The gentlest AHA in The Ordinary's range — larger molecular weight means shallower skin penetration and less sting. Good for sensitive skin dipping into chemical exfoliation for the first time.
What this is good for
✓ Great forRough Texturesensitive
• Use with caution ifDamaged barrier
Ingredient stack
Each ingredient is listed in descending concentration. Above the 1% line the order is regulated — below it, brands can list in any order.
Ingredients above the dashed gold line are dosed above 1% (the regulatory threshold) — these are what the formulation is really built on.
position-estimated %★ brand-disclosed %1% regulatory line
What's actually doing the work
Mandelic Acid
AHA (almond-derived) / 152 Dalton AHA
Acid
The largest commonly used AHA — 152 daltons — giving the slowest and most superficial penetration. The safest AHA for darker skin tones (Fitzpatrick IV–VI) as its slower action minimises PIH risk. Additional antimicrobial properties make it beneficial for acne-prone skin. Ideal for those needing gentle exfoliation without risk.
Routine placement
Evening only
Similar on the shelf
Put this in context
Skin Stacker is independent and receives no payment from any brand. Ingredient analysis is based on publicly disclosed INCI lists and the peer-reviewed literature. Formulations change — always re-check the label on your specific batch before using.