I've been wanting to try Alpha H for a long time now, so I decided to get the set of serums. I am beyond impressed. My absolute favorite of the group is the Vitamin B serum - my skin is glowy, hydrated and looks so refreshed. I also really enjoy the Vitamin A serum. I am new to retinol so I am very cautious and only want to use gentle versions. The Alpha H vitamin A is perfect for a beginning, I mixed it with my favorite moisturizer and applied to to clean, toned skin. Truly so impressed with this entire set and I will definitely be repurchasing!!!