How Hyaluronic Acid Hydrates Skin
How Hyaluronic Acid Hydrates Skin — a naturally occurring humectant in the skin that can bind and hold a large volume of water relative to its weight, helping keep the surface plump and supple. Applied topically, it draws moisture into the upper layers of skin, with different molecular weights sitting at different depths of the stratum corneum. Because it pulls water from the environment, its performance depends partly on humidity and on sealing it in with a moisturizer.
Key points
- Hyaluronic acid is a glycosaminoglycan that attracts and retains water in the skin.
- Lower-molecular-weight forms penetrate more superficially deeper than large molecules, which stay nearer the surface.
- It temporarily plumps the skin's surface, softening the look of fine lines from dehydration.
- In dry air it can draw water from deeper skin, so applying to damp skin and sealing with cream improves results.
Frequently asked
Should I apply hyaluronic acid to wet or dry skin?
Applying it to slightly damp skin and following with a moisturizer helps it draw in and lock down water, especially in dry environments.
Does hyaluronic acid work in low humidity?
In very dry air it can pull moisture from deeper skin layers, so pairing it with an occlusive moisturizer helps prevent added dryness.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
