It works on pale skin with very dark terminal hair. It's a permanent reduction, not a permanent removal. The technology is always evolving so I'm sure they will eventually have something that is much more efficient and effective. It would probably work well on a pale white guy with dark thick leg hairs. While doing research on it myself, I came across some who had it done and said it's extremely effective and permanent but also some others who claimed it didn't work at all. I would say if you get a decent price and do some research on a good clinic it might be worth a shot. But don't expect to be smooth and hairless because it probably won't deliver that. I never went through with it so I can't give say for myself unfortunately. I did find a pretty informative website for anyone interested. Not sure if I'm violating rules by putting it here so mods feel free to remove. www.hairtell.com