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Theanine

What Theanine is & what it does

Theanine is an amino acid found naturally in tea leaves, used in cosmetics as a conditioning and antioxidant ingredient. In skincare and sunscreen formulas it is added to help support a smooth, hydrated skin feel and to contribute mild antioxidant activity. A notable property is its high water solubility, which lets it blend easily into water-based serums and lotions.

Is Theanine safe in skincare?

Theanine is an amino acid naturally found in tea and is generally regarded as a gentle, well-tolerated cosmetic ingredient when used in skincare. It is used at low levels for conditioning and antioxidant support. As with any ingredient, tolerance can vary, so patch testing is sensible if you have reactive skin.

What does Theanine do in skincare?

In skincare, Theanine acts as a skin-conditioning and antioxidant ingredient. It helps support a smooth, hydrated feel and can contribute mild antioxidant activity in water-based serums and lotions. Its high water solubility makes it easy to formulate into lightweight products.

Is Theanine natural or synthetic?

Theanine occurs naturally in tea leaves, so it can be sourced from natural material, though cosmetic-grade Theanine may also be produced through fermentation or synthesis. The molecule is the same regardless of source. Brands that prioritize natural sourcing will usually state this on the label.

Sunscreens with Theanine

We rate 9 sunscreens that contain it:

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