Source Naturals Benfotiamine is a fat soluble, bioavailable form of the vitamin B-1 (thiamine). Benfotiamine provides support for healthy glucose metabolism for those already within the normal ranges, and it also protects the kidneys at a cellular level. Contains no yeast, wheat, gluten, dairy, corn, soy, egg, salt, sugar, starch, preservatives, or artificial color, flavor or fragrance.