bought the first time aphro Celina me 3 years ago and after a few months you could see a huge difference! In the beginning you have to it morning and evening use and it happened a long time nothing. But after 1 month you can see a clear difference and it begins to work! Meanwhile, I also use it for my eyebrows and 2-3 sessions a week are enough :) so has my old serum and maintained for 3 years: D Unbeatable for the price