I do have very fine hair. But I also do a lot of bleaching and a lot of heat styling, so shine is something that I often need to add back into my hair. I wanted Redken Glass to be more like Biosilk, something I could put a little in and watch my hair shine. This was not the case for me. It did give shine, but made my hair look greasy. On top of that, it was so heavy! It weighed down my style so much! I don't want to count this product out for everyone. I would just steer clear of it if your hair is fine. I have used it on the ends of my extensions before. The extension hair soaked it up, giving a bit of softness with a mass amount of glamorous shine. So I would recommend it for those with extensions in, especially blondes. For those lucky enough to have naturally thick hair, I think this would be great. It's just the weight of it that my natural hair had issues with. It is a nice serum for some, just not for everyone.