PLA + HA Hybrid Filler. Firstly, Etrebelle is a collagen stimulator made with biodegradable PLA (Poly D, L-lactide) microparticles and Hyaluronic acid. Soft tissue injectable implant. Secondly. HYBRID FILLER OF PLA (POLY LACTIC ACID), MICROPARTICLES AND HA (SODIUM HYALURONATE).