Chapter 21, Problem 21.109EP

Interpretation Introduction

Interpretation: The structural differences among the three retinoid forms of vitamin A have to be described.

Concept introduction: There are four types of fat-soluble vitamins: Vitamin A, Vitamin D, Vitamin E and Vitamin K.  Preformed and precursor forms of Vitamin A are obtained from normal dietary intake.  Preformed Vitamin A forms are called retinoids.