To calculate the overall star rating and percentage breakdown by star, we don’t 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 analyzes reviews to verify trustworthiness.
One thing that could be improved: it really hard to remove the pellicule to have access to the product. The other thing: I have fair skin (red head) and it’s hard to remove the patch without having sore skin. But it works so well with the healing process.