Humectants are moisture magnets. Ingredients like Hyaluronic Acid and vegetable glycerin pull moisture from the air into the skin, keeping it plump and hydrated.
Adjust pH: lactic acid (lower), sodium bicarbonate (raise), citric acid. Final pH for skin: 4.5–6.5. a-z of natural cosmetic formulation pdf
A-Z Natural Cosmetic Formulation - School of Natural Skincare Humectants are moisture magnets