How to Use Step 1. Cleanse your face and gently pat your skin dry before applying The Ordinary GF 15% Solution - 30ml. Use this serum after cleansing and before heavier skincare products such as moisturisers, creams or facial oils. Step 2. If you are using The Ordinary GF 15% Solution - 30ml for the first time, perform a patch test before applying it to your face. Apply a small amount to a discreet area and check for any signs of irritation before regular use. Step 3. Apply a few drops of The Ordinary GF 15% Solution - 30ml to your face and neck using clean fingertips. Avoid direct contact with your eyes. Step 4. Gently smooth the serum over your skin and allow it to absorb before applying your next skincare product. Do not rinse off. Step 5. Follow with a moisturiser to complete your skincare routine. Apply moisturisers, creams or facial oils after the serum. Step 6. Use the serum morning and evening as part of your skincare routine, or as directed. Step 7. If using the serum in the morning, apply a broad-spectrum sunscreen as the final step of your skincare routine before makeup or sun exposure. Step 8. Avoid using this serum in the same routine as direct acids, direct vitamin C products or retinoids unless advised by a skincare professional. Alternate products between routines if needed. Step 9. Close the bottle securely after each use and store it in a cool, dry place. If irritation occurs, discontinue use and seek advice from a healthcare professional if needed.