I've been on propecia for years. I don't run high doses of winstrol or anything hard on the hairline and my hairline hasn't noticeable changed in the last 8 years. I do have a bit of thinning on top but that was there before I started propecia. I run it year round though, not just on cycle, and haven't noticed any sides from it. I am going to add N2Shampoo to my daily regimen soon too.