Skin Acids Explained

The four popular skin acids are:

Alpha Hydroxy Acid (AHA,) Beta Hydroxy Acid (BHA,) Poly Hydroxy Acid (PHA,) and Hyaluronic Acid (HA?.)

Each one of these acids serves a different purpose. 

1. Alpha Hydroxy Acid (AHA)

Used to help exfoliate the skin, with the most common being Glycolic Acid.

Glycolic Acid: A type of AHA. Smaller sized acid which better penetrates the top layers of the skin.  Can be naturally derived from Sugarcane, but the synthetic version is more commonly used (source). Naturally has moisturizing properties. Used in both moisturizers and cleansers. 

2. Beta Hydroxy Acid (BHA)

BHAs claim to offer deeper penetration than AHAs. Look for products that contain a sunscreen, because this acid increases your sensitivity to the sun. (source).

Salicylic Acid: Most common BHA, but fun fact, it technically isn't one.

3. Poly Hydroxy Acid (PHA)

Similar to AHA but gentler than its counterpart. They don't increase your sensitivity to the sun, which is an added bonus over AHAs. (Source) It may be incorporated into either a moisturizer or ca cleanser

4. Hyaluronic Acid 

Often used in serums, for its hydrating properties. Works to retain moisture in the skin by attracting water molecules. Must layer a moisturizer over it, otherwise, your skin could become drier afterward when the water evaporates from your skin. (source)

 See also:

Dr. Dray Youtube Channel, US Food & Drug Administration, Paula's Choice

What's part of your skincare routine?