We use Pectaclear and Ecodetox for about 3-6 months at a therapeutic dose, then ongoing on a maintenance dose. It depends on your child’s age and weight mostly. A younger child may only need 3 months and an older, more like 6 at therapeutic dosages. A younger child will also need a lower dosage (see guidelines in the pdf for Pectaclear in module 4). Since shipping is your issue, you could get 3 months worth, or whatever works best for you financially now. Even if you don’t go through all of it in 3 months, you can still use it when you reach the maintenance stage.