<<Disclaimer: Verify this information before applying it to your situation.>> Hello all! I apologize for the delay in summarizing-I have been very ill and got slammed with responses!! Thanks so much to all who responded-I got the most of any post!! The question was what vitamin deficiency causes cracks in the sides of your mouth. The majority of people stated B-vitamins, but the second choice was Vit. C. Some other people had some other suggestions, those are listed below. My cd daughter had awful looking lips, with cracks and big red places around her lips, which eventually cracked. This can be caused by a zinc definiency, according to her gasto. He did a blood test, and sure enough, that's what is was. She went on a high dose of zinc and it eventually cleared up. My experience with cracks in the corners of the mouth was a result of systemic candida yeast. The Merck Manual home edition ($10 at Borders Books) has symptoms indexed and also a section on vitamin deficiencies Cracks at the corners of your lips can be caused by a vitamin deficiency (sorry I don't remember which vitamin), but they can also be angular chelitis, which is an autoimmune problem, and is a known symptom of celiac. I get that with accidental gluten. Angular cheilitis is most often caused by an infection—usually fungal, but it also can be viral or bacterial in origin. Check out this website. http://www.faqs.org/nutrition/Smi-Z/Vitamins-Water-Soluble.html Actually that chart shows the corner cracks under a RIBOFLAVIN deficiency. My favorite book for this info is Earl Mindell's 'Vitamin Bible', printed by Warner Books. Under Mouth sores and cracks which lists this as symptom it mentions needing B12, B6. You can get these from the foods: milk, liver, kidney, yeast, cheese, fish, eggs for B12. For B6 Dried nutritional yeast, liver, organ meats, legumes, whole-grain cereals, fish. Recommended Supplements: 50 Mg B-Complex 3 times daily with meals. I have taken vitamin B complex for years and haven't had the cracked corners for some time. There's a cheaper brand and it's gluten free. It can be gotten at WalMart. Nature Made Super B-Complex - they have had a special on it lately, where we get 50% more free. www.NatureMade.com, it's out of Mission Hills, California. I think it's under $8.00 with tax for 150 tablets on the special sale. There is a great book called, "Prescriptions for Nutritional Healing" by Phyllis and James Balsch. They usually have copies of it for sale at Walden Books or Barnes and Nobles, and of course, Amazon. Make sure you get the most recent edition if you buy it. It has the lists you are looking for plus a whole lot more. I practically healed myself of all my health woes using this book alone. I cannot recommend it highly enough. Thanks again to all of you!! Lisa Hughes * Please remember some posters may be WHEAT-FREE, but not GLUTEN-FREE * Archives are at: Http://Listserv.icors.org/SCRIPTS/WA-ICORS.EXE?LIST=CELIAC