My fructose malabsorption was diagnosed by KDM as being medium-severe. I could not eat any fruit at all, and had to ration most vegetables too, to avoid lots of pain, extreme bloating and gas. I've been taking these supps for the last 5 months: Jarrow N Acetyl Glucosamine 750mg (blurb says N-A-G combines with mucin secreted from goblet cells to form the glycocalyx, a protective layer of glycoproteins and polysaccharides that lines the digestive tract.) Jarrow Glucosamine HCI Mega 1000mg (Glucosamine is an aminosaccharide synthesized from glucose and the amino acid L-glutamine. HCl (hydrochloric acid) stabilizes the glucosamine in this product. Glucosamine is a component of joint and intestinal tissue. Glucosamine is converted to N-acetyl-glucosamine in the intestines by the goblet cells.) (one a day of each) I believe they work by healing the cells lining the intestine that produce GLUT-5. I decided to try them as I was getting desperate to help my poor innards with anything I could. After 3 weeks I tested some fruit (actually I got a cold and the fruit cravings overcame me) and now I can get away with eating 2 apples in one go, or drinking a whole glass of fresh squeezed orange juice. I even ate a slice of toast a honey. After the first packs ran out I went back to having full scale fructose problems within 3 weeks, so this is not a one-off cure, I need it as an ongoing thing. But it is wonderful to be able to eat all those healthy things that I had to avoid.