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.
I normal use Hydra Energetic Pure moisturiser but accidentally ordered this. Used couple of times and found it to be irritating to my eyes for prolong period. Had to was off couple of times. Not sure if may be just me.