One shade at best... no one notices.
As a guy with short hair I did not expect to see a huge difference, but I have to say, I am a bit disappointed. I used this in addition to the one time shower treatment, and then have been using both of these for the last few weeks. I would say my hair naturally lightens in the sun and these gave me about one shade and not much else. I think in the future I will avoid possible hair damage and just let the sun do its thing.
Rating: 3 stars