Store-Bought Mayonnaise

Is Store-Bought Mayonnaise Allowed on Keto?

CondimentsKeto
Keto Status
Allowed

Quick Summary

On the Keto diet, store-bought mayonnaise is considered an Allowed food. The reason comes down to net carbohydrate content — store-bought mayonnaise is low enough in net carbs to fit comfortably inside a daily keto budget without exhausting it. Per 100g, store-bought mayonnaise contains 0.3g total carbohydrates, yielding 0.3g net carbs.

Per 100g · Source: USDA FoodData Central

688kcalCalories
0gProtein
77.8gFat
0.3gCarbs
0gFiber
0.3gNet Carbs

Store-bought mayonnaise is classified as Allowed under standard keto guidelines — full-fat commercial mayonnaise contains 0g of carbohydrates per tablespoon and is widely used in keto cooking.

Key Takeaways

  • Store-bought mayonnaise is classified as Allowed under standard keto guidelines.
  • Full-fat mayonnaise contains 0g net carbohydrates per tablespoon serving.
  • Low-fat and light mayonnaise are not classified as compliant due to added sugar and starch.
  • Avocado oil-based mayonnaise (Primal Kitchen, Chosen Foods) is a referenced preferred variety.

Classification Overview

Store-bought mayonnaise is one of the most consistently referenced keto-compliant condiments, provided the full-fat variety is selected.

Full-Fat Mayonnaise Composition

Full-fat commercial mayonnaise is composed of oil (approximately 80–85%), eggs, vinegar or lemon juice, and salt. A tablespoon (14g) contains approximately 10–12g of fat, 0g of carbohydrates, and 0g of protein. The oil-and-egg emulsion is entirely fat with negligible carbohydrates from the acidic ingredients.

Major Brand Review

Standard full-fat mayonnaise products classified as compliant:

  • Hellmann’s/Best Foods Real Mayonnaise: 0g carbs/tbsp (soybean oil base)
  • Duke’s Mayonnaise: 0g carbs/tbsp (soybean oil, no added sugar)
  • Primal Kitchen Avocado Oil Mayonnaise: 0g carbs/tbsp
  • Chosen Foods Avocado Oil Mayonnaise: 0g carbs/tbsp

Published keto references note that avocado oil-based mayonnaise has a more favorable omega-6 to omega-3 fatty acid ratio than soybean oil-based products.

Low-Fat and Light Mayonnaise

Reduced-fat mayonnaise products (Hellmann’s Light, Best Foods Light) contain 2–4g of carbohydrates per tablespoon from added sugar, starch, and water used to replace the fat. Fat-free mayonnaise contains even more carbohydrates per tablespoon. Published keto references uniformly classify reduced-fat and fat-free mayonnaise as not compliant.

Flavored Mayonnaise

Flavored commercial mayonnaise products — garlic aioli, chipotle, sriracha — may contain 1–3g of carbohydrates per tablespoon from added flavoring ingredients, sauces, or sugar. These require label review, as carbohydrate content varies by flavor.

Summary

Store-bought mayonnaise is classified as Allowed under standard keto guidelines. Full-fat commercial mayonnaise contains 0g of carbohydrates per tablespoon and is one of the most consistently referenced keto-compliant condiments. Low-fat and light varieties are not compliant due to added sugar and starch. Published keto references recommend full-fat mayonnaise — particularly avocado oil-based varieties — as the preferred keto condiment and cooking fat.

This is reference-only classification content and does not constitute medical or dietary advice.

Why Store-Bought Mayonnaise Is Allowed

Store-Bought Mayonnaise pass{es} Keto criteria because store-bought mayonnaise is low enough in net carbs to fit comfortably inside a daily keto budget without exhausting it. Per 100g, store-bought mayonnaise contains 688kcal with 0g protein, 77.8g fat, 0.3g carbohydrates. On keto, the relevant number on the label is total carbohydrates minus fiber — the "net carb" figure most practitioners track against a 20–50g daily ceiling. The classification holds for the standard form of store-bought mayonnaise — flavored, processed, or pre-prepared versions can shift it.

