<<Disclaimer: Verify this information before applying it to your situation.>> Hello All, The Day before yesterday I was scheduled to get ready for my Colon Sigmoscopy and prepared all day with just eating broth (homemade so no gluten) and water. I was doing fine until I drank the solution. It is Humco Magnesium Citrate Oral Solution Lemon Flavor. Within 30 Minutes I was vomiting and my head started hurting. I was not able to go to the Dr. Yesterday because, my head felt like it was going to explode and I have a rash all over ( I have DH ). I spoke to the Dr. And Pharmacist who assured me this was gluten free. I could not find a number for the manufacture. Has anyone had any reaction to this product or know how to reach the manufacturer? I have to retake the test but will not take this tonic again, Is there an alternate drink or laxative that will do the same thing? I would appreciate any advice you can give me. Thank You, Lucy