It says


Tips/Cautions
Can be used on ALL skin types but is especially recommended for combination-to-oily skin.
For Best Results: Use CP Serum with a hydroxy acid serum.
If product is too strong: Dilute with water by taking 1-2 drops of CP Serum in the palm of your hand and adding 2-3 drops water.


what is the best hydroxy acid serum to use with cp serum?

Dear tobiastorgenson:

CP Serum can be used with any of our hydroxy acids.

Most clients find it nice to match their copper peptide serums with a hydroxy acid serum: Exfol Serum (2%) OR LacSal Serum (10%)

Actually we have some great specials offered right now where you can save up to 25% off when purchasing CP Serum together with LacSal or Exfol.

• CP Serum + Exfol Serum Combo
• CP Serum + LacSal Serum Combo

Best Wishes,
-Skin Biology