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.
My eyes react badly to eyeliner and kohl usually - I have no such allergy problems with this product. It is also soft so goes on smoothly and can be deliberately smudged, but then 'dries' so I don't end the day looking like a panda bear. My eyelids are 70yo, so a smooth finish is no mean feat. 😊