The use of polylactic acid in cosmetology is becoming more and more popular. But what is this substance? How safe is it and how does it affect the skin? Which drugs deserve attention and trust? Maria Morzhanayeva, chief physician of the Skin Expert clinic network, cosmetologist, dermatologist, preventive medicine doctor, medical director and teacher at the International School of MicroNutrition, AestheFill trainer, answers to the main questions about polylactic acid.