Most hoisin sauce is made with wheat — but Lee Kum Kee makes a gluten-free version, and it’s easy to make at home.
Sometimes. Hoisin is fermented soybean paste, sugar, vinegar, garlic, and a thickener — the base isn’t a gluten grain, but the majority of mainstream hoisin sauces add wheat flour and/or wheat-containing soy sauce. Standard Lee Kum Kee Hoisin lists wheat; Lee Kum Kee Gluten-Free Hoisin Sauce (spices, soybeans, garlic) is a separate, safe SKU. The default product is not gluten-free — read the label, choose a labeled-GF hoisin, and watch restaurant Peking duck, char siu, and mu shu.
Hoisin sauce is a “sometimes,” and the safe default is to assume a bottle is NOT gluten-free until you’ve confirmed it. The thick, sweet-savory glaze on Peking duck and char siu gets its body from wheat flour in most mainstream versions, and many also carry a wheat-based soy sauce. The soybean paste everyone associates with hoisin isn’t the issue — the added wheat is.
The good news: the dominant brand makes a dedicated gluten-free hoisin, and a homemade version is genuinely easy. The trap, as with oyster sauce, is that the same brand sells both a wheat version and a gluten-free version that look almost identical.
Why Hoisin Sauce Is “Sometimes”
Hoisin is built on fermented soybean paste, sugar, vinegar, garlic, and chili, then thickened. Per FDA labeling rules, the gluten-containing grains are wheat, barley, and rye. Soybean, sugar, vinegar, and garlic are none of those — but the thickener and the soy sauce usually are. Most mainstream hoisin uses wheat flour for its glossy, clingy texture and is built on a wheat-containing soy sauce, which makes the default product not gluten-free.
A minority of products are deliberately wheat-free. The clearest example is Lee Kum Kee, the category’s dominant brand: its standard Hoisin Sauce uses a fermented soybean paste that includes wheat flour and lists wheat as an allergen, while its separate Gluten-Free Hoisin Sauce is made from selected spices, soybeans, and garlic with no wheat flour. When such a product is labeled gluten-free it meets the FDA under-20-ppm standard. The shopping rule is simple: the gluten is the added wheat, so read the exact product name and ingredient panel.
Hoisin is also one of the easiest sauces to make gluten-free at home — a blend of gluten-free tamari, a little sugar or honey, rice vinegar, garlic, five-spice, and a cornstarch slurry recreates it without any wheat. That’s often the most reliable route for a celiac kitchen.
Brand-by-Brand: Which Hoisin Sauce Is Gluten-Free?
Most hoisin is wheat-based; a specific labeled SKU is the safe choice. Note the same-brand split on Lee Kum Kee.
| Brand / Product | Made with | Gluten-Free? |
|---|---|---|
| Lee Kum Kee Gluten-Free Hoisin Sauce | Spices, soybeans, garlic — no wheat | ✓ Yes — the GF SKU |
| Homemade hoisin (tamari + GF thickener) | Tamari, sugar, rice vinegar, cornstarch | ✓ Yes |
| Premier Japan / specialty labeled-GF hoisin | No wheat (labeled GF) | ✓ Check the label/claim |
| Lee Kum Kee standard Hoisin Sauce | Soybean paste with wheat flour | ✗ Not gluten-free (lists wheat) |
| Kikkoman / generic / store-brand hoisin | Wheat flour / wheat soy sauce | ✗ Not gluten-free (unless labeled) |
| Restaurant Peking duck / char siu / mu shu | Standard wheat hoisin glaze | ✗ Assume not GF unless confirmed |
Cross-Contamination Risk
Manufacturing
High
- Most mainstream bottles add wheat flour or wheat soy sauce.
- Wheat is a gluten-containing grain — default not GF.
- Only a labeled GF hoisin (Lee Kum Kee GF) is safe.
Restaurant
High
- Standard glaze for Peking duck, char siu, mu shu.
- Common spring-roll and lettuce-wrap dip.
- The wheat is the gluten, not the soybean.
Home
Low
- Safe with a labeled GF hoisin (Lee Kum Kee GF).
- Or make it with a GF thickener and tamari.
- Check the exact SKU, not just the brand.
Hoisin Sauce — GF Status
- Lee Kum Kee Gluten-Free Hoisin Sauce — gluten-free (the GF SKU)
- Homemade hoisin (tamari + cornstarch) — gluten-free
- Specialty labeled-GF hoisin (e.g., Premier Japan) — gluten-free; confirm the label
- Standard Lee Kum Kee Hoisin — NOT gluten-free (wheat flour)
- Kikkoman / generic / store-brand hoisin — usually NOT gluten-free
- Restaurant Peking duck / char siu / mu shu glaze — assume NOT GF unless confirmed
What to Look For — Or Avoid
- A product specifically named “Gluten-Free Hoisin Sauce”
- No wheat flour and no wheat-based soy sauce listed
- A homemade tamari-and-cornstarch hoisin
- Standard Lee Kum Kee Hoisin (lists wheat)
- Wheat flour or soy sauce in the ingredient list
- Assuming Peking duck or char siu glaze is gluten-free
Frequently Asked Questions
Hoisin trips up celiac diners because it’s a hidden glaze in beloved restaurant dishes and the dominant brand sells both a wheat and a gluten-free version. These answers make the safe choice clear.
Is hoisin sauce gluten-free?
Sometimes. Most mainstream hoisin sauces contain wheat flour as a thickener or wheat-based soy sauce, so the default product is not gluten-free. A minority — such as Lee Kum Kee Gluten-Free Hoisin Sauce — are specifically wheat-free. Read the label every time.
Is Lee Kum Kee hoisin sauce gluten-free?
It depends on the SKU. Standard Lee Kum Kee Hoisin Sauce uses a soybean paste that includes wheat flour and lists wheat as an allergen — not gluten-free. Lee Kum Kee Gluten-Free Hoisin Sauce (spices, soybeans, garlic, no wheat) is the safe one to buy.
Why does hoisin sauce contain gluten?
The gluten is added wheat — most brands use wheat flour as a thickener and/or a wheat-containing soy sauce. The fermented soybean paste, sugar, and garlic base are not gluten grains; the wheat is the issue.
Can I make gluten-free hoisin sauce at home?
Yes, easily. A blend of gluten-free tamari, a little sugar or honey, rice vinegar, garlic, Chinese five-spice, and a cornstarch slurry recreates hoisin with no wheat — often the most reliable route for a celiac kitchen.
Is Peking duck or char siu gluten-free?
Usually not. Hoisin is the standard glaze for Peking duck, char siu pork, and mu shu, and mainstream hoisin contains wheat. Assume these dishes are not gluten-free unless the restaurant confirms a gluten-free hoisin.
Is hoisin the same as oyster sauce for gluten?
The logic is the same — both are usually wheat-thickened or contain wheat-based soy sauce, so both default to not gluten-free. And like oyster sauce, the same brand (Lee Kum Kee) sells a specific gluten-free version alongside the standard wheat one.
Can people with celiac disease eat hoisin sauce?
Yes — but only a specifically labeled gluten-free hoisin (such as Lee Kum Kee Gluten-Free) or a homemade tamari-based version. The standard mainstream product contains wheat; avoid restaurant hoisin dishes unless a gluten-free hoisin is confirmed.