Chapter 21, Problem 21.118EP

Interpretation Introduction

Interpretation: The reason as to why Vitamin D is called as “sun shine” Vitamin 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.