To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I noticed a difference in my skin with just one use. Just one! Now I've tried a lot of things for the redness in my face and all have worked to some degree or another but never in just one use. I will be buying more in the future.