3-HYDROXYBENZOIC ACID

Description: 3-HYDROXYBENZOIC ACID — SKIN CONDITIONING.

All Functions: SKIN CONDITIONING

Quick Facts:

• Category: emollient

Proven Benefits At A Glance:

• 3-hydroxybenzoic acid (3-HBA) is an aromatic compound that can be produced from renewable resources like glucose and glycerol using engineered microbes
• Research shows 3-HBA may disrupt bacterial biofilm formation in lab studies
• 3-HBA is a precursor chemical for industrial materials, not yet established as a skincare ingredient
• Current research focuses on microbial production methods and antimicrobial properties—human skin safety data is extremely limited

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.

🧪 3-HYDROXYBENZOIC ACID

3-HYDROXYBENZOIC ACID

CAS Number: 99-06-9

Also Known As: —

Category: emollient

EC Number: 202-726-5

Korean Name: 3-하이드록시벤조익애씨드

Benzoic Acid, 3- Hydroxy-

3-HYDROXYBENZOIC ACID is an emollient ingredient used in skincare formulations.

🌍 Regulatory Status

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

3-hydroxybenzoic acid (3-HBA) is an aromatic organic compound being studied primarily for industrial and antimicrobial applications rather than skincare. Here’s what the available research actually shows:

#1: Production and sourcing—Scientists are developing sustainable ways to manufacture 3-HBA from renewable feedstocks. One study (Eng Life Sci, 2019) demonstrated that engineered E. coli bacteria can convert glycerol into 3-HBA using a co-culture system, achieving a 5.3-fold improvement in production efficiency compared to single-strain cultures. Another approach (Microb Cell Fact, 2023) uses Corynebacterium glutamicum to produce related compounds from glucose. These are biotechnology achievements focused on replacing petroleum-based production. #2: Antimicrobial activity in controlled settings—The most skin-relevant finding comes from a 2025 study (Eur J Clin Microbiol Infect Dis) examining 3-HBA against Acinetobacter baumannii, a problematic antibiotic-resistant bacterium.

At a concentration of 0.078 mg/mL, 3-HBA reduced biofilm formation by roughly 60% in lab cultures and decreased bacterial biofilm material production by 58–64%. However, this research was conducted in test tubes and petri dishes, not on human skin. Importantly, the same study found that 3-HBA reduced viability of human cancer cells (MCF-7) by 43.67% at that same concentration, raising serious questions about safety for topical use on healthy skin. #3: Limited human or skin safety data—None of the sources provide evidence that 3-HBA is safe for application to human skin, effective for any skincare concern, or suitable for cosmetic use.

The research is purely mechanistic and microbial. The bottom line: 3-HBA is an interesting industrial and research chemical, but there is no skincare science behind it yet.

💧 Skin Type Compatibility

⚠️ Don’t Combine With

🧴 Products Containing 3-HYDROXYBENZOIC ACID

📄 Related Research

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

• Nonaka K et al. (2023). A 4-hydroxybenzoate 3-hydroxylase mutant enables 4-amino-3-hydroxybenzoic acid production from glucose in Corynebacterium glutamicum. Microb Cell Fact.
• Zhou Y et al. (2019). Establishing microbial co-cultures for 3-hydroxybenzoic acid biosynthesis on glycerol. Eng Life Sci.
• Kuwabara K et al. (2026). Unprecedented Nitrite-Dependent Aromatic Amination to Synthesize 2,4-Diamino-3-Hydroxybenzoic Acid. Chembiochem.
• Pathoor NN et al. (2025). 3-Hydroxybenzoic acid inhibits the virulence attributes and disrupts biofilm production in clinical isolates of Acinetobacter baumannii. Eur J Clin Microbiol Infect Dis.