All Miriam Quevedo products are formulated to avoid allergic reactions and undergo testing by independent laboratories under dermatological supervision. If you have very sensitive skin and have experienced skin reactions when using cosmetics before, you can do a simple test: apply a small amount of the product to the inner forearm and leave it on for 24 hours. If you notice redness or any sign of reaction, the product may contain an ingredient that your skin does not tolerate. In that case, use is not recommended.