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Vinegar Polyphenol Extract Eases Alcohol Liver Injury In Mice

A compound from traditional brewed vinegar restored gut bacteria and protected the liver in alcohol-fed mice, a new study found.

By Dr. Axe Editorial Team · October 24, 2026 · 1 source · Watch

A vinegar-derived polyphenol extract eased alcohol-related liver injury in mice by calming a key liver stress pathway and restoring the community of microbes living in the gut, published October 19, 2026 in Food & Function.

750mg/kg dose tested

20phenolic compounds found

Researchers identified 20 phenolic compounds in a vinegar polyphenol extract, with 4-hydroxybenzoic acid making up 46.67% of the mix. In alcohol-treated male mice, dosing the extract at 750 mg per kilogram of body weight significantly reduced blood markers of liver damage, ALT and AST, alongside lower oxidative stress and inflammation in the liver. The extract also reduced alcohol-triggered activation of three liver stress proteins, p38, JNK, and ERK1/2, part of what researchers call the MAPK signaling pathway, a chain of proteins liver cells use to respond to damage. Gut effects included a restored intestinal barrier, often called gut lining integrity, lower circulating endotoxin (LPS) burden, and a remodeled gut microbe mix, with more Akkermansia and Bacteroides and less Escherichia. Short-chain fatty acids, byproducts gut bacteria make from fiber, including acetic acid and propionic acid, were also restored.

When researchers depleted the gut microbiota with antibiotics, the extract's liver-protective effects weakened. Transferring fecal microbes from treated mice back into other mice restored the protection, which the authors say indicates the liver benefit depends on gut bacteria changes.

Short-chain fatty acids help maintain the gut lining and dial down inflammation signals that travel to the liver; when alcohol disrupts gut bacteria and raises endotoxin leaking into the bloodstream, the liver absorbs the brunt of that inflammatory load. The fecal transplant result supports the authors' conclusion that restoring gut bacteria, not just scavenging toxins in the liver directly, drove the protective effect.

Vinegar Polyphenol Extract Dose Tested

Food & Function, 2026, Liu et al.

This was conducted in male mice only using a concentrated extract at a specific research dose, not table vinegar at typical culinary amounts; whether these effects translate to human alcohol use or apply to female physiology remains unknown.

Dr. Axe’s Take

This is a mouse study of a concentrated vinegar extract, not a reason to add a vinegar shot to your drinking habit. What it confirms is the gut-liver connection: short-chain fatty acids like acetic and propionic acid sit at the center of how gut bacteria protect the liver from alcohol's damage. For anyone concerned about alcohol's effect on the liver, the practical lever is feeding the gut microbes that make those short-chain fatty acids, through fiber-rich vegetables, fermented foods, and cutting back on alcohol itself. I would build that gut foundation daily rather than count on a concentrated extract to undo damage after the fact.

— Dr. Axe

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Study summary

Who: Male mice given alcohol, with or without vinegar polyphenol extract treatment
Design: Controlled animal study with antibiotic microbiota depletion and fecal microbiota transplant arms
Dose: 750 mg/kg vinegar polyphenol extract; 20 phenolic compounds identified, 4-hydroxybenzoic acid 46.67% of total
Primary result: Significantly reduced serum ALT and AST, lower hepatic oxidative stress and inflammation, suppressed p38/JNK/ERK1/2 activation
Secondary: Restored intestinal barrier integrity, reduced LPS burden, increased Akkermansia and Bacteroides, decreased Escherichia, restored acetic and propionic acid levels
Funding / conflicts: Funders listed in the journal record: Natural Science Foundation of Tianjin Municipality; Tianjin Municipal Science and Technology Program. Conflicts not reported in the abstract.
Date: Oct 19, 2026