xylose isomerase

the enzyme xylose isomerase

Xylose Isomerase is an enzyme that can be used to convert fructose into glucose. Normally, fructose is “passed” from the small intestine through the intestinal wall into the bloodstream and then broken down in the liver. In people with fructose intolerance this “passing” is not possible due to a problem with the gate GLUT-5 in the intestinal wall.

As a result, the fructose passes with the rest of the food into the large intestine. Because the large intestine has no way of digesting fructose, it undergoes what is known as anaerobic digestion, in which the fructose is fermented. This process releases a lot of gas and acid. These are the causes of the well-known problems in fructose intolerance.

Using Xylose isomerase, fructose will be converted to glucose already in the small intestine and glucose will be digested and resorbed.

our products

fructase – 36 capsules

fructose intolerance

Capsules with the enzyme Xylose Isomerase


quatrase forte – 36 capsules


Capsules containing four different enzymes to aid the digestion of various FODMAPs such as lactose. Ideal for the consumption of large amounts of FODMAPs.


starchway – 50 capsules

starch and sucrose intolerance

Capsules containing the enzymes Invertase and Gluco-Amylase.


fibractase forte – 36 capsules

fructan and galactan intolerance

Capsules containing the enzyme Alpha Galactosidase.


lactase 20,000 – 50 scored tablets

lactose intolerance

This product is the highest lactase dosage tablet we supply. It is ideal if you are very sensitive to lactose or when consuming large amounts of lactose from food.


free advice from our dietitians

Do you have questions about our products? Feel free to contact us. One of our dietitians will help you find the supplement that fits your needs best.

intoleran employees
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