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I just discovered in my neighborhood LONGS Drugstore the Nature Made line
of vitamins, which specifies--based on the 5 or 6 different products I
glanced at--whether or not the product is gluten free.  The bottle in front
of me is labeled Niacin 100 mg, and also states "No artificial colors, no
articial flavors, no preservatives; no chemical solvents, yeast, starch or
gluten."  The company address is Nature Made Nutritional Products, Mission
Hills, California, 91346-9606.  Phone 1-800-276-2878 M-F 7 am-4 pm PT in
U.S. This is all I know.
 
HERB BOLZ  :)               *   Davis, California, USA
(personal views only)       *   (between Sacramento and San Francisco)
[log in to unmask]  *     ---city of bikes---