If absorption were only 10% in the gut, then it could increase it by 10 fold, but it's not that low. Maybe 60 or 70%. Drinking GF juice, helps to deactivate an enzyme that breaks the chem down before it can be absorbed. Effectiveness/absorption can be no greater than 100%. It cannot amplify the dosage. The only danger is when you take other drugs with GF juice, like pain killers, heart meds, etc. Not all meds are efected.