Yes it lightens, but your overall outcome may vary
Bought the volume 40 bottle to use on my beard, which naturally has a mix of white and dark brown hair.  I wanted this product to whiten the dark brown hair to match the other already white hair.  Easy enough to mix & apply a thick coating to the beard.  I left it on a bit longer than the recommended time.  The hair became a mix of white and a patchy, gross yellow color.  Oddly enough, there was more yellow areas than I had dark brown hair, so I'm not sure what the lightener was doing to the already white hair.<br /><br />Does it lighten, yes.<br />Does it lighten consistently across the hair? No.<br />Will it lighten to white?  Doesn't seem so.<br />Would I buy this again?  Probably not.
Rating: 3 stars