What are the side effects of eating acetic acid?

The Dangers of Ingesting Acetic Acid

While vinegar—a diluted form of acetic acid—is common in kitchens and generally safe in small amounts, ingesting concentrated acetic acid is an entirely different story. The pure, glacial form of acetic acid is highly corrosive and extremely dangerous if swallowed.

Even a small amount can cause severe chemical burns to the mouth, throat, esophagus, and stomach. These burns often result in intense pain, difficulty swallowing, and persistent vomiting—sometimes with blood. In serious cases, the damage can lead to perforation of the digestive tract, a life-threatening condition requiring immediate medical intervention.

They are not the same. Glacial acetic acid is an industrial-strength chemical used in laboratories and manufacturing, not for human consumption. There is no safe level of intake for the concentrated form.

Accidental ingestion, though rare, can happen due to improper storage or labeling. If exposure occurs, it’s critical to seek emergency medical help immediately. Do not induce vomiting unless instructed by a professional—doing so could worsen tissue damage.

While acetic acid in household vinegar is harmless in food-grade concentrations (typically 4–8%), the glacial form (99% or higher concentration) poses a severe poisoning risk. Symptoms can appear within seconds, and long-term complications—like scarring of the esophagus—may persist even after initial recovery.

The bottom line: keep concentrated acetic acid securely stored, clearly labeled, and far away from food or drink containers. In chemistry and cleaning, it has important uses—but in the human body, it has no place. Safety starts with awareness.