Mandelic Acid

Mandelic acid is 杏仁酸 (xìng rén suān) in Chinese — the same name is used in Taiwan — and it's sometimes called 苦杏仁酸. It's the gentlest of the common AHAs: a large, slow-penetrating molecule that exfoliates dead cells and clears pores with minimal irritation.

Mandelic acid's molecule is bigger (152 Da vs 106 Da), so it penetrates slowly and gently — better for sensitive skin. Glycolic absorbs fast and hits harder, suiting thicker, resilient skin. Sensitive-skin beginners should start with mandelic, then try glycolic once tolerance builds.

Most people notice smoother, brighter texture within 2–4 weeks. Pore improvement usually takes 6–8 weeks, and fading dark marks takes 3+ months. Frequency, concentration, and your skin's condition all affect the timeline.

No. It only removes dead surface cells and doesn't harm living ones; consistent use actually speeds renewal and leaves the stratum corneum healthier and more even. The key is a reasonable dose and gradual ramp-up — don't jump straight to high concentrations.

Start at 5–8%, once or twice a week, and increase frequency only as skin adapts. Very sensitive skin should test first on tolerant spots like the cheekbones or chin. Persistent stinging or redness means stop immediately.

You can, but it's not recommended. It raises skin sensitivity and sun-reaction risk, so daytime use demands SPF 30+. Nighttime use is safer and more effective, giving skin time to fully recover.