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 started with the small bottle before I bought the 1lt, I like the product and noticeably that my hair is healthier and fall less. Great product for my hair and a better price with great saving. Speedy Delivery awesome. Highly recommended to everyone