Which vitamin is synthesized by intestinal sites?: (A) Vit B, (B) Vit A, (C) Vit D, (D) Vit K
Answer is D. Three compounds have the biological activity of vitamin K phylloquinone, the normal dietary source, found in green vegetables; menaquinones, synthesized by intestinal bacteria, menadione and menadiol diacetate, synthetic compounds that can be metabolized to phylloquinone menaquinone is synthesized in the intestinal site by the intestinal bacteria Ref: Harper 30e, page: 554