As consumers seek alternatives to harsh brightening agents, licorice root's reputation as a potent, plant-derived tyrosinase inhibitor and anti-inflammatory makes it a focal point. Its dual action on pigment and redness aligns perfectly with the market's demand for gentle, multi-functional ingredients that deliver a clear, even complexion.
Benefits
Inhibits tyrosinase to reduce hyperpigmentation
Soothes redness and irritation
Provides antioxidant protection against free radicals
Helps disperse existing melanin for a more even tone
May assist in regulating sebum production
Example uses
Hyperpigmentation serums
Soothing moisturizers for sensitive or post-procedure skin
Eye creams for dark circles
Spot treatments
Calming facial cleansers
Mechanism of action
Licorice root's primary mechanism for skin brightening is mediated by glabridin, a key isoflavonoid that directly inhibits tyrosinase, the enzyme essential for melanin synthesis. This action prevents the formation of new pigment. Simultaneously, the compound liquiritin aids in the de-pigmentation of existing spots by dispersing melanin. Another major component, glycyrrhizin (or glycyrrhizic acid), provides potent anti-inflammatory effects comparable to corticosteroids by inhibiting inflammatory mediators like prostaglandins and cytokines, which effectively soothes redness and irritation.
Clinical evidence · Moderate
Numerous in-vitro studies confirm potent tyrosinase inhibition and anti-inflammatory action. Small-scale human clinical trials have shown efficacy for melasma and post-inflammatory hyperpigmentation (PIH), though larger, double-blind controlled studies are less common than for agents like hydroquinone or retinoids.
Effective concentration range
0.1–4% for extract; efficacy is dependent on active constituent concentration (e.g., glabridin at 0.05-0.1%).
Formulation notes
Generally stable in aqueous solutions and compatible with a wide range of cosmetic ingredients. Efficacy is highly dependent on the quality and concentration of the extract, particularly its glabridin content, which is oil-soluble and requires an appropriate delivery system.
Watchouts
The term 'Licorice Root Extract' is not standardized; efficacy varies drastically based on the concentration of active compounds like glabridin. Many formulas engage in 'angel dusting,' using ineffective trace amounts for marketing claims.
The primary controversy is one of inconsistent quality and 'angel dusting'. As there is no industry standard for the concentration of active compounds like glabridin within a generic "licorice root extract," a product's presence on an ingredient list provides no guarantee of its bioactivity. Brands often leverage the ingredient's positive reputation without using a sufficiently potent (and more expensive) extract to deliver the claimed brightening or soothing results.
Market positioning
Industry markets it as a gentle, natural skin brightener and a 'hydroquinone alternative' for sensitive skin. It is frequently positioned within K-beauty and 'clean' narratives to address dark spots, acne scars, and redness. What it actually does is act as a legitimate, multi-pathway active that both inhibits new pigment formation and calms inflammation, provided the extract is of high quality and used at an efficacious concentration.
Extremely positive. It is viewed as a safe, effective, and natural alternative to synthetic brightening agents like hydroquinone, with a long history of use in traditional medicine appealing to the 'ancient wisdom' narrative.