Browse our dictionary for all the hair ingredients and terms on your favorite products, with trusted insights from trichologists

Water
Water is often deionized, distilled or purified and used as a delivery system to transport other components into the skin. This is the first ingredient you will read on the back of your skincare labels and is also one of the most important terms in the hair care

Dry Shampoo
A dry shampoo is a shampoo in powder form used without the addition of water.

Follicle
The sheath of cells and connective tissue which surrounds the root of hair

Hair Root
Strands of hair originate in an epidermal penetration of the dermis called the hair follicle. The hair shaft is the part of the hair not anchored to the follicle, and much of this is exposed at the skin's surface.

Split Ends
A split end is tip of a person's hair which has split from dryness or ill-treatment

Scalp
The scalp is the skin covering the head where the hair grows.

 Ingrown Hair
Ingrown hair is a condition in which the that has been removed begins to grow back into the skin and curves into the skin causing a bump.