4-HYDROXYBENZOIC ACID

EU max concentration: 0,4% (as acid) for single ester 0,8% (as acid) for mixtures of esters

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

4-hydroxybenzoic acid is an aromatic organic compound with an important role in your cells’ energy production. Here’s what the research actually shows:

#1: How it relates to cellular energy. Your cells contain mitochondria—tiny structures that produce energy using coenzyme Q (CoQ). Your body normally makes coenzyme Q from a starting material called 4-hydroxybenzoic acid. In a 2024 study published in Cell Reports, researchers found that when animals had defects preventing normal coenzyme Q production, giving them 4-HBA supplementation triggered their cells to make more coenzyme Q naturally. Remarkably, this approach outperformed direct coenzyme Q10 supplementation in restoring normal mitochondrial function and addressing serious health issues like heart problems and developmental delays.

The same researchers confirmed this worked in human skin cells from patients with genetic variants affecting coenzyme Q production, suggesting the approach could translate to real-world use. #2: Antimicrobial properties. A 2015 study in the Journal of Clinical Pharmacy and Therapeutics examined antimicrobial activity of 4-HBA and related compounds. The research found that 4-HBA and its derivatives showed antimicrobial effects against bacteria (Staphylococcus aureus, Escherichia coli) and fungi (Saccharomyces cerevisiae, Fusarium culmorum). A 2020 study in the Journal of Agricultural and Food Chemistry notes that hydroxybenzoic acids including 4-HBA are known to have “antibacterial, anticancer, antidiabetic, antiaging, antiviral, and anti-inflammatory activities,” though this source lists these as known properties without providing detailed evidence for skincare specifically.

#3: Industrial applications. A 2018 review in Applied Microbiology and Biotechnology describes 4-HBA as “a promising intermediate” for cosmetic, pharmaceutical, and food applications, confirming its established use in these industries. Important limitation: The most compelling evidence (Cell Reports, 2024) focuses on genetic deficiency diseases and used cell cultures from patients—not on 4-HBA as a cosmetic ingredient for general skin health. Claims about antiaging or anti-inflammatory effects in cosmetic products are mentioned in one source but lack detailed supporting data specific to topical skincare use.

💧 Skin Type Compatibility

⚠️ Don’t Combine With

🧴 Products Containing 4-HYDROXYBENZOIC ACID

📄 Related Research

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

• Corral-Sarasa J et al. (2024). 4-Hydroxybenzoic acid rescues multisystemic disease and perinatal lethality in a mouse model of mitochondrial disease. Cell Rep.
• Wang S et al. (2018). 4-Hydroxybenzoic acid-a versatile platform intermediate for value-added compounds. Appl Microbiol Biotechnol.
• Kim H et al. (2020). Synthesis of 4-Hydroxybenzoic Acid Derivatives in Escherichia coli. J Agric Food Chem.
• Tsagogiannis E et al. (2024). Elucidation of 4-Hydroxybenzoic Acid Catabolic Pathways in Pseudarthrobacter phenanthrenivorans Sphe3. Int J Mol Sci.
• Kosová M et al. (2015). Antimicrobial effect of 4-hydroxybenzoic acid ester with glycerol. J Clin Pharm Ther.