Mayonnaise is moderate in sodium, not high. A tablespoon of standard commercial mayo contains roughly 70 to 160 milligrams of sodium, depending on the brand. That’s about 3% to 7% of the recommended daily limit of 2,300 milligrams. Compared to truly high-sodium condiments like soy sauce, mayo is relatively mild, but it can still add up if you use it generously.
How Much Sodium Is in a Tablespoon
Most unflavored mayonnaises land between 70 and 120 milligrams of sodium per tablespoon, according to a review by the Center for Science in the Public Interest. Some classic and homemade versions run higher, between 110 and 160 milligrams. The variation comes down to how much salt a manufacturer adds during production. Salt is an optional ingredient in commercial mayo under federal food standards, so every brand makes its own call.
To put those numbers in context, the Dietary Guidelines for Americans recommend no more than 2,300 milligrams of sodium per day. A single tablespoon of mayo at 100 milligrams uses up only about 4% of that budget. But most people don’t stop at one tablespoon. A thick layer on a sandwich might be two tablespoons, and a chicken salad or tuna salad recipe can call for a quarter cup or more. Four tablespoons could mean 400 to 640 milligrams of sodium from mayo alone.
How Mayo Compares to Other Condiments
Mayo sits in the middle of the condiment sodium spectrum. Ketchup delivers around 150 to 190 milligrams per tablespoon, which is slightly higher than many mayos. Yellow mustard runs about 55 to 170 milligrams per teaspoon, varying widely by brand. Soy sauce is in a different category entirely: a single tablespoon contains over half the American Heart Association’s stricter 1,500-milligram daily target, often exceeding 900 milligrams.
So if you’re comparing mayo to soy sauce, teriyaki, or even many bottled salad dressings, mayo is a lower-sodium choice. If you’re comparing it to plain olive oil or a squeeze of lemon, mayo adds sodium where those options add none.
Where the Sodium Comes From
Mayonnaise is essentially oil, egg yolk, and an acid like vinegar or lemon juice. None of those base ingredients contain meaningful sodium on their own. The sodium comes almost entirely from added salt, which manufacturers include for flavor and preservation. This is actually good news if you’re trying to cut back, because it means the sodium in mayo is adjustable rather than inherent to the product.
Light, Vegan, and Low-Sodium Options
Switching to a light or reduced-fat mayo won’t necessarily lower your sodium intake. Light versions cut calories (typically 40 to 60 per tablespoon compared to 90 to 100 for regular), but they often compensate for the reduced fat with extra salt, sugar, or other flavor enhancers. Always check the nutrition label rather than assuming “light” means “less sodium.”
Plant-based mayonnaises vary. Vegenaise Original, one of the more popular vegan brands, lists 70 milligrams of sodium per tablespoon, which puts it at the low end of the range. Other vegan brands may be higher or lower. The same rule applies: the label is the only reliable guide.
Homemade mayo gives you the most control. The American Kidney Fund highlights that store-bought and even classic homemade recipes can run 110 to 160 milligrams per tablespoon, but you can simply reduce or skip the salt when making it yourself. A basic recipe of oil, egg yolk, lemon juice, and a pinch of mustard powder produces mayo with almost no sodium at all.
Mayo on a Blood Pressure Diet
The DASH diet, one of the most widely recommended eating plans for lowering blood pressure, does not ban mayonnaise. The Mayo Clinic’s breakdown of the DASH plan includes one tablespoon of mayo as a single serving within the fats and oils category, which allows two to three servings per day. The emphasis is on choosing low-salt options and reading labels carefully rather than eliminating specific foods.
The practical takeaway: if you’re watching your sodium because of blood pressure, kidney health, or heart disease risk, mayo is fine in small amounts. The real concern isn’t the mayo itself but how it combines with everything else on the plate. A sandwich with mayo, deli meat, pickles, and cheese can easily cross 1,000 milligrams of sodium before you’ve thought twice about it. Mayo contributes a small share of that total, but every source matters when you’re working within a tight daily limit.
Keeping Mayo Sodium in Check
- Measure instead of eyeballing. A level tablespoon is smaller than most people think. Using an actual measuring spoon keeps portions honest.
- Compare brands at the store. Sodium can vary by 50 milligrams or more between brands for the same serving size. A few seconds of label reading can save you meaningful sodium over time.
- Make your own. Homemade mayo takes about five minutes with a whisk or immersion blender and lets you control exactly how much salt goes in.
- Watch the full meal, not just the mayo. Average sodium intake in the U.S. runs around 3,400 milligrams per day, well above the 2,300-milligram guideline. Mayo is rarely the biggest contributor, but trimming sodium from every source adds up.