Excellent retinol because you can't go wrong with the quantity. My skin accepted it very well, but it causes dryness, especially for me who has dry skin in the winter, so it needs a very good moisturizing cream afterwards. I apply it at night after washing and drying my face well, and then I apply a very moisturizing cream like Cerave or Uriage Xemose for very dry skin and eye cream. I wait for about an hour before lying down, and in the morning I'm fine. It takes a long time to see the results, and at first, when I didn't use a very moisturizing cream (too greasy), it made some expression lines more pronounced. It requires persistence and not being scared, and a very good moisturizer afterwards! From what I researched, retinol shows its results after 3-4 months. Because my skin accepted it, I use it almost every day or every other day, otherwise, you can apply it once or twice a week initially. I have heard great things about retinol from dermatologists. We are waiting