Dijon mustard is one of the most keto-friendly condiments you can use. A standard teaspoon contains just 0.2g net carbs and 5 calories, making it virtually impossible to knock yourself out of ketosis with normal serving sizes. Most brands register at 0g net carbs per serving on their nutrition labels because the amounts are small enough to round down.
Net Carbs in Dijon Mustard
A teaspoon of Dijon mustard has about 0.3g total carbs, 0.2g fiber, and 0.2g net carbs. Even if you use a full tablespoon (a generous amount for most meals), you’re looking at roughly 0.6g net carbs. For context, most keto diets allow 20 to 50g of net carbs per day, so Dijon barely registers.
The base ingredients explain why the carb count stays so low. Grey Poupon, one of the most popular brands, lists distilled white vinegar, mustard seed, water, salt, and white wine as its primary ingredients. Sugar does appear on the label, but in such trace amounts that it rounds to 0g per serving. There’s no honey, corn syrup, or other concentrated sweetener hiding in traditional Dijon.
How Dijon Compares to Other Mustards
Yellow mustard is slightly lower in carbs than Dijon, with about 0.19g net carbs per teaspoon compared to Dijon’s 0.27g. The difference is negligible. Both are excellent keto options, and choosing between them is purely a matter of taste preference.
Honey mustard is a different story. A teaspoon of French’s Honey Dijon Mustard has 2g of carbs and 1g of sugar, roughly ten times the net carbs of regular Dijon. That may not sound like much, but honey mustard tends to be used more generously as a dipping sauce or salad dressing base. A few tablespoons can add 6 to 10g of carbs to a meal, which matters when your daily budget is tight. If you’re on keto, stick with plain Dijon and skip any variety with “honey” in the name.
Brands With the Lowest Carb Counts
Most Dijon mustard brands are keto-friendly, but some are cleaner than others. Several organic options report 0g net carbs per 5g serving, including 365 Organic, Primal Kitchen Organic, Annie’s Organic, and Organicville. Mainstream brands like French’s Dijon, Gulden’s Stone Ground Dijon, and Kroger Dijon also come in at 0g net carbs per serving.
When shopping, the main thing to check on the label is whether sugar, honey, or any syrup appears high in the ingredients list. If sugar is near the bottom (as it is with Grey Poupon), the amount is too small to affect your macros. If honey or a sweetener appears in the first few ingredients, that’s a different product and likely not worth the carbs.
Using Dijon on a Keto Diet
Dijon mustard is useful on keto beyond just squeezing it on a burger. Mixed with olive oil and a splash of vinegar, it becomes a simple salad dressing with almost no carbs. It works as a marinade base for chicken thighs or salmon, adds flavor to deviled eggs, and gives depth to cream sauces made with heavy cream or butter. Because it’s so low in carbs, you can use it freely without measuring or tracking.
The vinegar in Dijon may offer a small metabolic bonus as well. Research published in the Journal of Diabetes Research found that vinegar consumption lowered blood sugar, insulin levels, and triglycerides after meals in people with type 2 diabetes. The acetic acid in vinegar appears to slow carbohydrate absorption and improve how muscles take up glucose. The amounts of vinegar in a serving of mustard are small, so this isn’t a reason to treat Dijon as a health food, but it does mean the ingredient list is working in your favor rather than against you.
What to Watch Out For
The only real risk with mustard on keto is grabbing the wrong bottle. “Dijon” and “honey Dijon” sit side by side on store shelves, and flavored mustards can contain 5 to 10 times more sugar. Some “Dijon-style” dressings and sauces also add sugar, vegetable oil, or starch as thickeners, bumping the carb count well beyond what plain mustard contains. As long as you’re buying straightforward Dijon mustard, not a flavored or sweetened variation, you can use it as a staple condiment on keto without a second thought.