Ingredient review

Galactose Dehydrogenase

INCI: GALACTOSE DEHYDROGENASE

A gentle enzyme exfoliant that works by breaking down surface sugars, offering mild brightening without harsh scrubbing.

beautyskincareexfoliant

In plain English

Galactose dehydrogenase is an enzyme that helps remove dead skin cells by breaking down a sugar called galactose on the skin's surface. This process gently loosens and lifts away dull, flaky skin, revealing a smoother, brighter complexion underneath. Unlike strong chemical peels or gritty scrubs, this enzyme works slowly and gently, making it a good option for sensitive skin types.

Review score

Safety, usefulness, and evidence

3.8Good

3.8/ 5

Potentially useful with some tradeoffs

The evidence base is still emerging, so marketing claims deserve extra caution.

Risk flags are low for most users, though the finished product can still irritate.

Source: biotech
Evidence: emerging
Irritation: low
Clogging risk: low

How reviews are scored

Quick decision guide

Useful, but context matters

Galactose Dehydrogenase is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

Step 1Start with the score, then check the irritation and clogging risk before judging Galactose Dehydrogenase.
Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

Galactose dehydrogenase is a biotech-derived enzyme that catalyzes the oxidation of galactose, a sugar found in the outer layer of the skin. It is used in skincare as a mild exfoliant to promote cell turnover and improve skin texture.

How it works

When applied to the skin, galactose dehydrogenase reacts with galactose present in the stratum corneum (the outermost skin layer). This reaction helps break down the bonds holding dead skin cells together, allowing them to be shed more easily. The result is a gentle exfoliation that can improve skin smoothness and radiance without the irritation associated with stronger acids or physical scrubs.

Pros

Very gentle on skin

Unlike stronger exfoliants, this enzyme works slowly and is unlikely to cause stinging or redness, making it suitable for sensitive or compromised skin barriers.

Brightens without harshness

By gently removing surface dead cells, it can improve skin radiance and evenness over time without the downtime associated with chemical peels.

Cons and cautions

Limited research

There are few peer-reviewed studies specifically on galactose dehydrogenase in cosmetics, so its long-term benefits and optimal formulations are not well established.

Milder effects

For those with significant hyperpigmentation or rough texture, this enzyme may not provide the dramatic results that stronger exfoliants like glycolic acid can offer.

Best for

People with sensitive or reactive skin seeking gentle exfoliation
Those looking for a mild brightening ingredient without irritation

Use caution if

Individuals with known allergies to enzymes or fermentation-derived ingredients
Those seeking strong, rapid exfoliation results

Usage tips

Use in a serum or lotion after cleansing and before moisturizing for best absorption.

Start with once-daily application and increase to twice daily if no irritation occurs.

Always follow with a broad-spectrum sunscreen during the day, as exfoliation can increase sun sensitivity.

Safety summary

Galactose dehydrogenase is considered safe for topical cosmetic use at typical concentrations. It has a low irritation and comedogenic risk, but as with any enzyme, patch testing is recommended for those with sensitive skin or allergies.

Research notes

Research on galactose dehydrogenase in skincare is limited. Most evidence comes from ingredient supplier studies and small-scale trials. It is less studied than traditional exfoliants like AHAs or other enzymes such as papain.

Common label clues

Typical concentration: 0.1% to 1% in leave-on products
Regulatory status: Generally recognized as safe for cosmetic use in the EU and US when used as directed. Not a drug ingredient.
Common uses: Exfoliating serums, Brightening treatments, Peeling solutions
Environmental note: Produced via fermentation, which is generally considered a low-impact, sustainable manufacturing process compared to chemical synthesis.

Good to know

This ingredient is often found in enzyme peels and gentle resurfacing products.
It is typically derived from microbial fermentation, making it suitable for many natural and biotech-focused formulations.

Common questions

What is Galactose Dehydrogenase in beauty products?

What does Galactose Dehydrogenase do in a beauty product?

Is Galactose Dehydrogenase safe for most people?

Who should be careful with Galactose Dehydrogenase?

Individuals with known allergies to enzymes or fermentation-derived ingredients Those seeking strong, rapid exfoliation results

Research sources

CosIng - EU Cosmetic Ingredient DatabaseOpen PubMed - Enzyme exfoliation in dermatologyOpen Personal Care Magazine - Enzyme Exfoliants OverviewOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.