What is PLACL? Polylactic acid (PLA) from corn starch is a new 100% biodegradable polymer material made by Melting Blending and Ring-opening polymerization of caprolactone (PLC). BIOREJU PLACL is a technique used to treat signs of aging in the face and body area. In this technique, PLLA molecules are shaped into a special shape and injected under the skin and provide support to ensure the restructuring and rejuvenation of the skin.