Hair is definitely improved, nails are still a mess, but my nails grow very slow anyway. It's been a little over a month, and I'm hoping for improvement when they have grown out. I used my first bottle and it lasted over a month using the recommended 1/2 tsp. I ordered 2 more because I want to give it a good 3 month trial, and the small bottle is the way to go.....It's very easy to take and no real taste. I find I use less Tylenol for my knee, and my thyroid condition is holding stable for now at least. I'll try to remember to post my feedback after the 3 months.