Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Love this product. Best facial cleanser I have ever used. Bought myself one from a department store which was considerably more expensive. Found it on Amazon much cheaper and have purchased 3 more for friends. You won’t be disappointed. Delivery took much longer though than was informed by Amazon.