Ole Henriksen's Truth Serum Vitamin C Collagen booster. Retail $48. I've never used nor heard of this brand before but the Sephora lady gave me some samples and I loved it! I tried Boscia's serum but it didn't feel like it was doing anything which was unfortunate since I freakin' love their Luminizing Black Mask. This Vitamin C Serum smells so good and feels amazing on the face. Too expensive for my taste ($50 for such a small bottle!), so most likely I'll look for a different "go-to" face serum. But I do recommend it!