We have special formulas for different geographic areas in the USA and the associated ALLERGY FORMULA for getting 40+ sources of flower, tree, and grass pollen!! Once you determine in what ZONE you live, you can then purchase the associated formula! Zone 1 is the Northeast, Zone 2 is the Southeast, Zone 3 is the North Midwest, Zone 4 is North & South Dakota & Nebraska, Zone 5 is Texas, Oklahoma, & Kansas, Zone 6 is Arizona, New Mexico, Colorado, & Utah, Zone 7 is Montana, Wyoming, & Idaho, Zone 8 is Oregon and Washington, Zone 9 is California & Nevada. PLUS we have separate zones for Hawaii, Alaska, and Texas!