Acetic Acid
INCI: ACETIC ACID
A weak acid with antimicrobial properties, commonly used to balance pH in skincare formulations
Best For Skin Types
All, Oily, Combination, Acne-prone
Addresses
Usage Frequency
Daily
What Is Acetic Acid?
Acetic acid is a simple organic acid found naturally in vinegar and fermented products. In skincare, it serves primarily as a pH buffer and preservative agent rather than an active treatment ingredient. It works by adjusting the acidity level of formulations to keep them stable and effective.
The ingredient has a long history of folk use in traditional remedies, though its role in modern skincare is more functional than therapeutic. When used in cosmetic products, concentrations are typically very low and carefully controlled.
How It Works
Acetic acid functions as a buffer, meaning it helps resist changes in pH when other ingredients are added to a formula. This keeps the product at a level that suits skin application. Its antimicrobial properties come from its ability to create an environment where certain bacteria and fungi find it difficult to survive, though this effect is more significant in preservation contexts than in typical topical skincare use.
Clinical Evidence & References
Research indicates that acetic acid (vinegar) has demonstrated antimicrobial and antioxidant properties in controlled settings, with evidence supporting use in wound care and certain fungal or bacterial skin concerns. However, most skincare formulations contain acetic acid at very low concentrations primarily for buffering and preservation purposes, not for direct therapeutic effect.
The evidence base for acetic acid as an active skincare treatment ingredient is limited. Any benefits are largely attributed to its pH-adjusting and antimicrobial functions rather than transformative skincare activity. Misuse or excessive exposure to concentrated acetic acid can irritate skin, so appropriate formulation and concentration are important.
How to Use
Acetic acid in skincare products is used at controlled, safe levels by formulators. If using products containing this ingredient, follow standard application instructions. There is no need for special handling. If you have particularly sensitive or reactive skin, patch test new products as you would with any skincare formulation.
Safety & Precautions
How widely it's used
Regulatory information
Standardised cosmetic-ingredient identifiers used by regulators.
Show identifiers
- INCI Name
- ACETIC ACID
- INN Name
- acetic acid
- EC Number
- 200-580-7
- Pharmacopoeia Name
- acidum aceticum
- Function
- Buffering, Masking
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