negatively regulates negative regulation of phosphorus metabolic process regulation of inositol phosphate biosynthetic process negative regulation of inositol phosphate biosynthetic process negative regulation of inositol phosphate biosynthesis Any process that decreases the rate, frequency or extent of inositol phosphate biosynthesis. Inositol phosphate biosynthetic processes are the chemical reactions and pathways resulting in the formation of an inositol phosphate, 1,2,3,4,5,6-cyclohexanehexol, with one or more phosphate groups attached. biological_process GO:0010920 inositol phosphate biosynthetic process negative regulation of carbohydrate metabolic process biological regulation negative regulation of alcohol biosynthetic process