This is a nice little set. Especially great as a starter-set for someone that doesn't have many serums. The retinol and vitamin C are nice. However, hyaluronic acid is in SO many products now, that I'm not sure a designated serum is necessary, at least it isn't for me. I use the retinol at night and the vitamin C in the morning. I never use them at the same time and I'm always careful to use sunscreen during the day. This set is nicely priced and made in the USA. Paraben free, fragrance free, and cruelty free, which is a must for me!