Alpha Arbutin vs Licorice Root Extract

Alpha Arbutin: Targets melanin production; clinical data mainly involve combination creams. Licorice Root Extract: Some licorice-derived compounds are studied for uneven pigmentation.

Research updated 2026-10-25

Four alpha arbutin products lined up on white: three dropper serums and a pink cream tube

Five licorice root products on white, including two Acwell bottles, Éminence, Horbäach liquid extract and Versed

Which one?At a glance What it helps Diagrams Using both Strengths Results Safety How it works Products Questions

Which one is right for you?

Choose Alpha Arbutin if…

Consider for uneven tone; do not assume it matches prescription pigment treatments.

Mild uneven tone or dark marks
You want a gentler pigment option
You use daily sunscreen

Choose Licorice Root Extract if…

Consider as an optional pigment ingredient; independent clinical evidence is limited.

Mild uneven tone
Sensitive skin that dislikes stronger pigment actives
Modest expectations

Often combined

Can you use both?

A gentle brightening pairing, often in the same serum.

At a glance

● Alpha Arbutin

● Licorice Root Extract

Type

Pigment-targeting ingredient

Botanical pigment-targeting mixture

What it does

Targets melanin production; clinical data mainly involve combination creams.

Some licorice-derived compounds are studied for uneven pigmentation.

Best for

Melasma

Melasma; Uneven Skin Tone

Studied concentrations

A trial used 5% alpha-arbutin plus 2% kojic acid; this is not a recommended home strength.

Extracts are not standardized; the cited small study used a liquiritin cream.

When to use

On the schedule specified for the product or prescribed treatment.

Time to results

Usually assessed over 8–16 weeks

Irritation

May cause irritation or a rash; choose a compliant commercial formula.

Botanical extracts can cause allergy or stinging; check the complete formula.

Sensitive skin

Choose a simple formula and test a small area first. Avoid actively inflamed or broken skin unless the product is specifically directed for it.

Available

Prescription or cosmetic status depends on the active, formula and country; check the label.

What it helps

Compare uses by strength of evidence. Evidence level describes confidence in a benefit, not its size.

Evidence level

Alpha Arbutin

Licorice Root Extract

Limited evidenceEarly or small studies

Flat tan patches with soft irregular edges across the forehead and upper cheek of an adult with light skin, the surface completely smooth.

Melasma

A small trial supports a combined alpha-arbutin and kojic acid cream.

Melasma

A small study investigated a specific liquiritin cream.

Uneven Skin Tone

Possible pigment benefit is based on small compound-specific studies.

Insufficient evidence

Flat light-brown residual marks on a fair cheek.

Post-Inflammatory Hyperpigmentation

Independent benefit for post-acne marks is not established by these studies.

Sun Spots

The cited melasma and laboratory studies do not establish sun-spot clearance.

The front of a forearm on fair skin. Two pale patches with sharp edges sit against lightly tanned skin, and the difference between the patch and the skin around it is subtle.

Vitiligo

The reviewed sources do not establish this ingredient as a treatment for this concern.

Acne

The reviewed sources do not establish this ingredient as a treatment for this concern.

Vitiligo

The reviewed sources do not establish this ingredient as a treatment for this concern.

Acne

The reviewed sources do not establish this ingredient as a treatment for this concern.

Redness and fine superficial vessels across a light-skinned cheek and nose.

Rosacea

The cited pigment study did not test rosacea.

How it works

Alpha Arbutin mechanism diagram. Acts on pigment pathways: Laboratory models show reduced tyrosinase activity. Less melanin is made: Topical results depend on the finished formula. — Open full-size diagram
Diagram explanation and sources
Acts on pigment pathways: Laboratory models show reduced tyrosinase activity. Less melanin is made: Topical results depend on the finished formula.
Schematic illustration; not a measurement of skin penetration. Effects vary with ingredient identity and formulation.
Source 1 · Source 2

Licorice Root Extract mechanism diagram. Contains several active compounds: Glabridin and liquiritin have different actions. May help uneven pigmentation: Extracts and clinical evidence vary. — Open full-size diagram
Diagram explanation and sources
Contains several active compounds: Glabridin and liquiritin have different actions. May help uneven pigmentation: Extracts and clinical evidence vary.
Schematic illustration; not a measurement of skin penetration. Effects vary with ingredient identity and formulation.
Source 1

Using both in one routine

Built from where each one usually sits in a routine. Introduce one at a time.

Morning

Step 1

Cleanser

Step 2

Alpha ArbutinMorning or night

Step 3

Licorice Root ExtractMorning or night

Step 4

Moisturizer

Step 5

Sunscreen

Night

Step 1

Cleanser

Step 2

Alpha ArbutinMorning or night

Step 3

Licorice Root ExtractMorning or night

Step 4

Moisturizer

Strengths and forms

Concentrations

Alpha-arbutin percentages need a regional and product-type context. EU cosmetic limits are 2% in face creams and 0.5% in body lotions; these are safety limits, not proven optimal treatment doses.

