<<Disclaimer:  Verify this information before applying it to your situation.>>
 
Cellulose is a carbohydrate polymer of D-glucose.  It is the structural
material of plants, such as wood in trees.  It contains no gluten protein.
Methyl cellulose is a chemically modified form of cellulose that makes a
good substitute for gluten in rice-based breads and so forth.  I think that
methyl cellulose can be purchased from Ener-G foods in Seattle.
 
Don Kasarda,
Albany, CA
 
>     Sorry if this question has come up before...does anyone know what
>     cellulose is?  Just noticed it on another posting saying it was
>     "safe."  Thank you.