I've never had a product that claimed to make my hair thicker actually work. Well, I guess some of them did, but only because they felt yucky and you couldn't even run your fingers through your hair if you wanted to because they coated your hair with so much crap. I can't say this doesn't have any residue whatsoever, but it is so minimal that I will absolutely use it again. I am a 'no pooer' (google it) so I was worried that it would leave flakeyness or build up, but it rinsed right out. Sometimes a girl just wants to put product in her hair even if she's not supposed to! As an added bonus, this brand has way less nasties and poisons than most others out there.