A Microcrystalline Cellulose is non-digestible plant matter in sources like wood pulp and tough plant stalks. These plants are harvested, cleaned and ground to create a fine, white powder. It is called microcrystalline because its tiny crystals can only be viewed under a microscope. It is a term for refined wood pulp and is used as a texturizer, an anti-caking agent, a fat substitute, an emulsifier, an extender, and a bulking agent in food. The Microcrystalline Cellulose is very effective and useful.