Actually, lip augmentation procedure complication rates are very low if it is carried out by experienced physicians. Moreover, using FDA-approved fillers in Istanbul is important too. Most doctors prefer hyaluronic acid-based fillers to collagen-based fillers due to their long-lasting effect and lower complication rates.   There is a 1-3% chance of an allergic reaction with collagen-based fillers. However, the rate of allergic reactions in hyaluronic acid-based fillers is extremely rare. Another advantage of HA-based fillings is that they can be extracted back in cases where the patient is not satisfied or complications are seen. In conclusion, in a situation where any complication occurs, the filler can be instantly removed from the lips.