zusätze, Stell- und Hilfs-Stoffe und unvermeidbare Begleitstoffe, sowie Vorrichtung zur Herstellung der Zusammensetzung und kosmetisches Verfahren unter Verwendung der Zusammensetzung.Cosmetic composition comprises at least 0.1 vol.% thrombocytes from platelet rich plasma, balance of water, additives, excipient and auxiliary substances and unavoidable impurities. Independent claims are also included for: (1) a device for preparing the composition, comprising apparatus for obtaining a platelet rich serum, a venous cannula and an outflow-side receiving container, where the receiving container is formed at least to separate the platelet rich serum and (2) cosmetic process for volume replacement under stabilization of connective tissue, comprising applying and injecting an endogenous platelet-containing composition in the weak connective tissue region of the skin of the same body.