roller ball may not be the best mode of application [SEP] i have been using this serum for days am and pm i believe i see some minor reduction in the lines under my eyesbut it could be wishful thinking i am not convinced there is always serum coming out while rolling it on because the nature of steel is that it feels cool to the touch therefore can give the impression of depositing serum when in fact it is not to determine this i ran it over white tissue several times only about of the time did serum actually come out i removed and cleaned the steel roller ball as directed then reran my experiment and had the same resultsduring application i can briefly detect a damp look where it is being deposited but this goes away within seconds at other times nothing is on the surface of my face and immediate dabbing with a tissue proves there is no serum i am not convinced this is the best mode of applicationif after a couple of months of use i see definite wrinkle reduction i will happily update my review accordingly