The Ordinary EUK 134 0.1%EUK 134 0.1%

The Ordinary The Ordinary EUK 134 0.1% superoxide antioxidant serum
The Ordinary swatch of The Ordinary EUK 134 0.1%
The Ordinary EUK 134 0.1%

Regimen Step 2: Treat

An antioxidant formula that brightens your skin.
Price reduced from 13.30 USD to 10.24 USD
Enjoy 23% off for Slowvember. Terms & Conditions apply.

Targets Antioxidant Support, Dullness

Suited to All Skin Types

Format Anhydrous Serum

Key ingredients
Ethylbisiminomethylguaiacol Manganese Chloride
Price reduced from 13.30 USD to 10.24 USD
Enjoy 23% off for Slowvember. Terms & Conditions apply.
Use code SLOWMPES for a free Multi-Peptide Eye Serum - 15ml with every order.
Plus free shipping until the end of November. Conditions apply.



In your regimen

  • Prep
  • Step 2: Treat
  • Seal

Use after cleansing and water-based serums, before oils, suspensions or creams.


EUK 134™ 0.1%, is an oil-like serum designed to continuously support your skin with antioxidants and leave your skin looking brighter. By using a self-regenerating molecule that mimics the effects of two powerful antioxidants found naturally in your skin, this high-strength serum actively protects your skin from the visible effects of damage caused by environmental stressors.

The low price of this formula does not reflect EUK-134™'s extremely high potency. EUK-134™ is by far one of the strongest antioxidants available. While EUK-134™ itself is very costly, the suggested concentration in any formula is below 0.05% and most formulas do not use this maximum suggestion. Our formula uses EUK-134™ at an extremely high 0.1% concentration and we do not believe any product on the market today uses a higher concentration than this amount.

EUK-134™ is a trademark of Lucas Meyer Cosmetics Canada Inc. Neither DECIEM nor The Ordinary is affiliated with Lucas Meyer Cosmetics Canada Inc.

How to use

Product Directions
  • Apply a few drops to the face in the morning and evening. 
  • Alternatively, mix with other products to enhance their antioxidant capacity. 
  • If irritation occurs, rinse off, cease use, and consult a physician. 
  • Use only as directed on unbroken skin. 
  • Patch testing prior to use is advised. 
  • Keep out of reach of children.

Always patch test before use.

View Customer disposal instructions.

When to use

Use in AM

Use in PM

Good for

6 months after opening.

How to build a skin regimen

Step 1: Prep 3

Cleanse the skin and prepare it to receive active ingredients.

Step 2: Treat 9

Address specific skin concerns using targeted formulas. Always check each product's Usage Details to ensure products are compatible in the same routine.

Step 3: Seal 3

Lock in benefits and support the skin barrier.


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