This product is VERY greasy.If you have super dry fried hair, it may work for you, otherwise you'll look very greasy within an hour after use.
Overall, I give this product 4.5 lippies. The pros are that this serum is oil free and alcohol free; smells great (kind of like watermelon); neat packaging (the nozzle closes, thus prevents leaking and spilling); a little goes along way; does not leave residue;makes hair soft and shiny;affordable; works better than most serums (both high and low end). The cons for me are that this serum is a tad too oily for my hair; while my hair is left shiny and smooth, I don't like the oily feel...That said, I prefer Ion's oil free glosser, since it is less oily. I will not r/p BTZ serum--it is a good product, just not for my hair.