Foreword

v

PART I

THE SKIN

1

Introduction

3

Chapter 1

Skin Physiology

7

The Skin’s Functions

7

The Skin’s Components and Structure

9

The Skin’s Layers

11

The Epidermis

13

The Dermis

18

The Hypodermis

20

Chapter 2

Product Penetration

23

What is Product Penetration?

24

Why Products Penetrate

26

How Products Penetrate

27

Factors Affecting Product Penetration

27

Product Testing

29

Chapter 3

Skin Types and Skin Conditions

31

Skin Types

31

Normal Skin

32

Oily Skin

33

Dry Skin

34

Combination Skin

35

Skin Conditions

35

Dehydration

35

Couperose

37

Sensitivity

37

Pigmentation

39

Aging

40

Acne Vulgaris

42

Rosacea

43

Final Comment

44

Chapter 4

Definition of Terms

45

PART II

PRODUCT INGREDIENTS

73

Introduction

75

Cosmetic Ingredient Labeling Regulations

77

PART III

APPENDIX: BOTANICAL LATIN NAMES

317

Botanical Latin Names

319