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What Is Cellulose in Vitamins?

By Kirstin Hendrickson

If you've read over the ingredients on a bottle of vitamins, you may have noticed the ingredient "cellulose" and wondered what its purpose was. Cellulose isn't a vitamin -- it isn't even a nutrient, in fact -- but it does help make vitamin pills easier to bottle and swallow.

Cellulose

Cellulose in vitamins is simply fiber; it's the same molecule that you find in fiber-containing fruits, vegetables and whole grains. You can't digest fiber because you don't produce the necessary enzyme, which is called cellulase, explain Drs. Reginald Garrett and Charles Grisham in their book "Biochemistry." Chemically, fiber is very similar to starch -- it's made up of long chains of glucose molecules. Because you can't digest fiber, however, the glucose is inaccessible to you and fiber contains no calories.

Vitamin Pills

When you take vitamins, you're taking only a very small quantity of each vitamin and mineral -- where calcium is a notable exception. As a result, to make small quantities of vitamins into a pill that's large enough for you to take easily, manufacturers add cellulose. The fiber binds all the vitamins and minerals together, and also ensures that they're in solid form as opposed to liquid or powder.

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Benefits

While there are many benefits of fiber to human digestion -- it helps regulate your digestive tract, binds cholesterol and toxins and helps keep your blood sugar stable -- the fiber or cellulose in vitamins doesn't do much for you. This is because you need relatively large quantities of fiber each day; women need 25 grams per day, and men need 38 grams. Compared to the required quantities, vitamin pills provide a minimal amount -- less than a gram.

Considerations

For those vitamins that would otherwise be in liquid form, one benefit of a pill made with large quantities of inactive ingredients like cellulose is that it helps to prevent the vitamins from reacting before you consume them. Some vitamins, like C and E, are highly reactive. They can interact with air, and this reaction makes them inactive in the body. Pills help keep vitamins from reacting with air, making them more effective when you take them.

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