# COSRX Ultra-Light Invisible Sunscreen SPF50 PA++++

> COSRX Ultra-Light Invisible Sunscreen SPF50 PA++++ is a sheer Korean fluid sunscreen built on 66% aloe leaf water with niacinamide, using drometrizole trisiloxane, ethylhexyl triazone, Uvinul A Plus and terephthalylidene dicamphor sulfonic acid. It launched in the UK in May 2024. This is desk research, not a hands-on test.

- Canonical: https://thecastindex.com/beauty/cosrx-ultra-light-invisible-sunscreen-spf50
- Category: SPF
- Format: Fluid sunscreen
- Finish: Sheer, non-greasy
- Best for: A transparent daily SPF on bare skin or under tint
- Official: https://www.cosrx.com/products/ultra-light-invisible-sunscreen-spf50
- Reviewed: 2026-09-25
- Method: evidence-led desk review of official specifications — not an implied hands-on test

## Should you buy this?

A sheer SPF50 PA++++ fluid on a 66% aloe leaf water base, using Mexoryl XL, Mexoryl SX, ethylhexyl triazone and Uvinul A Plus. Choose it for a transparent protect step on oily or combination skin. UK retailer stock was limited when checked.

Skip this if you need water resistance, avoid witch hazel, or want a moisturising cream texture.

A sheer fluid protect step designed to disappear, whether the face is bare or under a skin tint.

## The formula

COSRX builds this SPF50 PA++++ sunscreen on aloe leaf water — 66% of the formula — with witch hazel water, niacinamide and hyaluronic acid. Its filters include two Mexoryl filters (XL and SX), ethylhexyl triazone and Uvinul A Plus, a combination permitted in the UK and EU.

The brand describes a sheer, fast-absorbing, non-greasy texture designed to stay invisible on all skin tones. That is a manufacturer description; The Cast Index has not tested protection or wear.

## Who it’s for

Oily and combination skin, or anyone who wants a very light fluid under skin tint or foundation rather than a cream.

## What should you check before buying?

UK high-street stock was patchy when checked, so confirm availability and the exact name before ordering. Witch hazel water is in the formula, which some sensitive skins avoid. No water resistance is claimed; reapply after swimming, sweating or towelling.

## How to use it

1. Apply as the final step of morning skincare, before makeup
2. Use enough to cover face, neck and ears evenly
3. Reapply at least every two hours outdoors, and after swimming, sweating or towelling
4. Remove at night with your usual cleanser

## Questions and answers

### Is COSRX Ultra-Light Invisible Sunscreen a chemical sunscreen?

Yes. It uses chemical filters — drometrizole trisiloxane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate and terephthalylidene dicamphor sulfonic acid — with no zinc oxide or titanium dioxide.

### Does COSRX Ultra-Light Invisible Sunscreen contain fragrance?

COSRX states it contains no artificial fragrance, and no ethanol appears on the UK ingredient list. Check the current pack if you react to botanical extracts such as witch hazel.

### When did COSRX Ultra-Light Invisible Sunscreen launch in the UK?

COSRX announced its UK launch in May 2024, through UK retailers and the brand’s own online storefronts.

## Explore the category

https://thecastindex.com/beauty/category/spf