Well, no. It clearly provides self-reported testament that it helps. But if you believe that, then 9/10 women found shampoo/moisturiser to improve their shine

Well, no. It clearly provides self-reported testament that it helps. But if you believe that, then 9/10 women found shampoo/moisturiser to improve their shine/visibly fade wrinkles! /that is to say, self-reported testaments and improvements have historically been the chosen method of snake-oil because placebo and self-dellusion are so powerful. There does not appear to be robust evidence that it works at all yet.