Chapter 21, Problem 21.115EP

Interpretation Introduction

Interpretation: The difference in the structure of vitamin ${\text{D}}_{\text{2}}$ and vitamin ${\text{D}}_3$ has to be stated.

Concept introduction: The most important forms of Vitamin D are Vitamin ${\text{D}}_{\text{2}}$ and Vitamin ${\text{D}}_{\text{3}}$.  Vitamin ${\text{D}}_{\text{2}}$ is found in the foods of plant origin.  Vitamin ${\text{D}}_{\text{3}}$ is produced in the skin of humans and animals.