Plain soybeans and edamame are naturally gluten-free. Soy products like tofu and soy milk are generally gluten-free, but soy sauce is typically made with wheat. Always check processed soy products.

Contents

What's naturally gluten-free Where soy foods actually go wrong Practical guidance FAQ Sources

Is soy gluten-free?

Yes. Soybeans and most plain soy foods are naturally gluten-free. The exceptions are specific products, not soy itself, and two of them already have their own answer on this site.

What's naturally gluten-free

Whole soybeans, edamame, plain tofu, plain soy milk, soy flour, soybean oil, and soy lecithin are all gluten-free as a starting point — none of them involve a gluten-containing grain.

Where soy foods actually go wrong

The gluten risk in soy foods comes from what gets added, not from the soybean itself:

Soy sauce is usually brewed with wheat as a major ingredient, not a trace one. This is common enough, and different enough from the rest of this list, that it has its own page — see is-soy-sauce-gluten-free for the full breakdown, including tamari and coconut aminos as substitutes.
Miso depends on which grain the koji culture was grown on. See is-miso-gluten-free for that distinction.
Flavored or marinated tofu can pick up soy sauce or wheat-based seasoning in the marinade, even though plain tofu is fine.
Tempeh is naturally gluten-free when it's plain fermented soybeans, but multi-grain versions sometimes add barley or wheat for texture — check the label rather than assuming.
Soy-based meat substitutes occasionally get blended with seitan (wheat gluten) to improve texture. Soy and wheat gluten are different proteins, so a "soy protein" ingredient list is worth a second look if seitan or wheat gluten also appears.

Practical guidance

Plain, unflavored soy foods are safe to treat as a default yes. Anything soy-based that's flavored, marinated, fermented, or blended into a meat substitute is worth a label check, for the same reason many processed foods are — not because soy itself is the risk.