I ordered this in 2020 after seeing Redditors saying it was their "holy grail" anti-dandruff shampoo. Was initially hesitant to buy due to the price tag but bought it anyway. I've been using this since I bought it in 2020 and it is indeed the best - the only - effective anti-dandruff shampoo for me. The bottle also lasts a long time, even if you double or triple cleanse, since you don't need that much product.