I just watched this Dr usama syed, video title above, just thought someone might be interested in, in it he says, he went to make a cream to sell, and was ask do you want clinical level, cost more with proven results, or marketing level ( which is mostly what we see on the shelves) cheaper to make, and you only have to put a tiny bit of retinol, vitamin c, whatever, which does nothing, it was so interesting , he even tell you what to look outfor on the label, nice to see a view of what really goes into some skincare.