Trehalose

Overview

Trehalose is a disaccharide sugar (two glucose units joined by an unusual alpha-alpha-1,1 bond) produced commercially through enzymatic fermentation of starch. The unusual bond gives trehalose a very high stability and a unique water-binding behavior.

It is found naturally in many plants, fungi, and insects, where it plays a role in protecting cells from dehydration and freezing. Resurrection plants (which survive complete dehydration and then revive when watered) accumulate large amounts of trehalose as part of their drought-survival chemistry. This natural anti-desiccation role is what makes trehalose interesting in skincare.

The cosmetic grade is a fine white crystalline powder, essentially scentless, with a mild sweetness about 45% as sweet as table sugar. It dissolves easily in water.

Shelf life is 3+ years stored cool, dry, and sealed.

Trehalose has been the focus of significant cosmetic research over the last 15 years because of its unusual water-retention properties. It is positioned as a “premium humectant” in many serious skincare formulations.

What it does in a formula

Trehalose binds water in an unusual way — not just at the surface, but it forms a glass-like protective matrix that protects cells and proteins from drying and freezing damage. Topically this translates to long-lasting hydration and protection from environmental stress.

Compared to glycerin and sorbitol, trehalose provides comparable humectant action with a noticeably lighter, less tacky feel. It is also reported to have a “smoothing” effect on skin texture over weeks of consistent use.

The molecule is also a mild stabilizer for sensitive ingredients (vitamins, peptides, some active extracts) in finished formulations, helping them retain activity over the product’s shelf life.

In a formula it adds a soft, refined hydrating effect and a mild brand-positioning story.

How to use

Add to the water phase. Tolerates heat-and-hold to 90 C without degradation.

Usage rates by product type:

• Premium face serums: 2-5%
• Face creams (anti-ageing positioning): 2-5%
• Eye creams: 1-3%
• Body lotions (premium): 1-3%
• Hand creams (winter repair): 2-5%
• Lip products: 1-3%
• Hair masks (premium): 1-3%

Best for / Worst for

Best for: premium face serums and creams, anti-ageing positioning, eye creams, winter repair products, formulas pairing with active ingredients that benefit from trehalose’s stabilizing effect, sensitive skin formulas.

Worst for: budget formulas (trehalose is significantly more expensive than glycerin or sorbitol), formulas where you want a strong sticky-humectant feel.

Common pitfalls

Cost vs. benefit. Trehalose is 5-10x more expensive per gram than glycerin. For body lotions and large-format products where the humectant feel is the main goal, glycerin is more economical. For premium face products where the lighter feel and stability boost matter, trehalose is worth the cost.

Expecting “wow” results from trehalose alone. It is a sophisticated humectant but not a hero active. Pair with real performance ingredients (peptides, vitamin C derivatives, ceramides) for visible results.

Confusing with regular sugar. Trehalose looks like white sugar but it is a specific disaccharide with unique properties. Substituting glucose or sucrose for trehalose does not work the same way.

Substitutes

• Sorbitol — close on non-tacky feel, much cheaper, no stabilizing effect.
• Glycerin — classic humectant, stickier, much cheaper.
• Sodium PCA — different chemistry, similar light humectant.
• Beta-glucan — different chemistry, similar premium hydration positioning.