Is Tempeh Gluten-Free?

|Team TEMPTÉ
tempeh with soy sauce on a plate

Short answer: plain tempeh is, but not every tempeh on the shelf is plain.

Tempeh in its traditional form contains two things — soya beans and a culture called Rhizopus. Neither contains gluten. So a block of plain soya tempeh is naturally gluten-free.

The complications come from everything else that gets added, and there are three worth knowing about.


1. Not all tempeh is made from soya alone

Tempeh is defined by the fermentation, not the bean, which is why producers experiment. Multigrain versions exist, and some of them use grains that contain gluten.

Multigrain tempeh is the one to watch for. Some versions blend soya with barley, which contains gluten — a widely sold American three-grain tempeh does exactly this, and it isn't suitable no matter what the rest of the ingredients say.

This matters less on British shelves than American ones. Most of the tempeh you'll find in UK supermarkets is soya-based. But multigrain versions do turn up in health food shops and online, and grain-based tempeh is becoming more common as producers experiment beyond soya.

Under UK law any gluten-containing cereal must be named and emphasised in the ingredients list, usually in bold. So it will be there if it's there. The same question comes up about tofu, which is also gluten-free in its plain form but arrives there by an entirely different route.


2. The soy sauce risk is real, but it's mostly not on the supermarket shelf

Traditional soy sauce is brewed from soya beans and wheat. It isn't gluten-free, and it's the classic hidden gluten in anything Asian-inspired.

Where this catches people out is home cooking and eating out. Plenty of tempeh recipes online and dishes sold in restaurants call for soy sauce or tamari. Tamari is the usual substitute — though not all tamari is wheat-free, so only the kind explicitly labelled gluten-free is reliable.

What's worth knowing is that the flavoured tempeh sold in UK supermarkets mostly sidesteps this. The leading British brands season with yeast extract, salts, oils and spices rather than soy sauce, and several of their flavoured lines carry a gluten-free claim.

So the honest version: if you're buying a flavoured tempeh in a British supermarket, it very likely contains no gluten. If you're marinating a plain block yourself, or ordering tempeh in a restaurant, that's where the soy sauce turns up.


3. "Gluten-free" on a label means something specific

In the UK, "gluten-free" is a regulated claim, not a general reassurance.

Under retained Regulation (EU) No 828/2014, a food can only be labelled gluten-free if it contains no more than 20mg of gluten per kilogram — 20 parts per million — as sold. That threshold is set at a level considered tolerable for people with coeliac disease, and a business making the claim has to be able to substantiate it.

There's a useful distinction here. A product can be made entirely from gluten-free ingredients and still not carry the claim, because the producer hasn't tested for cross-contamination from a shared facility. 

You can see this on the shelf. It's common to find two products from the same producer where one carries a straight gluten-free claim and the other is described only as having no gluten-containing ingredients. Same maker, different level of assurance — and for a coeliac, that difference matters.

So: an ingredients list with no gluten in it is a good sign. A gluten-free claim is a stronger one, because someone has had to prove it meets the legal threshold.


What this means in practice

If you have coeliac disease, look for the gluten-free claim or the Crossed Grain trademark rather than reading the ingredients and inferring. Cross-contamination is the risk that ingredients lists don't capture, and tempeh is often produced in facilities handling grains.

If you're avoiding gluten by preference rather than necessity, checking the ingredients list is usually enough — and plain tempeh will almost always pass.

Either way, the answer to the original question is: usually, but check the packet. Tempeh gives you fewer places for gluten to hide than most foods, which is a reasonable starting point.


A note on our own product

Our snacks are still in development and we haven't finalised our seasoning or our manufacturing arrangements. We've written separately about why we bake rather than fry, and what we're trying to keep out of the bag. But we're not going to make a gluten-free claim before we can substantiate one — that's how the regulation works and it's also just the honest position. When we know, it'll be on the packet.


Keep reading

 

Curious what we’re making with tempeh? Meet TEMPTÉ →⁠


Sources

This article is general information, not dietary advice. If you have coeliac disease, Coeliac UK is the authority worth consulting.