Key Ingredients to Watch

  • Hidden sugar, often the second or third ingredient on the label
  • Sodium content, which is high in soy sauce, fish sauce, and most fermented condiments
  • Animal-derived ingredients like anchovies in Worcestershire and Caesar dressings

Common Mistakes

  • Assuming all brands of store-bought mayonnaise are equally compatible — flavored, processed, or pre-prepared versions often add ingredients that change the classification.
  • Ignoring portion size on the assumption that an Allowed food can be eaten without limits.
  • Treating store-bought mayonnaise as a "free pass" and using it as the foundation of every meal, which crowds out the variety the diet usually relies on.

Similar Options

Apple Cider Vinegar Allowed

Apple Cider Vinegar is another Allowed condiments option in the same group.

Buffalo Sauce Allowed

Buffalo Sauce is another Allowed condiments option in the same group.

Coconut Aminos Allowed

Coconut Aminos is another Allowed condiments option in the same group.

Frequently Asked Questions

Is store-bought mayonnaise allowed on keto?
Store-bought mayonnaise is classified as Allowed under standard keto guidelines. Full-fat commercial mayonnaise (Hellmann's, Duke's, Best Foods) contains 0–1g of carbohydrates per tablespoon serving. Its high fat content from oil and eggs is consistent with standard keto macronutrient targets.
How many carbs are in store-bought mayonnaise?
Full-fat commercial mayonnaise contains approximately 0g of carbohydrates per tablespoon (14g). Some brands contain trace amounts (less than 1g) from added lemon juice, sugar, or vinegar. A 2-tablespoon serving also contains approximately 0–1g of carbohydrates. There is essentially no carbohydrate contribution from full-fat mayonnaise at typical serving sizes.
Which mayonnaise brands are keto-compliant?
Full-fat versions of major brands — Hellmann's/Best Foods Real Mayonnaise, Duke's Mayonnaise, Primal Kitchen Mayo (avocado oil-based), Chosen Foods Avocado Mayo — all contain 0g of carbohydrates per serving and are classified as compliant. Published keto references frequently reference Duke's and avocado oil-based mayonnaise as preferred full-fat options.
Is low-fat or light mayonnaise keto-compliant?
Low-fat and light mayonnaise are not classified as keto-compliant under standard guidelines. These products compensate for reduced fat with added sugar, starch, and water, resulting in 3–6g of carbohydrates per tablespoon — substantially higher than full-fat mayonnaise. Published keto references specify full-fat mayonnaise as the only compliant mayonnaise variety.
What makes store-bought mayonnaise different from homemade on keto?
Both store-bought full-fat mayonnaise and homemade mayonnaise contain approximately 0g of carbohydrates per tablespoon and are classified as compliant. The practical advantage of store-bought mayonnaise is convenience and shelf stability. Some store-bought brands use soybean oil (a high-omega-6 oil), while avocado oil-based brands are referenced in keto sources as a preferred alternative.
Can I use mayonnaise freely on keto?
Full-fat mayonnaise is classified as Allowed and can be used in standard keto cooking and as a condiment. There are no specific serving size restrictions for mayonnaise under standard keto guidelines — it contributes essentially 0g of carbohydrates regardless of serving size. Individual calorie targets are separate from keto carbohydrate classification.

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Store-Bought Mayonnaise on Other Diets

See how store-bought mayonnaise is classified across different dietary frameworks.

Whole30 Limited Paleo Limited Mediterranean Limited Vegan Not Allowed Gluten-Free Limited DASH Limited Vegetarian Allowed Pescatarian Allowed Carnivore Limited Low-Carb Allowed Low-Fat Limited Low-Sodium Limited Anti-Inflammatory Limited Diabetic-Friendly Allowed Low-FODMAP Limited AIP Limited High-Protein Limited Alkaline Limited Kosher Limited Halal Limited Whole-Food Not Allowed Raw-Food Limited Sugar-Free Limited Kidney-Friendly Limited
Compare all diets for store-bought mayonnaise

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