greetings, All! May IO suggest a wonderful natural product - a liquid silica - called ORGONO SILIPLANT - my nails are super strong, and my hair (I'm 80) is long and thick - I do color it!!! Having a hard time giving that up, for sure. You can take as many servings as you like, but it's an incredible product, and I have a number of friends who also swear by it. I take one - two servings a day. It comes with a plastic measuring cap.