What Is Trehalose? Benefits & How It Works

What is Trehalose?

Trehalose is a natural sugar made of two glucose molecules joined together. Plants, fungi (including yeast and mushrooms), bacteria and insects make it, often as a survival tool: some organisms can dry out almost completely and then recover, and trehalose is part of how they protect their cells while they are dry. Humans do not make trehalose in their skin.

In skincare, trehalose is used as a humectant, which means it attracts water and helps skin hold onto it. It is a gentle, non-sticky ingredient that sits in the same family of moisture-binding helpers as glycerin, but it is much less common. In ingredient lists it appears simply as Trehalose, and the cosmetic grade is typically made from starch using enzymes rather than extracted from mushrooms.

Source

Found in	Trehalose (INCI name)
Origin	Occurs naturally in plants, yeast, mushrooms, bacteria and insects; cosmetic grade is typically produced from starch with enzymes
Also known as	Alpha,alpha-trehalose, mushroom sugar, mycose

Top features and benefits

Attracts and holds water in the skin	Helps protect skin cells from drying out	Light, non-sticky feel
Supports a soft, smooth look	Generally well tolerated	Water-soluble and easy to formulate
Works alongside glycerin and hyaluronic acid	Suitable for dry and dehydrated skin	Fragrance-free and gentle in nature

How Does It Work?

Think of trehalose as a moisture magnet with a protective side. Its structure lets it bond with water, so when it is applied to skin it draws water in and helps keep it there. This gives skin a softer, plumper, more comfortable feel, especially in dry weather or air-conditioned rooms.

The protective side is what makes trehalose different from a plain humectant. In laboratory and biology research, trehalose has been shown to shield proteins and cell membranes when water is scarce, which is how it helps organisms survive drying out in nature. Researchers think it can play a similar stabilizing role in cosmetic formulas and on skin, helping cells cope with dehydration, though most of this protective research is lab-based rather than studies of trehalose creams on people.

In real-life use, trehalose is usually one of several hydrating ingredients in a formula. It is most helpful for dry or tight-feeling skin, and it is often paired with glycerin, hyaluronic acid or ceramides, so a skin barrier is supported while water is held in.

Frequently Asked Questions

What does trehalose do for skin?

Trehalose helps skin attract and hold onto water, which supports a soft, hydrated feel. Its protective effect on proteins and cell membranes in dry conditions has been shown in laboratory research.

Is trehalose a sugar? Is it bad for skin?

Yes, trehalose is a sugar made of two glucose units, but putting it on your skin is very different from eating sugar. Topical trehalose is used as a gentle moisturizing ingredient and is not linked to the problems associated with dietary sugar.

How does trehalose compare with glycerin?

Both are humectants that draw water into the skin. Glycerin has far more independent research behind it. Some supplier-sourced claims say trehalose performs as well or better, but independent evidence is limited, so it is fair to treat them as similar-type ingredients rather than rank one above the other.

Is trehalose safe for sensitive skin?

Trehalose is generally considered gentle and well tolerated, and it is not a known common irritant. As with any new product, patch testing first is sensible if your skin is reactive.

Is trehalose suitable for oily or acne-prone skin?

Yes, in most cases. Trehalose is water-based and non-greasy, so it can add hydration without a heavy feel. Oily skin can still be dehydrated, and a light humectant can help with that.

Can I use trehalose with hyaluronic acid, niacinamide or vitamin C?

Yes. Trehalose is a simple sugar and does not clash with common actives. It is often paired with other hydrators, and it can sit in the same routine as niacinamide or vitamin C.

Is trehalose vegan?

Trehalose is a plant- and microbe-derived sugar, and cosmetic grades are typically made from starch, so it is usually considered vegan. Check the brand's own sourcing statement if it matters to you.

Does trehalose come from mushrooms?

Trehalose is found in mushrooms and was once called mushroom sugar, but commercial trehalose for cosmetics is typically produced from starch using enzymes, not extracted from mushrooms.