This serum contains the exact properties of Retinol Serum but even stronger. More potent with 1% retinol (Vitamin A) for those who are serious about combating the signs of ageing and refining the skin. The addition of peptides makes this serum an effective alternative to collagen injections with serious plumping agents. After 4 weeks of use you will enjoy a most positive difference in your skins look and feel! Use at night to get full benefits. To use: Apply one pump to cleansed skin at night only. Tingling may be felt which is normal. Note: First time users may wish to build up use of Retinol slowly - to prevent a retinoid-response (a rare and harmless skin response where red, itchy bumps may appear temporarily on skin after use) - A suggested routine is... Use twice a week for the first week, Every second night for the second week. Every night by the third week onwards