I've just about exhausted my sample size, and am soon to re-purchase!
I have combination to oily skin, -- with CONSTANT breakouts -- so applying it does make my face appear as if a layer of water is on it, which does not alarm me as I use it during my night skin routine only.
I use this product as a prequel to my additional serums -- NUDE ProGenius Treatment Oil or Ole Henriksen Truth Serum Collagen Booster and Pure Truth Youth Activating Oil -- and I find it enhances my face's absorption power when interacting with the applied serum(s).
Initially, this product's ~$70 price range may jade you, but from the wonders it has performed with brightening, smoothing and nurturing my face... I would pay the world for it.