# COSRX Advanced Snail 96 Mucin Power Essence

> COSRX Advanced Snail 96 Mucin Power Essence is a fragrance-free hydrating essence listed at 96% snail secretion filtrate with sodium hyaluronate. The brand positions it for all skin types, including sensitive skin, as a glass-skin prep step. Glow statistics on the official page are from a 20-adult manufacturer study in Korea in 2025, not a Cast Index test.

- Canonical: https://thecastindex.com/beauty/cosrx-advanced-snail-96-mucin-power-essence
- Category: Skin prep
- Format: Essence
- Finish: Hydrated
- Best for: Lightweight barrier-support hydration
- Official: https://www.cosrx.com/products/advanced-snail-96-mucin-power-essence
- Reviewed: 2026-08-13
- Method: evidence-led desk review of official specifications — not an implied hands-on test

## Should you buy this?

A lightweight hydrating essence for Couture glass skin when the face needs slip, not weight. COSRX lists 96% snail secretion filtrate with sodium hyaluronate, and positions it for all skin types including sensitive. Clinical percentages on the brand site come from a 20-person manufacturer study in Korea (May–June 2025) — useful context, not an independent Cast Index test.

Skip this if you need a vegan formula (the filtrate is snail-derived), a treatment acid, or a heavy cream. Skip also if you want this desk to certify “clinically proven glow” — those figures are brand-reported.

Lightweight barrier hydration under Couture glass skin when the face needs slip, not weight.

## The formula

COSRX builds this essence around snail secretion filtrate at a stated 96% concentration, with betaine, sodium hyaluronate, allantoin and panthenol on the published INCI. The brand’s own comparison table claims a much higher mucin percentage than a “typical essence.” That is marketing context, not a Cast Index assay of competing bottles.

Texture is described as lightweight and fast-absorbing — the reason it sits in a glass-skin kit rather than as a night cream. COSRX states the harvest does not harm snails; the formula is still animal-derived, so it is not vegan. Anyone buying for a vegan brief should stop here.

## Who it’s for

The official page targets sensitive skin, post-breakout marks, dryness and early dullness. The desk uses a narrower brief: a hydrating layer that will not fight a sheer, light-catching base. It is not an AHA, not a retinol, and not a spot treatment.

Brand-reported results include a large moisture increase after one use and a 35% glow / 80% redness-reduction figure from the 20-person 2025 study. Those numbers describe that manufacturer test. They are not a promise for every face, and they are not medical claims about barrier disease.

## Why it’s in the edit

Couture glass skin fails when prep is either too matte or too greasy. This essence is the slip layer: hydration that can sit under SPF and a radiant base without adding mask weight. New York Post Most Wanted 2024 is press recognition cited by the brand — not a Cast Index award.

Amazon UK/US search links are live for this SKU because it is widely sold there. Shopping links do not change the ranking of finishes or whether the product stays in the archive.

## How to use it

1. After cleansing and toning, apply a small amount to the face
2. Pat with fingertips until absorbed
3. Follow with moisturiser, then SPF in the morning, then makeup if needed
4. Patch test if you have a history of reacting to snail mucin or the published INCI

## How it compares

| Role | COSRX Snail 96 Essence | Ordinary HA 2% + B5 | Anua Heartleaf 77 Toner |
| --- | --- | --- | --- |
| Job | Lightweight mucin hydration | Multi-weight HA + ceramides | Soothing toner water |
| Hero material | Snail secretion filtrate 96% | Hyaluronic acid + ceramides | Heartleaf extract |
| Vegan? | No — snail-derived | Check current INCI | Check current INCI |
| Glass-skin use | Slip under base | Hydration before makeup | Calm prep |

## Questions and answers

### Is COSRX Advanced Snail 96 Mucin Power Essence vegan?

No. It contains snail secretion filtrate. COSRX describes an ethical collection process, but the ingredient is animal-derived.

### Can I use COSRX Snail 96 under makeup?

Yes. COSRX positions the essence as a fast-absorbing hydrating base under makeup or sunscreen. That is brand usage guidance, not a wear test by this desk.

### Are the glow and redness percentages independently verified?

No. COSRX attributes those figures to a 20-adult study at Dermacosmetic Skin Science Laboratory in Korea from 26 May to 10 June 2025. Treat them as brand-reported.

### What finish does COSRX Snail 96 serve on The Cast Index?

Couture glass skin — a lightweight hydration step so a radiant base can sit on plump-looking skin without cream weight.

### Is COSRX Snail 96 a treatment for acne?

No. The brand mentions post-breakout marks and sensitive skin as use cases. This desk does not treat the essence as medicine.

## Explore the category

https://thecastindex.com/beauty/category/skin-prep