Hyaluronic Acid: Comedogenic Rating & Safety Profile
Also known as: HA · Sodium Hyaluronate
A powerhouse humectant that draws moisture from the air into the skin, holding up to 1,000 times its weight in water.
Quick facts about Hyaluronic Acid
Safe
0 = won't clog pores · 5 = highly pore-clogging
Safe
0 = inert · 5 = often irritating
Humectants
Generally considered safe
Typically yes
HA, Sodium Hyaluronate
Quick verdict
Hyaluronic Acid is a humectant with a safe comedogenic profile (0/5) and safe irritancy (0/5). A powerhouse humectant that draws moisture from the air into the skin, holding up to 1,000 times its weight in water.
What is Hyaluronic Acid?
Hyaluronic acid (HA) is a glycosaminoglycan — a long-chain sugar molecule — that occurs naturally throughout the human body, including in skin, joints and eyes. In cosmetics it is produced by bacterial fermentation, making it both vegan and identical to endogenous HA. Its defining trait is hygroscopy: a single HA molecule can bind up to 1,000 times its weight in water. That makes it the most powerful humectant in mainstream skincare and a go-to ingredient for restoring plumpness to dehydrated skin. Different molecular weights penetrate to different depths — high-MW HA sits on the surface and forms a hydrating film, while low-MW HA reaches deeper layers of the epidermis.
Comedogenic Rating: What 0/5 Means for Your Skin
HA is rated 0/5 comedogenic. It is a water-binding sugar molecule with no oils, waxes or fatty acids that could physically block a follicle. Every skin type — including the oiliest, most acne-prone skin — can use it daily without any pore-clogging risk. In dry climates, however, low-MW HA can occasionally pull moisture out of deeper skin layers if not sealed with an occlusive moisturiser, leaving skin feeling tighter rather than plumper.
Benefits for skin
- Plumps fine lines and surface dehydration within minutes
- Compatible with virtually every active ingredient
- Non-comedogenic and safe for the entire face including the eye area
- Helps reinforce the moisture barrier when layered under occlusives
Potential side effects & who should avoid it
HA is one of the safest ingredients in skincare. True allergic reactions are vanishingly rare. The most common 'side effect' is feeling tight or dehydrated in arid environments — this happens when HA pulls moisture from the air, but if there is no humidity to draw from, it pulls from your skin instead. The fix is simple: apply HA to damp skin and immediately seal with a moisturiser containing occlusives like dimethicone, squalane or petrolatum.
Best for
- Dry
- Oily
- Combination
- Sensitive
- Acne-prone
- Mature
Avoid if
No widely reported groups need to avoid this ingredient. Patch-test if you have a history of sensitivities.
How to use Hyaluronic Acid safely
Apply HA serum to slightly damp skin morning and night, then immediately layer a moisturiser on top to lock the hydration in. Pairs safely with every other active ingredient. Multi-molecular-weight HA serums are ideal because they hydrate at multiple skin depths simultaneously.
Related forms: Sodium hyaluronate is the salt form, smaller and faster-penetrating; both behave the same for daily use.
Commonly found in
Hyaluronic acid is in serums, moisturisers, sheet masks, eye creams, lip products, sunscreens and most modern cleansers. It is also widely used in injectable dermal fillers, but the topical and injectable forms behave very differently.
Found Hyaluronic Acid in your skincare?
Paste the full ingredient list into our INCI Analyser to see how this ingredient interacts with everything else in the formula.
Frequently asked questions
Other humectants to know
Panthenol
Converts to Vitamin B5 in the skin. A humectant, soothing agent and barrier-repair active in one molecule.
Allantoin
A gentle keratolytic and soothing agent that calms irritation and softens roughness without exfoliating aggressively.
Sodium Hyaluronate
The salt form of hyaluronic acid. Smaller, more stable and faster to penetrate the upper layers of the skin.
Glycerin
The most studied humectant in skincare. Draws water into the skin, supports barrier function and is suitable for every skin type.
Want the full picture on pore-clogging ingredients? Read our complete guide to comedogenic ingredients for the dermatology research behind the 0–5 scale and the full list of high-risk ingredients to avoid.
Written by ScanSkinAI Team · Last updated May 2026
This information is for educational purposes only. Always patch-test new products and consult a dermatologist if you have specific skin concerns.