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The facts: Tertiary Butylhydroquinone is banned in 1 country/region (including Japan (banned for food use)), though the FDA still allows it in the US. We can't tell you whether it's safe for your pregnancy — that's a conversation for your OB-GYN or midwife. What we can do is show you the regulatory facts and flag Tertiary Butylhydroquinone on any product's label so you can decide with your provider. Commonly found in: McDonald's french fries (cooking oil), Microwave popcorn (certain brands), Cheez-It crackers.
TL;DR: Tertiary Butylhydroquinone is banned in the EU and allowed in the US. Here's what to know if you're pregnant.
| EU status | Banned |
|---|---|
| US status | Allowed |
| Risk level (regulatory) | — |
| Where it shows up | McDonald's french fries (cooking oil), Microwave popcorn (certain brands), Cheez-It crackers, Ritz crackers, Various cooking oils, Frozen fish products |
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.
TBHQ is particularly effective for preserving polyunsaturated vegetable oils used in deep frying, preventing oxidative rancidity that would degrade flavor and nutritional value. It extends the fry life of cooking oils and the shelf life of fried foods and crackers. McDonald's uses TBHQ to stabilize its cooking oil.
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.
For educational use only. This page summarizes the regulatory status of Tertiary Butylhydroquinone with citations to the primary sources below. It is not medical advice and is not pregnancy-specific medical guidance. Consult your OB-GYN or midwife for decisions about your pregnancy.
Yes. Tertiary Butylhydroquinone is banned in Japan (banned for food use); restricted in European Union (banned in baby foods; restricted in fats/oils to 100-200 mg/kg), United Kingdom, Australia. The FDA still allows it in the US.
That's a decision for you and your OB-GYN or midwife — we don't give medical advice. What we can tell you is the regulatory status above. Many people choose to limit additives during pregnancy out of caution; bring this page and its sources to your next appointment.
Commonly found in McDonald's french fries (cooking oil), Microwave popcorn (certain brands), Cheez-It crackers, Ritz crackers, Various cooking oils, Frozen fish products. Scan any product's barcode to check its label for Tertiary Butylhydroquinone.
Mixed tocopherols, rosemary extract, and ascorbyl palmitate are the primary alternatives. Modified atmosphere packaging and active packaging reduce the need for chemical antioxidants. Europe's food industry functions effectively without TBH See the pregnancy-conscious swaps below.
Scan any product's barcode and instantly see if it contains Tertiary Butylhydroquinone or other ingredients restricted overseas.
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Audited products that don't contain Tertiary Butylhydroquinone.
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