Maybe needs to be applied only at bedtime.
I suspect this is the real magic of all these products.  I have been using glycolic and lactic acid products in some form for 20 years, because I learned back then that skin is naturally a little acidic, and that replacing that acidic mantle daily helps to slough off dead skin cells.  This product is a gel that you spread thinly - it takes a very little amount to cover your face and neck - but it does take some time to dry.  And, alas, the same problem arises as with the collagen serum when you try to apply make-up over the product: it rolls up in little flecks which have to be wiped away.
Rating: 4 stars