I believe 3 teaspoons equals 10 grams. They recommend you use 10 grams a day for the first month, then maintain at a lower dose. I use 1 teaspoon for maintenance, which is 3-3.5 grams.
Just because YOU had a bad experience with it doesn't mean it's bunk. It's worked for me better than Accutane has, and without side effects. People respond differently to it.