The INKEY List Mandelic Acid Treatment 10% Serum 0.5 fl oz — gentle brightening with 0.1% retinol and glycerin

The INKEY List Mandelic Acid Treatment is a lightweight 10% mandelic acid serum with 0.1% retinol and glycerin formulated to target post-acne marks, hyperpigmentation, and uneven tone.

This focused treatment combines a high‑concentration mandelic acid — an AHA derived from bitter almonds — with a small amount of retinol and humectant glycerin to gently encourage cell turnover while maintaining hydration. The larger molecular size of mandelic acid makes it milder than some other exfoliating acids, making this formula an option for those who want effective brightening without aggressive irritation. It’s fragrance‑free, cruelty‑free, and presented in a compact 0.5 fl oz bottle aimed for evening use as part of a targeted skincare step.

How does this treatment address dark spots and post‑acne marks?

The 10% mandelic acid works by promoting gradual exfoliation of the top skin layers, helping pigment to fade over time. Paired with 0.1% retinol, the formula supports natural cell renewal to reduce the appearance of discoloration. Regular evening use on affected areas helps even skin tone while glycerin prevents dryness.

• 10% mandelic acid to encourage surface exfoliation
• 0.1% retinol to aid natural cell turnover
• Glycerin to restore and retain moisture during treatment

Is this suitable for sensitive or acne‑prone skin?

Mandelic acid has a larger molecular structure than many AHAs, which generally means a slower, less penetrating action and a lower risk of irritation. That makes this treatment a reasonable option for those with sensitivity, while the retinol content is deliberately low to keep irritation minimal. Patch testing and gradual introduction are still recommended for reactive skin.

• Gentler AHA profile for reduced sting or redness
• Low retinol percentage to limit sensitivity
• Fragrance‑free formula suitable for acne‑prone types

How should I add it to my evening routine for best results?

Use this mandelic acid treatment in the PM as the final step on cleansed skin. Apply a thin layer to areas of discoloration and follow with any leave‑on moisturizers; avoid layering with strong actives the same night to minimize irritation. Always use SPF during daytime while using acid and retinol treatments.

• Apply on clean, dry skin at night
• Pat a thin layer onto target spots, then seal with moisturizer
• Use daily sun protection while treating hyperpigmentation

What results can I expect and how long until I notice them?

Results depend on the depth and age of the pigmentation; many users notice gradual softening of dark marks within several weeks, with clearer improvement over 8–12 weeks of consistent use. This product focuses on fading post‑inflammatory hyperpigmentation and improving overall tone without aggressive peeling.

• Gradual improvement often visible in weeks
• Best outcomes with consistent nightly use and SPF
• Suitable for long‑term maintenance of even tone

Who this is for: This formula is designed for anyone dealing with post‑acne marks, melasma‑type discoloration, or uneven skin tone who prefers a gentler AHA approach. It’s a practical choice for those with sensitive or acne‑prone skin who want an accessible, cruelty‑free treatment to encourage steady fading of dark spots while keeping skin hydrated.