Humectant: A substance that attracts moisture.

Hyaluronic Acid: An acid that occurs naturally in the skin, helps retain the skin's natural moisture.

Hydrate: To add moisture to the skin

Hydroquinone: A bleaching agent used in skin preparations.

Hyperpigmentation: Darkening of the skin, commonly produced by ultraviolet radiation, which provokes melanocytes in the skin.

Hypodermis: Below the surface of the skin.