Acetic acid in food: ingestion safety
Moderate riskOral ingestion of acetic acid ranges from the entirely benign (daily dietary vinegar consumption) to potentially harmful (ingestion of glacial acetic acid) based on concentration — the dose-response relationship is sharply concentration-dependent. Dietary exposure: household vinegar (5% acetic acid, pH ~2.4) is consumed globally as a condiment and food preservative; typical daily intake ranges from trace amounts to 10–30 mL (salad dressings, pickling) — entirely safe at these levels. Apple cider vinegar trends: concentrated ACV supplements (6% acetic acid) taken daily for purported health benefits (weight loss, glycemic control) — while epidemiological interest exists, erosive esophagitis and dental enamel erosion have been documented with chronic high-volume ACV ingestion. Glacial acetic acid ingestion: concentrated acetic acid ingestion causes severe corrosive GI injury — oropharyngeal and esophageal burns, gastric hemorrhage; this is an emergency scenario requiring immediate medical care. Metabolic processing: absorbed acetate enters the citric acid cycle, is converted to acetyl-CoA, and metabolized via normal lipid/carbohydrate oxidation — complete, efficient metabolism. Therapeutic applications: acetic acid-based oral rehydration solutions have been investigated; acetic acid (as acetate) is a component of IV Lactated Ringer's and PlasmaLyte solutions — demonstrates biological compatibility at controlled doses. Intentional self-harm: acetic acid and vinegar are occasionally ingested in self-harm contexts (more commonly in developing countries where availability of concentrated acetic acid as a cleaning agent is higher than in developed countries) — concentrated (>20%) causes significant morbidity.
What is acetic acid?
Also known as: ethanoic acid, Vinegar acid, Acetic acid glacial, Ethylic acid.
- IUPAC name
- acetic acid
- CAS number
- 64-19-7
- Molecular formula
- C2H4O2
- Molecular weight
- 60.05 g/mol
- SMILES
- CC(=O)O
- PubChem CID
- 176
Risk for people
Moderate riskOral ingestion of acetic acid ranges from the entirely benign (daily dietary vinegar consumption) to potentially harmful (ingestion of glacial acetic acid) based on concentration — the dose-response relationship is sharply concentration-dependent. Dietary exposure: household vinegar (5% acetic acid, pH ~2.4) is consumed globally as a condiment and food preservative; typical daily intake ranges from trace amounts to 10–30 mL (salad dressings, pickling) — entirely safe at these levels. Apple cider vinegar trends: concentrated ACV supplements (6% acetic acid) taken daily for purported health benefits (weight loss, glycemic control) — while epidemiological interest exists, erosive esophagitis and dental enamel erosion have been documented with chronic high-volume ACV ingestion. Glacial acetic acid ingestion: concentrated acetic acid ingestion causes severe corrosive GI injury — oropharyngeal and esophageal burns, gastric hemorrhage; this is an emergency scenario requiring immediate medical care. Metabolic processing: absorbed acetate enters the citric acid cycle, is converted to acetyl-CoA, and metabolized via normal lipid/carbohydrate oxidation — complete, efficient metabolism. Therapeutic applications: acetic acid-based oral rehydration solutions have been investigated; acetic acid (as acetate) is a component of IV Lactated Ringer's and PlasmaLyte solutions — demonstrates biological compatibility at controlled doses. Intentional self-harm: acetic acid and vinegar are occasionally ingested in self-harm contexts (more commonly in developing countries where availability of concentrated acetic acid as a cleaning agent is higher than in developed countries) — concentrated (>20%) causes significant morbidity.
Regulatory consensus
3 regulatory and scientific bodies have classified Acetic acid. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| OSHA | — | Occupational exposure limit | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 5 positive / 6 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 5 positive / 6 negative reports) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where you encounter acetic acid
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
- Food — processed food, beverages, candy, baked goods
-
Fragrance
— perfume, cologne, scented personal care products, household fragrance products, candles
Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Acetic acid:
-
Physical/mechanical pest control (IPM)
Trade-offs: More labor-intensive. May not be sufficient for severe infestations.Relative cost: 1.2-2×
Frequently asked questions
Is acetic acid safe for you?
Oral ingestion of acetic acid ranges from the entirely benign (daily dietary vinegar consumption) to potentially harmful (ingestion of glacial acetic acid) based on concentration — the dose-response relationship is sharply concentration-dependent. Dietary exposure: household vinegar (5% acetic acid, pH ~2.4) is consumed globally as a condiment and food preservative; typical daily intake ranges from trace amounts to 10–30 mL (salad dressings, pickling) — entirely safe at these levels. Apple cider vinegar trends: concentrated ACV supplements (6% acetic acid) taken daily for purported health benefits (weight loss, glycemic control) — while epidemiological interest exists, erosive esophagitis and dental enamel erosion have been documented with chronic high-volume ACV ingestion. Glacial acetic acid ingestion: concentrated acetic acid ingestion causes severe corrosive GI injury — oropharyngeal and esophageal burns, gastric hemorrhage; this is an emergency scenario requiring immediate medical care. Metabolic processing: absorbed acetate enters the citric acid cycle, is converted to acetyl-CoA, and metabolized via normal lipid/carbohydrate oxidation — complete, efficient metabolism. Therapeutic applications: acetic acid-based oral rehydration solutions have been investigated; acetic acid (as acetate) is a component of IV Lactated Ringer's and PlasmaLyte solutions — demonstrates biological compatibility at controlled doses. Intentional self-harm: acetic acid and vinegar are occasionally ingested in self-harm contexts (more commonly in developing countries where availability of concentrated acetic acid as a cleaning agent is higher than in developed countries) — concentrated (>20%) causes significant morbidity.
What products contain acetic acid?
Acetic acid appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); processed food (Food).
Why do regulators disagree about acetic acid?
Acetic acid has been classified by 3 agencies including OSHA, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.
See Acetic acid in the food app
Look up products containing acetic acid, compare to alternatives, and explore the full data record.
Open in food View raw API dataSources (2)
- NIOSH Pocket Guide: Acetic Acid — IDLH 50 ppm; PEL 10 ppm; glacial acetic acid burns; flammable liquid; industrial uses; corrosive concentrations; occupational monitoring (2019) (2019) — regulatory
- FDA GRAS: Acetic Acid and Vinegar — GRAS food additive; pickling; preservation; ACV supplement concerns; esophagitis; otic solution clinical use; biological metabolite (2021) (2021) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →