Azelaic Acid vs. Licorice Root: Which One Actually Fades Dark Spots?

Both of these get recommended for fading dark spots, and both work through a related enzyme-blocking mechanism. The honest difference between them is less about mechanism and more about how much real clinical evidence actually backs each one up.

Azelaic acid has the deeper evidence base

Azelaic acid has been studied clinically for decades, including direct trial comparisons against hydroquinone, long considered one of the strongest pigmentation treatments available. See what azelaic acid does for the fuller picture on that research history.

That depth of clinical evidence is a real, meaningful difference, not a minor detail.

Licorice root’s evidence is real but thinner

Licorice root’s brightening compounds, glabridin and liquiritin, have a plausible, documented mechanism, inhibiting tyrosinase and helping disperse existing melanin. See what licorice root extract does for how that mechanism actually works.

But a chemist-authored source reviewing brightening ingredients specifically notes that human clinical data for licorice root is thinner than for more established options, an honest admission most product marketing skips entirely.

Why this distinction matters for your expectations

Azelaic acid’s stronger evidence base means you can expect more predictable, more thoroughly documented results, since real trials have measured its effect specifically and repeatedly.

Licorice root likely does something genuinely useful, given its documented mechanism, but the confidence level around exactly how much and how reliably is lower simply because fewer rigorous human trials exist.

What the adjustment period looks like

Licorice root is generally gentler, with a lower irritation profile than azelaic acid, which carries a real, if usually mild, adjustment period involving tingling or dryness in the first couple of weeks.

If you’ve found azelaic acid too intense, licorice root offers a plausible, gentler alternative, with the caveat that its effectiveness isn’t backed by the same volume of clinical confirmation.

Does azelaic acid do anything licorice root doesn’t

Yes. Azelaic acid has real antibacterial and anti-inflammatory properties giving it documented use for acne and rosacea, well beyond pigmentation alone. Licorice root’s anti-inflammatory action is real but hasn’t been studied as extensively for those same specific conditions.

Hedging between the two

Yes, and there’s no established conflict between them. Combining a well-evidenced option with a gentler, plausibly effective one is a reasonable way to hedge between confidence and comfort.

Weighing proof against comfort

If you want the ingredient with the deepest, most reliable clinical trial history, and your skin tolerates a mild adjustment period, azelaic acid is the more evidence-backed choice.

If you want a gentler option and are comfortable with a plausible, if less rigorously proven, mechanism, licorice root is a reasonable, lower-risk starting point.

Frequently asked questions

Is licorice root safe to use during pregnancy? Topical use is generally considered lower risk than oral licorice consumption, which does carry real, documented systemic considerations. Still, mentioning any active skincare ingredient to your doctor during pregnancy is a reasonable, low-effort precaution.

How long before I’d see results from either one? Both work gradually. Azelaic acid’s more studied timelines suggest visible improvement over eight to twelve weeks. Licorice root likely follows a similar general pace, though with less precise data pinning down an exact timeline.

Does azelaic acid work for melasma specifically better than licorice root? Azelaic acid has more direct trial data for melasma specifically, including comparisons to established treatments. Licorice root may help but hasn’t been studied as rigorously for this particular, more stubborn type of pigmentation.

Which one is gentler for sensitive, reactive skin? Licorice root is generally the gentler option of the two, making it a reasonable starting point if you have reactive skin or have struggled with azelaic acid’s adjustment period before.

Can I combine both with vitamin C in the same routine? Yes, and this is a reasonable combination given none of the three conflict mechanically. See vitamin C vs. licorice root for how that specific pairing compares if you’re deciding between them rather than combining all three.

Where to actually find these

Both ingredients appear across a range of serums and creams at varying concentrations. If you want to compare current azelaic acid and licorice root brightening products side by side, browse azelaic acid and licorice root brightening serums on Amazon to see real formulas before choosing.

As an Amazon Associate, this site may earn from qualifying purchases made through links like the one above, at no extra cost to you.

Depth of evidence versus gentleness

Azelaic acid has the deeper, more rigorous clinical trial history, including direct comparisons to established pigmentation treatments. Licorice root has a real, plausible mechanism, but the human clinical evidence supporting it is genuinely thinner.

Neither means licorice root doesn’t work. It means the confidence level differs, which is worth knowing honestly rather than assuming every brightening ingredient has equally solid proof behind it.