0.5%

EU body-lotion ceiling

A maximum for the specified EU product category, not a minimum effective concentration.

EU face-cream ceiling

A maximum for the specified EU product category. It does not establish that 2% will work better than every lower-strength formula.

Choosing a strength: Check that the ingredient is alpha-arbutin. Beta-arbutin has different specifications and should not share the same strength scale.

Higher strengths: A higher concentration in a clinical combination study does not override current cosmetic restrictions or establish safe home use.

Formula matters: The extract or ingredient identity, purity and the finished formula matter. Hydroquinone impurities must be controlled.

Licorice root extract contains multiple compounds, including liquiritin and glabridin. Whole-extract percentages do not reveal the dose of these individual compounds.

Choosing a strength: Look for the named extract or purified compound and evidence for the finished product.

Higher strengths: There is no established universal percentage range or proof that higher whole-extract concentrations improve pigmentation.

Formula matters: A small study of liquiritin cannot establish a recommended strength for every licorice extract, species, or formulation.

Forms

Serum · Cream

When you’ll see results

Approximate windows, not promises.

● Alpha Arbutin

● Licorice Root Extract

First few weeks

First few weeksAssess tolerance first; pigment change is usually slower.

4–8 weeks

4–8 weeksSome studied regimens begin showing pigment improvement.

8–12 weeks

8–12 weeksA useful review point for benefit and irritation.

3–6 months

3–6 monthsMany melasma trials assess results over three to four months; recurrence is common.

6–12 months

6–12 monthsLong-term use depends on the active; follow a monitored plan rather than extending treatment automatically.

Safety and sensitive skin

Common reactions

May cause irritation or a rash; choose a compliant commercial formula.

Botanical extracts can cause allergy or stinging; check the complete formula.

When to stop

Stop for persistent burning, swelling, blistering or a new rash. Seek urgent care for breathing difficulty or a severe allergic reaction.

Sensitive or inflamed skin

Choose a simple formula and test a small area first. Avoid actively inflamed or broken skin unless the product is specifically directed for it.

Important limits

Do not use a cosmetic product as a substitute for diagnosis of an unexplained, changing or persistent skin problem.

Pregnancy

Because it releases small amounts of hydroquinone, ask rather than assume; pregnancy-specific data are limited. Ask the doctor managing your pregnancy. Azelaic acid and strict sun protection are the usual suggestions meanwhile.

Data are limited; ask the clinician managing your pregnancy.

How it works

In the skin

On the skin. The finished product delivers alpha arbutin in a particular vehicle.

Entering skin. Below the 500 Da guideline; delivery still depends on the formula, solubility, stability and skin condition. Size does not prove effectiveness or penetration depth.

Conversion. No activation step is established as necessary for its intended topical role.

Skin response. Laboratory models show reduced tyrosinase activity and melanin production; clinical delivery and formula matter.

Additional effects. Proposed pathways do not establish a measured depth of delivery or clinical benefit beyond the studies cited.

On the skin. The finished product delivers licorice root extract in a particular vehicle.

Entering skin. No single molecular mass. The 500 Da guideline cannot be applied to this whole ingredient family or mixture.

Conversion. No activation step is established as necessary for its intended topical role.

Skin response. Compounds such as liquiritin and glabridin have different pigment-related actions; they are not interchangeable extracts.

Additional effects. Proposed pathways do not establish a measured depth of delivery or clinical benefit beyond the studies cited.

Getting in

Below the 500 Da guideline; delivery still depends on the formula, solubility, stability and skin condition. Size does not prove effectiveness or penetration depth.

No single molecular mass. The 500 Da guideline cannot be applied to this whole ingredient family or mixture.

Product examples

Alpha Arbutin

The Ordinary Alpha Arbutin 2% + HA
Naturium Alpha Arbutin Serum 2%
COSRX The Alpha-Arbutin 2 Discoloration Care Serum

Licorice Root Extract

Anua Azelaic Acid 3 Cica Skin Clarifying Toner

Common questions

Alpha Arbutin:What should I choose alpha arbutin for?

Consider for uneven tone; do not assume it matches prescription pigment treatments.

Alpha Arbutin:How strong is the evidence?

A 30-person split-face trial tested alpha-arbutin together with kojic acid. Laboratory results cannot establish clinical efficacy alone, and nonsignificant differences do not prove equivalence.

Licorice Root Extract:What should I choose licorice root extract for?

Consider as an optional pigment ingredient; independent clinical evidence is limited.

Licorice Root Extract:How strong is the evidence?

A 20-woman split-face study tested a specific liquiritin cream for four weeks with sun protection. It does not establish that all licorice extracts treat melasma or rosacea.

Sources