Is Tempeh Gluten-Free?

From The New Day Notebook · Facts last checked October 21, 2026 · General information, not medical advice

Tempeh made from soybeans is naturally gluten-free. This firm, fermented food is a popular plant-based protein that fits well into a gluten-free diet.

However, not all tempeh is made the same way. Some products include grains that contain gluten, such as barley or wheat, which makes them unsafe for people who must avoid gluten. The key to safely enjoying tempeh is to carefully read the ingredient list every time.

Tempeh and gluten at a glance

Why tempeh is usually gluten-free

Tempeh made only from soybeans is gluten-free. Soy is a naturally gluten-free food. The fermentation process that creates the firm tempeh cake does not add gluten. When tempeh is made without any added grains, it is suitable for a gluten-free diet. Many plain, unflavored tempeh products fall into this category, making them a reliable choice.

Where gluten can hide in tempeh

Gluten can be present in tempeh in two primary ways: through added grains in the tempeh itself or from marinades and sauces.

• Multigrain Tempeh: Some producers add grains to their tempeh for different flavors and textures. If these grains are barley or wheat, the final product will contain gluten. Always check the ingredients list for words like barley, wheat, or multigrain.
• Marinades and Sauces: Pre-marinated tempeh products can be a source of hidden gluten. Many marinades use traditional soy sauce, which is typically brewed with wheat. Look for tempeh that is either plain or marinated with a sauce specifically made with gluten-free tamari or another gluten-free soy sauce alternative.

Shopping, cooking, and eating out

When buying tempeh, the most reliable method is to choose products that are explicitly labeled or certified gluten-free. In the United States, a food labeled “gluten-free” must contain less than 20 parts per million (ppm) of gluten. If a product is not labeled, read the full ingredient list to ensure no gluten-containing grains are included.

At home, you have full control. Start with plain, gluten-free tempeh and use gluten-free ingredients for your own marinades and sauces. When dining at a restaurant, it is essential to ask how the tempeh is prepared. Inquire about the ingredients in the tempeh itself and in any marinade or sauce it is served with. Also ask if it is cooked on a shared surface or in a shared fryer with gluten-containing foods to avoid cross-contact.

When to loop in your doctor or dietitian

For individuals with celiac disease, a strict, lifelong gluten-free diet is the only treatment. If you are considering a gluten-free diet for medical reasons or need help managing your diet after a diagnosis, consult with your doctor or a registered dietitian. Do not begin a gluten-free diet before completing medical testing for celiac disease, as this can affect the accuracy of the results.

• If you think gluten is making you unwell, ask about celiac disease testing before cutting gluten out: testing needs gluten in the diet
• If you have celiac disease and still have symptoms on a gluten-free diet
• If you are unsure whether oats, wheat starch or a specific ingredient suits you
• For help planning a gluten-free diet that still meets your nutrition needs

Sources

• Celiac Disease Foundation: Gluten-Free Foods
• Celiac Disease Foundation: Sources of Gluten
• U.S. Food and Drug Administration: Gluten-Free Labeling of Foods

Last checked October 21, 2026. Recipes and ingredients change: always read the current label.