Licorice Root Extract: The Plant-Powered Skin Brightener

Licorice root is the brightening ingredient that has been quietly outperforming hydroquinone in sensitive-skin studies for two decades. Its two star molecules — glabridin and liquiritin — switch off tyrosinase, the enzyme that turns skin brown when triggered by sun, hormones, or post-inflammatory chaos. It works more slowly than the controversial heavyweight hydroquinone, but without the rebound darkening, the long-term safety concerns, or the irritation. For anyone with melasma, post-acne marks, or stubborn dark spots that haven't responded to gentler brighteners, licorice deserves a place in the routine. For the wider brightening map, our kojic acid guide is the natural sibling read.

What licorice root extract actually is

Licorice root extract is derived from the root of Glycyrrhiza glabra (true licorice), Glycyrrhiza uralensis (Chinese licorice), or Glycyrrhiza inflata, all members of the legume family that grow widely across the Mediterranean, central Asia, and China. The root has been used in traditional Chinese and Ayurvedic medicine for over four thousand years — initially as a digestive aid and anti-inflammatory tonic. Its skin-brightening reputation goes back centuries in East Asian beauty traditions, and modern cosmetic science has since identified exactly why it works.

Two molecules carry most of the brightening load. Glabridin is the gold-standard isoflavonoid, found primarily in Glycyrrhiza glabra root. In vitro studies show glabridin inhibits tyrosinase activity by roughly 50% at very low concentrations and outperforms hydroquinone on safety. The second star is liquiritin, a flavonoid that works through a different mechanism — it disperses existing melanin within the cell rather than blocking new production. The combination of glabridin (production blocker) and liquiritin (pigment disperser) gives licorice extract its uniquely dual-action effect. Whole-root extracts also contain glycyrrhizin, glycyrrhetinic acid, and licochalcone A — all of which contribute anti-inflammatory action.

Cosmetic-grade licorice extract is used at 0.5% to 2% in finished products, with the most active formulations specifying a minimum glabridin content (typically 10–40% of the extract). Standardised glabridin-rich extracts are more expensive than crude licorice extract, but they are also far more effective. The combination of brightening and soothing makes licorice unusual — most actives that brighten also irritate. Licorice does the opposite. Our melasma treatment guide covers where it sits in the pigmentation toolkit.

How licorice root works on skin

The brightening cascade in skin starts with the enzyme tyrosinase, which converts the amino acid tyrosine into DOPA and then into melanin pigment. UV exposure, hormonal triggers (the cause of melasma), and post-inflammatory irritation all upregulate tyrosinase, which is why dark spots show up after sun, after pregnancy, and after blemishes heal. Glabridin binds to the active site of tyrosinase and blocks new melanin production at the source. Liquiritin then mops up the existing melanin that has already been produced, dispersing it within the skin cell so it sheds away with natural cell turnover. Together they brighten existing marks while preventing new ones — the rare ingredient that works both ends of the pigment cycle.

Licorice also delivers a useful side benefit through licochalcone A and glycyrrhetinic acid — both potent anti-inflammatory molecules. This matters for pigmentation because inflammation itself triggers tyrosinase. By calming the inflammatory cascade, licorice tackles post-inflammatory hyperpigmentation at its root cause as well as treating the visible result. For the wider PIH story, our post-acne marks guide walks through the routine. Compared to hydroquinone, licorice is slower (8–12 weeks rather than 4–6) but vastly safer for long-term use — there is no risk of ochronosis, no rebound darkening, and no irritation cycle.

Effective concentrations are 0.5% to 2% of total extract, with at least 10% glabridin content if specified on the label. Below 0.5% the brightening effect is weak. Above 2% there is no incremental benefit and the cost climbs sharply.

Who should use it (and who shouldn't)

Licorice extract is appropriate for almost everyone with pigmentation concerns. It is especially valuable for sensitive skin, rosacea-prone skin, and Fitzpatrick IV–VI skin types where stronger brighteners like hydroquinone carry higher ochronosis and post-treatment-darkening risk. It is widely considered safe for pregnancy and breastfeeding (it is topical and the systemic absorption is negligible), making it one of the few effective brighteners pregnant women can use. It is non-comedogenic and won't trigger acne.

The few people who should be cautious are those with a confirmed allergy to legumes (rare), or those who take warfarin or other anticoagulants (very high systemic doses of licorice can theoretically interact, though topical use is unlikely to be a concern). Patch test for 48 hours if you have a history of botanical allergies. Everyone else can layer licorice extract confidently — it is one of the gentlest effective brighteners available.

How to actually use it

Licorice works any time of day, layered with anything. In a brightening routine it is typically used twice daily, after cleansing and before moisturiser. In the morning, layer it under broad-spectrum SPF 50 — UV protection is the single biggest factor that determines whether your pigment will fade, regardless of which brightener you use. At night, layer it before a peptide or retinoid cream. Consistent twice-daily use for 8–12 weeks is the realistic timeframe to see visible fading.

