Orthoplex White S.F.M. XcellS. F. M. Xcell now features Inositol, which is integral to healthy thyroid function. Inositol acts as a second messenger in TSH receptor signal transduction, one of the first steps required for healthy thyroid hormone production. Features Inositol an essential precursor for healthy thyroid function Nutrients required for production and conversion of T4 to T3 Full spectrum of activated B vitamins including hydroxocobalamin B12 Withania KSM 66