# COSRX HA Essence vs Hydrium Ampoule

**Question answered:** Should I choose COSRX Hyaluronic Acid Hydra Power Essence or Hydrium Triple Hyaluronic Moisture Ampoule?

**Short answer:** Choose Hyaluronic Acid Hydra Power Essence if you want the simplest possible hydrating step: seven ingredients, sea buckthorn water, sodium hyaluronate and panthenol, with no exfoliating acids. Choose Hydrium Triple Hyaluronic Moisture Ampoule if your skin is dry or flaky and you want a thicker ampoule with three forms of hyaluronic acid plus gentle PHAs. Both are sold as fragrance free.

By Nora Ellison. Published 2026-10-29. Data is taken from manufacturer labels; the products have not been tested.

## What this means for you

### Start with what you notice

Both add a layer of hydration under moisturizer. Pick by texture and whether you want a little gentle exfoliation in the mix.

### The ingredient names, translated

Hyaluronic acid is a humectant that holds water in the top layer of skin. The essence uses one form, sodium hyaluronate, in a very short formula. The ampoule uses three forms and adds gluconolactone and lactobionic acid, polyhydroxy acids (PHAs) that exfoliate gently and also attract water.

### How to decide

- Want a minimal, acid-free hydrating step? Hyaluronic Acid Hydra Power Essence.
- Dry, flaky skin and you like a thicker texture? Hydrium Triple Hyaluronic Moisture Ampoule.
- Very reactive skin or already using acids? The essence has no exfoliating acids.

### What to expect

Hydrating serums make skin feel softer and look plumper while you use them. Follow with a moisturizer to hold that water in. We haven't tested either product.

General guidance, not a test of these products: [How hydrating ingredients work](https://pmc.ncbi.nlm.nih.gov/articles/PMC4885180/); [AAD: dermatologists' tips to relieve dry skin](https://www.aad.org/public/everyday-care/skin-care-basics/dry/dermatologists-tips-relieve-dry-skin). Each product's label source is linked on its product page.

## Minimal essence vs richer ampoule

[COSRX Hyaluronic Acid Hydra Power Essence](product:cosrx-hyaluronic-acid-hydra-power-essence) lists seven ingredients: sea buckthorn (Hippophae rhamnoides) water, butylene glycol, glycerin, 1,2-hexanediol, sodium hyaluronate, [panthenol](/ingredients/panthenol/) and ethyl hexanediol. COSRX describes it as an oil-free gel-type essence for dry, rough-feeling skin.

[COSRX Hydrium Triple Hyaluronic Moisture Ampoule](product:cosrx-hydrium-triple-hyaluronic-moisture-ampoule) is a 40 mL ampoule with a viscous texture. It lists glycerin, sodium hyaluronate, [hyaluronic acid](/ingredients/hyaluronic-acid/), hydrolyzed hyaluronic acid, panthenol, gluconolactone and lactobionic acid. COSRX positions it for dry, dehydrated and flaky skin.

> **Skin Realist check:** three kinds of hyaluronic acid sounds impressive, but the deciding question is simpler: do you want PHAs in this step or not?

## Label differences worth knowing

Only the ampoule lists exfoliating acids, so pause it if you're already using a strong acid or retinoid. See our [glass skin layering guide](/articles/glass-skin-routine-hydration-layering/) and our [CeraVe vs COSRX hyaluronic acid serum comparison](/comparisons/cerave-vs-cosrx-hyaluronic-acid-serum/).

## Manufacturer sources

- [COSRX Hyaluronic Acid Hydra Power Essence](https://www.cosrx.com/products/hyaluronic-acid-hydra-power-essence)
- [COSRX Hydrium Triple Hyaluronic Moisture Ampoule](https://www.cosrx.com/products/hydrium-triple-hyaluronic-moisture-ampoule)

Sources and label-check dates are recorded on the product pages.

| Product | Price | Key ingredients | Skin types | Fragrance | Flagged ingredients | Size | Source | Buy |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| [COSRX Hyaluronic Acid Hydra Power Essence](https://dermalguide.com/products/cosrx-hyaluronic-acid-hydra-power-essence/) | $20.00 at [Stylevana](https://www.awin1.com/pclick.php?p=43018980488&a=3132625&m=90791) (affiliate), checked 2026-10-29 07:35 UTC | Sodium Hyaluronate | Brand doesn't say | Marketed as fragrance free | No flags recorded; not a safety guarantee | Brand doesn't list it | [Manufacturer label](https://www.cosrx.com/products/hyaluronic-acid-hydra-power-essence), checked 2026-10-10 | [Amazon (affiliate)](https://amzn.to/4hRrbdr) |
| [COSRX Hydrium Triple Hyaluronic Moisture Ampoule](https://dermalguide.com/products/cosrx-hydrium-triple-hyaluronic-moisture-ampoule/) | $20.80 at [Stylevana](https://www.awin1.com/pclick.php?p=43018996001&a=3132625&m=90791) (affiliate), checked 2026-10-29 07:35 UTC | Hyaluronic Acid | Brand doesn't say | Marketed as fragrance free | No flags recorded; not a safety guarantee | 40 ml | [Manufacturer label](https://www.cosrx.com/products/hydrium-triple-hyaluronic-moisture-ampoule), checked 2026-10-10 | [Amazon (affiliate)](https://amzn.to/4zuV6iM) |

## Which to choose

Consider COSRX Hyaluronic Acid Hydra Power Essence when: You want a minimal, seven-ingredient hydrating essence; You want no exfoliating acids in this step.

Consider COSRX Hydrium Triple Hyaluronic Moisture Ampoule when: Your skin is dry or flaky and you like a thicker ampoule; You want three forms of hyaluronic acid plus gentle PHAs.


## Questions

### Which has exfoliating acids?

The Hydrium ampoule lists gluconolactone and lactobionic acid, both polyhydroxy acids. The Hydra Power Essence lists none.

### What sizes are they?

COSRX describes the Hydra Power Essence as 100 mL and lists the Hydrium ampoule at 40 mL.

### Are they fragrance free?

Both are sold as fragrance free, and neither recorded list includes fragrance or essential oils.