Pair it with: vitamin C (the dream brightening duo — tyrosinase blocked at two points), kojic acid (another tyrosinase pathway blocker for stubborn marks), alpha-arbutin (gentler stepping stone), tranexamic acid (specifically for melasma), niacinamide, and mugwort (calming partner). The Dr Crazy Millionaire Glow Serum stacks vitamin C with niacinamide so the brightening pathways amplify each other. Don't pair: at the same step with very high-strength benzoyl peroxide (can oxidise the polyphenols) — separate them across AM/PM.

Top licorice root products compared

6 mistakes that ruin licorice root results

1. Expecting hydroquinone speed. Licorice works gently and steadily, not aggressively. Plan on 8–12 weeks of consistent twice-daily use to see meaningful fading. Six weeks in, the change can still be subtle. Stick with it.

2. Skipping SPF. Sun exposure re-triggers tyrosinase, which means every UV-exposed day undoes a percentage of your brightening progress. Without daily SPF 50, even the best licorice serum produces minimal results. Our complete hyperpigmentation guide covers the full sun-discipline protocol.

3. Buying unstandardised extracts. "Glycyrrhiza glabra extract" on the label tells you nothing about glabridin content. The premium specs are 10–40% glabridin standardised. If a product doesn't specify, the glabridin content is likely low and the result will be weaker.

4. Using only once a day. Twice daily is the minimum for visible results within 12 weeks. Once a day means slower progress or no visible change. Tyrosinase keeps producing melanin around the clock — your blocker should be present around the clock too.

5. Treating it as a standalone melasma cure. Melasma is hormonally driven and notoriously stubborn. Licorice works well as part of a stack with tranexamic acid, niacinamide, and SPF — not as a solo treatment. For severe melasma, see a dermatologist.

6. Confusing licorice extract with licorice candy oil. Anise oil (the flavour in licorice sweets) is not licorice root extract. Look for "Glycyrrhiza glabra root extract" specifically on the INCI.

Frequently asked questions

Is licorice root as effective as hydroquinone?

It is slower than hydroquinone but significantly safer for long-term use. In sensitive-skin and Fitzpatrick IV–VI populations where hydroquinone can cause ochronosis or rebound darkening, licorice is widely considered the better choice. For comparison detail see our alpha-arbutin vs hydroquinone guide.

Is licorice extract safe during pregnancy?

Topical licorice extract at cosmetic concentrations is widely considered safe during pregnancy and is one of the few effective brighteners pregnant women can use. As always, check with your clinician for your specific situation.

Can licorice root help melasma?

Yes, especially as part of a stack with tranexamic acid, niacinamide, and SPF. Melasma is a multi-factor condition driven by hormones and UV, so it rarely responds to any single ingredient. Our melasma at-home treatment guide walks through the protocol.

Does licorice extract have a strong smell?

Pure licorice extract has a mild, faintly sweet earthy smell. Most formulations are essentially fragrance-free. If a licorice-marketed product smells strongly of anise or fennel, that scent is likely added flavouring, not the active extract itself.

Can I use licorice root with retinol?

Yes. Retinol speeds up cell turnover, which helps the melanin that licorice has dispersed to shed faster. Use licorice morning and night, retinol at night. The combination is one of the more effective pigment-fading stacks available without prescription.

Will licorice fade old scars?

It fades the pigmented (brown) component of post-acne and post-injury marks, which is the most common type. It does not change the texture of true scars (depressed or raised) — for that you need microneedling, lasers, or other procedural treatments.

Can licorice root cause irritation?

It is one of the most non-irritating brighteners available — its secondary effect is actually anti-inflammatory. The very rare reports of irritation are usually due to other ingredients in the formula (preservatives, fragrance, or co-actives), not the licorice itself.

Should I combine licorice with vitamin C?

Yes. Vitamin C inhibits a different step in melanin production and adds antioxidant photoprotection on top. The two together are a foundational brightening pair, which is why our vitamin C guide covers the same pigment story from the other side.

Bottom line

Licorice root extract is one of the smartest brightening choices for anyone whose skin doesn't tolerate stronger options. Its dual-action effect — blocking tyrosinase and dispersing existing melanin at the same time — makes it work both ends of the pigment cycle. It is gentle enough for pregnancy, dark Fitzpatrick types, and sensitive skin, and effective enough that dermatologists routinely include it in melasma and PIH protocols. The trade-off is speed; you need 8–12 weeks of consistent twice-daily use to see meaningful change. For the sister-ingredient story, our mugwort guide covers another Korean-beauty staple that pairs well.

For best results, stack licorice with vitamin C, niacinamide, and daily SPF 50 — and consider adding tranexamic acid if your pigmentation is hormonally driven. Skip the SPF and even the best licorice routine will disappoint. For the wider concern-level walk-through, our dark spots guide covers the full fading protocol. Bottom line: licorice is the gentle, sustainable, evidence-backed brightener that delivers results without the controversy of hydroquinone.