Some nutrients can be tricky to get enough of on the low-FODMAP diet, especially during the early elimination phase. Many people get all the nutrition they need from following a good, balanced eating plan, but it’s not a bad idea—when giving up such an array of foods, including wheat and milk—to take a balanced B vitamin supplement (a naturopath suggested a blend called “B-50” to me several years ago) and a calcium supplement. Also, most of us in northern climes can benefit from taking D-3. Finally, an age-appropriate multivitamin is a good idea. Be sure to check with your health care provider regarding supplements.