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.
It works, I don't really know how else to describe it. Comes sealed in plastic - not even the supermarket has them sealed in plastic (individually). Couldn't fault the price, extremely cheap on sale, cheaper then any supermarket. Had to buy 3 as a minimum, but that's understandable after-all they are small bottles.