It rarely happens that one chooses to use only herb. Nearly invariably, a herb’s full potential is exploited best in combination with other herbs, in herbal formulas. The different herbs of a formula all mutually affect one another: a herb may amplify, balance, or redirect the action of a fellow herb. Carefully determining their mutual ratios is paramount, as increasing or decreasing a herb’s relative dosage will grant it a higher or lesser position within the formula, respectively.