Hair, skin, nails - all vastly improved. It's been over 4 years for me, but my skin started looking much better within a few weeks, nails took longer but are strong and lustrous now, hair is shiny and feels thicker. I look younger than I did 10 years ago (I'm 55). I weigh about 5 pounds less than I did when I quit - I wasn't heavy before, but did have a beer gut, which is gone. My body just looks and feels healthier all around.