Hyaluronic acid (HA) is a powerful moisturizing ingredient known to hold up to 1,000x its weight in water. It also exists naturally in skin, joints, and eyes. Yet some people who diligently apply HA find that it "actually makes them drier." There's a reason.
How hyaluronic acid can cause dryness
HA is a humectant that pulls in moisture. After application it absorbs water, and the source of that water matters.
In humid environments: it draws airborne moisture to the skin surface for a moisturizing effect
In dry environments (indoor heating/AC, winter): with little airborne moisture, HA pulls water up from the dermis → the surface is hydrated but deeper moisture escapes, making skin drier over the long run
How to use hyaluronic acid effectively
Principle 1: Apply to damp skin
Apply HA serum while skin is still slightly damp after cleansing (not fully dried). It absorbs more effectively using the residual surface moisture.
Principle 2: Seal with an occlusive
Always layer a cream or oil-based moisturizer over HA to "lock in" the moisture so it doesn't evaporate. Applying HA alone and stopping there backfires in dry environments.
Principle 3: Check molecular weight
- High-MW HA: forms a surface film, immediate moisturizing feel
- Low-MW HA: can penetrate the epidermis, deeper hydration
- Hydrolyzed HA: possible dermal penetration, supports elasticity
A product combining all three is most effective for layered hydration.
Forms of hyaluronic acid
Hyaluronic Acid / Sodium Hyaluronate
Sodium hyaluronate, the salt form of HA, is more stable in aqueous solution and absorbs well. It's the most common form you'll see on ingredient lists.
HA Crosspolymer
A form with a reinforced molecular structure that stays on the skin longer.
What to check when choosing an HA serum
- Whether Sodium Hyaluronate or Hyaluronic Acid is near the top of the ingredient list
- Two or more HA molecular weights are more effective
- No unnecessary fragrance or alcohol
- Supporting ingredients (panthenol, glycerin, allantoin) add moisturizing synergy
Hyaluronic acid vs glycerin
HA and glycerin are both humectants, but some research finds glycerin offers better value. That said, at high concentrations (over 50%), glycerin can actually pull moisture from skin, so products blend it at appropriate levels. Using both together lets them complement each other.
Used correctly, HA delivers excellent moisturizing for all skin types. The key is "sealing the moisture with an occlusive after application."