Ingredient guide
Kojic Acid
KOJIC ACID
In short
Kojic Acid (also known as kojic acid) is a skincare active generally associated with tone and pigmentation. It is backed by a moderate body of published research. It is often chosen for combination and oily skin. MIRU describes it by what is visible on skin — never as a treatment or cure.
Reviewed against published evidence · editorially independent · no brand pays for placement
Works for
Tone
Skin type
Combination · Oily
Best used
Evening
What it is
Fungal-derived tyrosinase inhibitor produced by Aspergillus fermentation. Chelates the copper at the active site of tyrosinase, halting melanin production. Well-established brightening agent at 1-4%; often combined with glycolic acid and hydroquinone in triple-combination formulations. Primary concern is contact sensitisation in a subset of users, particularly at concentrations above 2%; contact dermatitis documented in clinical literature.
When to use it
Evenings are the common choice.
A few times a week to start — it can be sensitising at first.
On the label
Usually 1–2% on labels
Kept modest for stability and comfort.
Pairs well with
Where it sits
Serums sit after toner and before moisturiser — thinnest to thickest, water before oil.
- Cleanse
- Tone
- Kojic Acid
- Moisturise
- SPF
Also found as
Related
Where to find it
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Search the Lens for kojic acidCommon questions
What does Kojic Acid do for skin?
Kojic Acid is associated in published research with tone and pigmentation. Fungal-derived tyrosinase inhibitor produced by Aspergillus fermentation. Chelates the copper at the active site of tyrosinase, halting melanin production. Well-established brightening agent at 1-4%; often combined with glycolic acid and hydroquinone in triple-combination formulations. Primary concern is contact sensitisation in a subset of users, particularly at concentrations above 2%; contact dermatitis documented in clinical literature. MIRU frames ingredients by what is visible, not by medical claims.
When should I use Kojic Acid?
Kojic Acid is typically used in the evening. Introduce any new active on its own first and add one product at a time so you can see how your skin responds.
Is Kojic Acid suitable for my skin type?
Kojic Acid is often chosen for combination and oily skin. It can be used with care — if your skin is reactive, patch-test first and watch for any irritation.
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Personal guidance only · For clinical concerns, see a dermatologist.