Brilliant serum, expensive, maybe, but allbeauty pricing  softens the blow and represents amazing value compared with regular sized serums as this  size lasts about 15 months used morning and night. It plays well with other brands which cannot be said for all premium brands when layering products. I love it; my skin looks wonderful and is so smooth and glowy. I’m 62 but I’m told I look 45. Thank you Allbeauty for making it possible to use good quality products, my little secret.