Alpha hydroxy acid (AHA) There are five types of AHAs: glycolic, lactic, citric, malic and tartaric. They're all forms of chemical exfoliants that "unglue" dead cells from the skin's outer layer. The aim of this is to allow healthier cells to come to the surface, while at the same time improving skin texture and unclogging pores.
Find it in: SK-II Facial Treatment Clear Lotion; Alpha-H Liquid Harmony.
Beta hydrox acid (BHA) There is only one Beta hydroxy acid, and that's salicylic acid. It also works to "unglue" dead cells, but its difference is that it's oil-soluble (while AHAs are water-soluble), making it better for blemished skin, while AHAs are better for dry or sun-damaged skin.
Find it in: Natasha Cook Dermatologist Concentrated Clarifier.
Antioxidants Antioxidants are molecules that "mop up" and protect the skin by absorbing radiation from the sun (free radicals). Vitamins A, C, E, green tea and thiotic acid are antioxidants.
Find it in: Dermalogica MultiVitamin Power Concentrate; Elizabeth Arden MultiVitamin Power Concentrate.
Hyaluronic acid This is a naturally occurring water-binding agent that traps moisture into the skin. It's especially good for super-dry skin as it has the capacity to bind 10,000 times its own weight in water.
Find it in: MD Formulations Advanced Hydrating Complex Cream, UltraCeuticals Ultra ACE Hydration Booster.
Peptides Molecules made up of amino acids (proteins) that act as messengers in the skin allowing the dermis and epidermis to communicate more effectively.
Find it in: SK-II Signs Up-Lifter,
