COSRX Hydrium Ampoule vs HA 3 Serum
Should I choose COSRX Hydrium Triple Hyaluronic Moisture Ampoule or The Hyaluronic Acid 3 Serum?
Short answer
Choose Hydrium Triple Hyaluronic Moisture Ampoule if you want a short, 15-ingredient hydrating ampoule with three forms of hyaluronic acid, panthenol and gentle PHAs. Choose The Hyaluronic Acid 3 Serum if you want a stated 3% sodium hyaluronate plus natural moisturizing factors, amino acids and ceramide NP. Both are sold as fragrance free, and both list mild acids.
What this means for you
Start with what you notice
Both are COSRX hydrating serums for dry or dehydrated skin. The difference is what comes with the hyaluronic acid.
The ingredient names, translated
Hyaluronic acid holds water in the top layer of skin. The Hydrium ampoule pairs three hyaluronic acid forms with panthenol and two polyhydroxy acids (PHAs), which exfoliate gently. The 3% serum states its sodium hyaluronate strength and adds sodium PCA, amino acids, ceramide NP and cholesterol, plus small amounts of lactic and citric acid. A stated percentage doesn't prove a more hydrating finished product.
How to decide
- Want a short ingredient list with panthenol and PHAs? Hydrium Triple Hyaluronic Moisture Ampoule.
- Want a stated 3% HA with moisturizing factors and ceramide? The Hyaluronic Acid 3 Serum.
- Very sensitive to acids? Patch test either; both list mild acids.
What to expect
Either should make skin feel softer and more comfortable under moisturizer. Neither treats a skin condition. We haven't tested either product.
General guidance, not a test of these products: How hydrating ingredients work; AAD: dermatologists' tips to relieve dry skin. Each product's label source is linked on its product page.
| Product | Price | Size | Key ingredients | Skin type (brand) | Fragrance | Worth knowing | Source |
|---|---|---|---|---|---|---|---|
$20.80 at Stylevana | 40 ml | Hyaluronic Acid | Brand doesn't say | Marketed as fragrance free | No flags recorded; not a safety guarantee | Brand's page Checked | |
$20.00 at Stylevana | 20 ml | Hyaluronic Acid 3% | Brand doesn't say | Marketed as fragrance free | Alcohol | Brand's page Checked |
Short formula vs long formula
COSRX Hydrium Triple Hyaluronic Moisture Ampoule lists 15 ingredients: glycerin and glycols, sodium hyaluronate, hyaluronic acid, hydrolyzed hyaluronic acid, panthenol, gluconolactone and lactobionic acid. COSRX describes a viscous texture with a non-greasy finish.
COSRX The Hyaluronic Acid 3 Serum is a 20 mL serum with 3% sodium hyaluronate. Its 43-ingredient list includes betaine, sodium PCA, sodium lactate, amino acids such as serine and glycine, and ceramide NP with cholesterol.
Skin Realist check: if your skin is happy with one, there’s no prize for owning both.
Label differences worth knowing
The 3% serum also lists alcohol, low on the list. Neither lists fragrance or essential oils. See our COSRX HA essence vs Hydrium ampoule comparison and glass skin layering guide.
Manufacturer sources
Sources and label-check dates are recorded on the product pages.
Which is best for you?
COSRX Hydrium Triple Hyaluronic Moisture Ampoule
Best if you want a short, 15-ingredient ampoule with panthenol.
Also consider it when
- You like the idea of gentle PHAs in a hydrating step
COSRX The Hyaluronic Acid 3 Serum
Best if you want a stated 3% sodium hyaluronate.
Also consider it when
- You want amino acids, sodium PCA and ceramide NP in the formula
Common questions
Which states its hyaluronic acid percentage?
The Hyaluronic Acid 3 Serum states 3% sodium hyaluronate. The Hydrium ampoule doesn't state a percentage.
Do they contain acids?
The Hydrium ampoule lists gluconolactone and lactobionic acid. The 3% serum lists lactic acid and citric acid.
What sizes are they?
COSRX lists the Hydrium ampoule at 40 mL and The Hyaluronic Acid 3 Serum at 20 mL.