<prompt> VITAMIN WHICH IS NOT SYNTHESIZED BY THE BACTERIAL FLORA IN THE INESTINE IS?vitamin kBiotinNiacinPantothenic acid  <response>: Endogenously synthesized Vitamins are 1. Synthesized by the body- Niacin: synthesized from an amino acid Tryptophan Vitamin D: synthesized from 7 Dehydrocholesterol by exposure to UVB rays290-315nmin the skin. 2. Synthesized in the bodyby Bacterial flora in the intestine Vitamin K Biotin Pantothenic Acid Reference: Harpers illustrated biochemistry 30th edition 