MANDELIC ACID

Description: MANDELIC ACID — AHA exfoliant, gentler than glycolic acid, mild antibacterial.

All Functions: AHA exfoliant, gentler than glycolic acid, mild antibacterial

Quick Facts:

• Category: active

Proven Benefits At A Glance:

• Mandelic acid is an alpha-hydroxy acid (a type of chemical exfoliant) studied for acne and hyperpigmentation
• Research shows it may improve skin elasticity and firmness when used topically over 4 weeks
• It has antimicrobial properties and can be formulated into skincare products
• When combined with tranexamic acid, it may enhance skin penetration and pigmentation reduction
• In direct comparison with lactic acid for dark circles, lactic acid showed superior results in one study

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🧪 MANDELIC ACID

MANDELIC ACID

CAS Number: 90-64-2

Also Known As: —

Category: active

EC Number: 202-007-6

Korean Name: 만델릭애씨드

Benzeneacetic acid, .alpha.-hydroxy-

MANDELIC ACID is an active ingredient used in skincare formulations.

🌍 Regulatory Status

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

Mandelic acid is an alpha-hydroxy acid (AHA)—a type of chemical exfoliant that works on the skin’s surface. Here’s what the research actually shows:

#1: Skin elasticity and firmness improvements. In a 4-week study published in Facial Plast Surg (2018), 24 patients aged 42–68 applied mandelic acid topically twice daily to their faces. Researchers measured lower eyelid skin using a device called the Cutometer, which objectively measures skin mechanical properties. Results showed elasticity increased by 25.4% and skin firmness increased by 23.8%, with statistical significance noted. These improvements in physical skin properties correlated with improved photographic appearance. #2: Pigmentation reduction when paired with other ingredients.

A 2025 study in Skin Res Technol examined mandelic acid combined with tranexamic acid (TXA) as an ion-pair complex. This combination showed enhanced skin permeability compared to tranexamic acid alone and greater suppression of inflammation-related genes (IL-1α, IL-6, IL-8, COX-2) in cell models. A 4-week human study using 3D imaging found the combination significantly reduced visible skin pigmentation more effectively than tranexamic acid by itself. #3: Antimicrobial and preservative properties. Research in Molecules (2024) and Int J Mol Sci (2023) found that mandelic acid has antimicrobial activity against bacteria and yeasts. When formulated into emulsions and gels with essential oils, mandelic acid contributed to antimicrobial effectiveness and improved product stability.

One study (Int J Mol Sci, 2023) noted that mandelic acid in antimicrobial gels performed comparably to or better than commercial ethanol-based hand sanitizers in both antimicrobial activity and skin tolerability. #4: Performance versus lactic acid. A 2025 study in Indian Dermatol Online J directly compared 30% mandelic acid peels with 30% lactic acid peels for treating periorbital melanosis (dark circles) over 6 weeks. Both acids improved pigmentation, but lactic acid showed significantly greater reduction (50% of patients achieved more than 30% improvement versus a lower rate in the mandelic acid group, P = 0.001). Patient satisfaction was also higher with lactic acid (100% versus 83.9%), and lactic acid caused milder side effects.

The mandelic acid group experienced more irritation, while the lactic acid group had more exfoliation. The study authors noted their sample size was small and duration short, limiting broader conclusions. Important limitation: The sources are limited and don’t fully agree on mandelic acid’s superiority. It appears effective for certain uses, but direct comparisons suggest lactic acid may outperform it for some applications, particularly pigmentation reduction.

💧 Skin Type Compatibility

Derived from this ingredient’s irritancy potential and comedogenicity rating against the needs of each skin type — e.g. oily and acne-prone skin are marked down for pore-clogging ingredients, sensitive skin for irritants. A starting heuristic, not a dermatological verdict.

⚠️ Don’t Combine With

🧴 Products Containing MANDELIC ACID

• Tula TULA bedtime bright
• Lumē Whole Body Deodorant
• Lumē Whole Body Deodorant
• Lume Whole Body Deodorant
• lume deodorant
• Coop Sapone liquido delicato
• Ziaja Manuka Tree – Tónico Facial Astringente
• Peter Thomas Roth Anti-Aging Cleansing Oil Makeup Remover
• Lumē Whole Body Deodorant
• Paula’s Choice Skin Perfecting 6% Mandelic Acid + 2% Lactic Acid Liquid Exfoliant

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Jeon H et al. (2025). Enhanced Skin Permeation and Pigmentation Reduction Effects of a Novel Tranexamic Acid-Mandelic Acid Ion-Pairing Complex. Skin Res Technol.
• Pavlačková J et al. (2024). Formulating Sustainable Emulsions: Mandelic Acid and Essential Oils as Natural Preservatives. Molecules.
• Egner P et al. (2023). Non-Alcohol Hand Sanitiser Gels with Mandelic Acid and Essential Oils. Int J Mol Sci.
• Jacobs SW et al. (2018). Effects of Topical Mandelic Acid Treatment on Facial Skin Viscoelasticity. Facial Plast Surg.
• Malviya A et al. (2025). A Prospective Study Comparing Clinical Efficacy of 30% Mandelic Acid Peel Versus 30% Lactic Acid Peel in Periorbital Melanosis. Indian Dermatol Online J.