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Licorice root extract and kojic acid both appear in pigment-focused skincare, but their evidence and formulation questions differ. Licorice is a mixture whose relevant compounds may be unspecified. Kojic acid is a particular molecule. Neither ingredient name establishes a universal dark-spot winner or guarantees tolerance.
A Glycyrrhiza root extract can contain different compounds depending on its species and preparation. Glabridin is one studied pigment-related constituent; it is not synonymous with every licorice extract. Kojic acid has a distinct chemical identity and its own tyrosinase-related research.
Kojic acid and kojic dipalmitate are also different materials. If a comparison cites kojic acid research, check that the formula actually names that ingredient. The kojic acid guide covers the ingredient and its derivatives.
| Evidence question | Licorice side | Kojic acid side |
|---|---|---|
| Laboratory rationale | Named licorice compounds have pigment-pathway experiments | Tyrosinase-related laboratory work supports research interest |
| Human pigmentation research | Small studies of specified compounds such as liquiritin | Trials include kojic acid in particular combined preparations |
| Important limit | A generic extract is not the studied compound | Combination outcomes do not prove the isolated molecule’s full contribution |
| Head-to-head conclusion | These separate studies do not rank the two ingredients | A relevant direct comparison would be needed |
For example, Lim’s 1999 split-face melasma trial assessed adding kojic acid to a gel that already contained hydroquinone and glycolic acid. It is not a licorice-versus-kojic trial and does not certify an ordinary kojic soap or a different cream.
No whole-formula guarantee follows from botanical origin. Licorice extracts can cause contact allergy; a kojic product may also be irritating or unsuitable for an individual. Acids, fragrance, the vehicle and frequency can change tolerance substantially. Comparing two actual formulas is more useful than ranking “natural” against a chemical name.
If irritation develops, stop the new product rather than adding more soothing layers. The licorice reaction guide addresses known allergy and new-product testing.
A combined brightening product may contain licorice and kojic acid, but that is not evidence of synergy. Adding separate products can also duplicate accompanying exfoliants or other actives. Kojic acid compatibility guidance helps assess those overlaps.
Use licorice selection guidance or kojic acid selection guidance for the respective formulation questions. Diagnosed melasma and changing spots deserve medical assessment rather than an escalating cosmetic stack.
By Herbal Dynamics Beauty · Reviewed October 6, 2026.
