Is oyster sauce gluten-free? Usually not

Usually not. Oyster sauce is oyster extract, sugar and salt, thickened with starch, and most versions contain wheat flour, wheat starch or soy sauce brewed with wheat.

What to check

• The label: gluten-free oyster sauces exist and are labelled.
• In restaurants: oyster sauce is in many stir-fries, greens and noodle dishes in Chinese, Thai and Vietnamese cooking. Ask, and point to the words on a card if you need to.

Keep reading

• Is fish sauce gluten-free?
• Is hoisin sauce gluten-free?
• Is soy sauce gluten-free?

Sources: Coeliac UK, EU Regulation 1169/2011 and 828/2014, US FDA gluten-free rule and FALCPA, Codex Alimentarius (gluten-free = 20 mg/kg or less). Checked 28 September 2026. We inform, we don’t diagnose: for medical questions, your doctor or dietitian has the last word.