Overview
About oyster sauce
Oyster sauce is a thick, savory Chinese sauce cooked down from oyster extract, sugar and soy, and its triggers are less about histamine than about glutamate, FODMAPs and gluten.
It is high in free glutamate, the umami compound that gives it that deep savory hit, high in FODMAPs from the sugars and thickeners used to build its body, and it is usually made with wheat, so it is not gluten free. If a stir-fry leaves you bloated, foggy or headachy, oyster sauce is a likely culprit even though it is not especially high in histamine.
Sensitivities
How oyster sauce scores
Watch for
What trips people up
- High in free glutamate, the natural umami and MSG-like compound, which can trigger headache in glutamate-sensitive people
- High in FODMAPs, so it can cause bloating and gas in a sensitive or IBS gut
- Usually made with wheat, so standard versions are not gluten free: check labels if you are gluten sensitive or coeliac
- A poor fit for SIBO given the fermentable sugars and thickeners
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about oyster sauce
Does oyster sauce contain MSG or glutamate?
Oyster sauce is naturally high in free glutamate from the concentrated oyster extract, and many brands add MSG as well. That glutamate is what gives it its intense umami flavor, and it is the main reason some people get headaches after glutamate-heavy dishes.
Is oyster sauce gluten free?
Usually not. Most oyster sauce is thickened or flavored with wheat, so standard versions are not safe on a gluten-free or coeliac diet. Some brands make a gluten-free version, but you have to check the label.
Is oyster sauce low FODMAP?
No. Oyster sauce is high in FODMAPs from the sugars and thickeners used to make it, so it can bring on bloating and gas. Fresh lemongrass, a spoon of white miso, or nutritional yeast give savory depth with a lower FODMAP load.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.