What does hyaluronic acid do for your skin?
What does hyaluronic acid do for your skin? Its benefits, how to apply it on damp skin, sodium hyaluronate vs hyaluronic acid, molecular weights and myths.
By the Green Point editorial teamUpdated 5 min readKey takeaways
- Hyaluronic acid is a humectant: it binds water and holds it in the top layers of your skin, so skin looks plumper and feels less tight.
- It isn't an exfoliating acid and suits every skin type, including oily and sensitive skin.
- Apply it to damp skin and seal it with a moisturizer, or the hydration fades quickly.
- Sodium hyaluronate is simply the salt form; molecular size matters more than the name.
On this page
Hyaluronic acid hydrates your skin. It is a humectant, a molecule that binds water, and your skin already makes it to stay moist. In skincare, it draws water into the outer layer of skin, making it look smoother and plumper and feel less tight. It works best on damp skin with a moisturizer on top.
Hyaluronic acid benefits
Hyaluronic acid (often shortened to HA) is a sugar-based molecule found throughout your body, with most of the skin's supply in the deeper dermis. It has an unusual capacity to bind and hold water. Your skin makes less of it with age, and sun damage speeds up the loss.
- Hydration: it raises the water content of the outer skin layer, so dry or dehydrated skin feels more comfortable.
- Smoother look: better hydrated skin reflects light more evenly and fine dryness lines look softer, for as long as it stays hydrated.
- Lightweight feel: it gives moisture without oil, which suits oily and acne-prone skin.
- Gentle: it rarely irritates, so it fits easily alongside actives like retinol or exfoliating acids.
Dermatologists list hyaluronic acid among the moisturizer ingredients that help relieve dry skin, alongside glycerin, shea butter and others. Our guide to dry skin on your face explains how to combine them.
How to use hyaluronic acid: apply on damp skin
- Cleanse your face and pat it lightly with a towel, leaving it slightly damp.
- Apply a few drops of hyaluronic acid serum (or a hydrating toner or essence) and press it in.
- Apply any treatment serum you use.
- Within a minute or two, seal everything with a moisturizer.
- In the morning, finish with sunscreen.
The damp skin gives the humectant water to hold right away, and the moisturizer on top slows that water from evaporating. Dermatologists give the same advice for all moisturizers: apply them while your skin is still damp after washing. You can use HA morning and night. See where it fits with other products in our skincare routine order guide.
Sodium hyaluronate vs hyaluronic acid
Sodium hyaluronate is the sodium salt of hyaluronic acid. It dissolves easily in water and is stable, so it is the form most serums actually use. Once in a water-based product, the two behave in much the same way. A label that says "hyaluronic acid serum" but lists sodium hyaluronate is not hiding anything.
Molecular weights explained
| Type | Often listed as | What it does |
|---|---|---|
| High molecular weight | Hyaluronic acid, sodium hyaluronate | Stays on the surface and forms a film that holds water and smooths |
| Low molecular weight | Hydrolyzed hyaluronic acid, hydrolyzed sodium hyaluronate | Smaller pieces that reach a little deeper into the outer skin layers |
| Modified forms | Sodium acetylated hyaluronate, crosspolymers | Designed to hold on to skin or water for longer |
Many serums combine several sizes for surface and deeper hydration. In the body, very small hyaluronic acid fragments can act as inflammation signals, but whether that matters for skincare is not clear. If you find a "multi-weight" serum irritating, try one with high molecular weight HA only.
Who should use hyaluronic acid?
Almost everyone. It suits dry, oily, combination, sensitive and acne-prone skin, and it is especially useful if your skin feels tight after cleansing, if you live in a cold or air-conditioned climate, or if drying treatments such as retinoids or acne products leave your skin parched.
It is also a helpful part of a recovery routine when your skin barrier is irritated, together with a moisturizer that contains lipids. Read more in our guide to repairing your skin barrier.
Hyaluronic acid myths
- "It's an acid, so it exfoliates." No. Despite the name, it doesn't peel or exfoliate the way glycolic or salicylic acid does.
- "It works like fillers." Injectable fillers use a thick, cross-linked gel placed under the skin. A serum only hydrates the surface, so any plumping is temporary.
- "It pulls water out of your skin in dry air." The theory is that with little moisture in the air, a humectant draws water from deeper skin instead. How much this happens with normal serums isn't well established, and a moisturizer on top avoids the problem either way.
- "More is better." A few drops are enough. Layering several HA products adds little and can feel sticky.
- "Only dry skin needs it." Oily skin can be dehydrated too, and HA hydrates without adding oil.
Frequently asked questions
Can I use hyaluronic acid every day?
Yes. It is one of the gentlest skincare ingredients and you can use it once or twice a day, morning and night. Apply it to damp skin and follow with moisturizer each time. If a particular serum ever stings, the cause is usually another ingredient in the formula, such as fragrance or a preservative, so check the label.
Can I use hyaluronic acid with retinol or vitamin C?
Yes, it pairs well with both. Apply vitamin C first in the morning, then hyaluronic acid, moisturizer and sunscreen. At night, many people apply HA before or after retinol to reduce dryness. Because it is not an exfoliant and rarely irritates, it combines safely with nearly every other active ingredient.
Does hyaluronic acid help with wrinkles?
Topically, it makes fine lines caused by dryness look softer by hydrating the skin, but the effect lasts only as long as your skin stays hydrated. It doesn't rebuild collagen the way retinoids can. For deeper wrinkles, combine daily sunscreen with proven ingredients like retinol, and talk to a dermatologist about in-clinic options.
Is hyaluronic acid safe during pregnancy?
Topical hyaluronic acid is generally considered a gentle choice and is not among the ingredients usually flagged in pregnancy, unlike retinoids. It is a molecule your body already makes. If you have questions about your skincare during pregnancy or breastfeeding, especially about products with several actives, ask your doctor or midwife.
Sources
- Dermatologists' top tips for relieving dry skinAmerican Academy of Dermatology
- Hyaluronic acid: A key molecule in skin agingDermato-Endocrinology, via PubMed Central
This guide is for general information and is not medical advice. If you have a skin, allergy or health concern, talk to a doctor, dermatologist or dietitian. Green Point scores and Skin Scan results are informational and are not a diagnosis.
