Leukocyte-platelet rich fibrin (L-PRF) is extensively used in the dentistry field and other clinical scenarios due to its regeneration properties. the goal of the present study was to depict the L-pRf secretome and how it changes over time. We obtained L-PRF membranes and cultured them in DMEM. The secretome was collected at days 3, 7 and 21. The secretome at day 3 was analysed by LC-MS/ MS and differences over time were analysed by Sequential Window Acquisition of all Theoretical Mass Spectra (SWATH). Overall, 705 proteins were identified in the secretome of L-PRF membranes after 3 days of culture, including growth factors (EGF, PDGFA) and proteins related to platelet and neutrophil degranulation. A total of 202 differentially secreted proteins were quantified by SWATH when comparing secretomes at days 3, 7 and 21. Most of them were enriched at day 3 such as MMP9, TSP1 and CO3. On the contrary, fibrinogen and CATS were found down-regulated at day 3. Growth factor and western blotting analysis corroborated the proteomic results. This is the most detailed proteome analysis of the L-PRF secretome to date. Proteins and growth factors identified, and their kinetics, provide novel information to further understand the wound healing properties of L-pRf. In the last two decades, the use of platelet-rich concentrates (PRC) has become very popular in different fields, especially in dentistry, due to their regeneration properties. Different scientists and companies have developed methods to obtained PRC with presence or absence of leukocytes but all of them with addition of anticoagulants to the tubes. In 2001, Choukroun et al. developed the second generation of PRC, Leukocyte platelet rich fibrin (L-PRF) 1 , which is obtained by blood centrifugation without anticoagulant in the tubes. Nowadays, L-PRF is the most commonly used PRC since it is easy to obtain and can be applied as a gel or compressed into a membrane depending on the application site. It has been mostly used in a dentistry field, especially for the treatment of osteonecrosis 2,3 , implant placement in bone-deficient sites 4 and sinus floor elevation 5. Additionally, L-PRF has started to be used in other clinical scenarios, for example for the treatment of chronic wounds, leg ulcers or diabetic foot 6 or for the treatment of ocular lesions 7. Wound healing is a complex process, which encompass different phases: haemostasis, inflammation, proliferation and remodelling. In each phase, different cell types take part in order to regenerate the tissue. Two types of blood cells, platelets and leukocytes, are among the cells that participate first. Growth factors, cytokines and other proteins released by these blood cells have chemoattractant properties that contribute to wound repair 8-10 .