I tell them to apply it to the middle of my face, and I asked my family which side they see me better, and they all said: the right side right where I had applied it, and told them in 5 minutes, I really recommend the product, and of course I will buy the 10 bottles. The face looks inflated, young, with vitality, it does not look drained. And I will continue to apply it to one side because I want to see the change.