<<Disclaimer: Verify this information before applying it to your situation.>> Vitamin replacement, primarily through pills/supplements is as vital as remaining on a GF diet. Whether the individual's microvilli are nonexistent, stunted, trying to grow back, the normal absorptive power is never restored fully. Therefore, we are unable to extract sufficient nutrients and vitamins from food alone. Deficient in one vitamin? Deficient in all. Several companies make a specific Mega Multivitamin for Celiacs. They are totally gluten free and concentrate on the most important replacements for our condition. Primarily, the B group is derived from wheat germ and whole grains, therefore we get practically none. Folic Acid is always missing and vital to replace. Vitamin C is very important for our healing process and to maintain energy levels. Potassium drops can cause muscle weakness and inability to walk-been there. I take an exellent Mega Multi, extra Folic Acid, Vitamin C-minimum 2000 mg a day and sometimes an extra B-complex. At night I take my Calcium/Magnesium/Zinc about an hour before bedtime, which eliminates leg cramps/fidgets and enables going to sleep with no insomnia. At this for 23 years, trust me, it works. When under extremely fatiguing stress, carry a packet of E-Merg-N-C from health food store. Just pop in a small amount of water and get a great boost of Vit. C, Potassium and other electrolytes. A miracle worker. Best to all, Sandy Rieser Houston, TX