Chapter 5.5, Problem 28AYP

Summary Introduction

To write:

The name of the locations where cholecalciferol is produced and then modified into vitamin D and its function.

Introduction:

The diet must be supplemented with vitamin D in fortified milk or vitamin pills. Egg yolks and dairy products are the natural sources of vitamin D. The synthesis of vitamin D starts in skin when it exposed to ultraviolet light. If enough ultraviolet light is available, people can generate all the vitamin D they need through this process.