I've been using these products for three months - 2 or 3 different ones. They're a bit hard to find. My Walgrens seems to carry a stock of them. I don't need the $15 a month extra expense, but as my electrolygist said, us women are high maintainance. I think they seem to work, though like every other development I look for, not nearly as fast or as well as I would hope. My nails definitely break less. I've actually got 2 or 3 that extend beyond the finger end. I don't know about hair changes, though I think I am getting less in the brush. I'm going by the old saying, every little bit helps.
Susan Kay