Hyaluronic acid is a substance that naturally occurs in the skin. When this substance is injected, it is extremely well tolerated by the skin. The possible side effects of a treatment with Profhilo® are mild swelling, redness and sometimes a couple blue spots. These are more likely to be caused by the injection rather than the product itself and will vanish soon.
Profhilo® has been on the market since 2015 and has been used ever since on a worldwide scale. There have not been any reports of other side effects than the ones mentioned above which is due to the fact that the product contains a highly pure form of hyaluronic acid.