Cellulose Gum (also called Carboxymethylcellulose) is a thickening agent made from plant fibers.  Cellulose Gum is considered to be hypoallergenic and non-toxic.  Often used in every day items such as food and drinks to give distinct texture.  Lubricant manufacturers have been safely using Cellulose Gum for years as a way to thicken up an otherwise thin liquid.  Can turn liquid lube to a gel lubricant.