HealthSil comes in one size, our 500g pack.
Take 1-2 tablespoons per day mixed in some kind of liquid or food. There is no unpleasant taste. Since it will not dissolve, stirring several times while drinking will prevent settling. Some have experienced higher energy levels, so it is probably better not to take it right before sleeping. No worry about getting too much–any excess silica not needed by the body is automatically eliminated through the blood stream, kidneys and intestines.