Propyl Gallate vs Tertiary Butylhydroquinone: which is worse?
Quick answer: Both score equally on our risk model. Propyl Gallate is — in the EU and — in the US; Tertiary Butylhydroquinone is — in the EU and — in the US.
| Property | Propyl Gallate | Tertiary Butylhydroquinone |
|---|---|---|
| EU status | — | — |
| US status | — | — |
| Risk level | — | — |
| Banned in | Japan (banned for food use) | Japan (banned for food use) |
| Restricted in | European Union (restricted to 200 mg/kg in specific fat/oil applications), United Kingdom, Australia | European Union (banned in baby foods; restricted in fats/oils to 100-200 mg/kg), United Kingdom, Australia |
| Category | additive | additive |
| Where it hides | — | — |
What is Propyl Gallate?
Propyl gallate is a synthetic antioxidant preservative derived from gallic acid and propanol. It prevents oxidation of fats and oils, extending shelf life of fat-containing foods. It is often used in combination with BHA and BHT for synergistic antioxidant effect. Chemical formula: C10H12O5.
What is Tertiary Butylhydroquinone?
Tertiary butylhydroquinone (TBHQ) is a synthetic phenolic antioxidant preservative derived from butane. It is one of the most potent antioxidants for polyunsaturated fats and oils and is commonly used in fast-food frying oils. Its chemical formula is C10H14O2.
Documented risks
Propyl Gallate: Animal studies have shown propyl gallate may cause liver damage at high doses. Concerns about estrogenic activity have been raised — some studies suggest propyl gallate may weakly mimic estrogen. Contact dermatitis and allergic reactions are documented in both food and cosmetic applications. Japan banned propyl gallate for food use as part of its precautionary approach to synthetic food preservatives. NTP bioassays found dose-dependent liver effects. EFSA's re-evaluation set an ADI of 0.1 mg/kg body weight — one of the lowest ADIs for food additives, reflecting toxicological concern.
Tertiary Butylhydroquinone: At high doses in animal studies, TBHQ has been shown to cause precancerous stomach lesions (squamous cell hyperplasia) in female rats. A study in Food and Chemical Toxicology documented these dose-dependent precancerous changes. The FDA limits TBHQ to 0.02% of fat content, reflecting dose-dependent safety thresholds. Immune function concerns emerged from research published around 2019-2020. A study (Farouk Musa and colleagues) found that TBHQ impaired the adaptive immune response to influenza in mouse models, including reduced effectiveness of influenza vaccination. EWG highlighted this research in its analysis. These findings have not been confirmed in human clinical trials but raised new dimensions of concern beyond cancer. Neurotoxicity: animal studies have documented TBHQ can cause precursors to certain types of cell injury in neural tissue at high doses, though effects at typical dietary exposure are not established. Allergic reactions including urticaria and contact dermatitis from TBHQ-containing cosmetics and personal care products are documented in dermatology literature. Japan banned TBHQ for food use. The EU restricts it in baby food (completely banned) and in adult food categories with maximum permitted levels. Australia and the UK restrict it.
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