Ingredient guide
Dioic Acid
INCI name · dioic acid
In short
Dioic acid is a long-chain dicarboxylic acid used to improve the look of uneven tone and visible oiliness. Studies show it can gradually refine pigmentation and surface shine.
What it is
C18 alpha-omega dicarboxylic acid acting as a PPAR-gamma modulator; clinical studies report incremental improvement in surface pigmentation and seborrhoea over 8-12 weeks at 2% in leave-on systems; distinct from azelaic acid in chain length and mechanism.
Evidence receipt
No linked study yet
No verified study is linked to this exact ingredient and route. The guidance below describes conventional use; it is not evidence of efficacy.
When to use it
Mornings suit it best.
Where it sits
Serums sit after toner and before moisturiser. Thinnest to thickest, water before oil.
- Cleanse
- Tone
- Dioic Acid
- Moisturise
- SPF
Also found as
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Common questions
What does dioic acid do for skin?
It helps reduce the look of uneven pigmentation and can minimise visible oil buildup, giving a more balanced appearance.
Is dioic acid good for oily or combination skin?
Yes, it’s often chosen for its ability to reduce visible shine and refine the look of pores.
How is dioic acid used in routines?
It usually appears in leave-on serums for tone and clarity. You use it as you would any targeted brightening step.
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Personal guidance, not medical advice.