Nobody quits keto because the maths got hard. They quit because it's Thursday and they're eating the same plain chicken for the fourth night running.
Flavour is what makes a diet survivable, and flavour lives in the condiment aisle — which is also where the hidden carbs live. Almost every sauce has sugar in it, most dressings are thickened with starch, and the serving sizes on the panel are frequently a lie you tell yourself. So people give up on sauces entirely and eat sad food until they stop.
You don't have to. A surprising amount of the condiment aisle is genuinely free.
The genuinely near-zero-carb list
Mustard. Yellow, dijon, spicy brown — all essentially free. Mustard is vinegar, mustard seed and salt. It's the most underrated ingredient in low-carb cooking and it belongs in dressings, marinades and rubs, not just on sandwiches you're no longer eating.
Vinegar-based hot sauce. Tabasco, Cholula, Tapatío, Frank's. These are peppers, vinegar and salt. Zero to negligible carbs, and heat does a lot of the work that sugar used to do in making food interesting.
Mayonnaise. Real mayonnaise is oil and egg yolk — it's arguably the most keto condiment there is. Check for added sugar in the sweeter American styles; sugar-free versions exist and are worth seeking out.
Vinegars and oils. White vinegar, rice vinegar, apple cider vinegar, olive oil. Nothing to declare. Vinaigrette you mix yourself is always cleaner than vinaigrette from a bottle.
Soy sauce and Worcestershire. Roughly a gram of carbs per tablespoon. Fine in normal use.
Salt, herbs, spices and most rubs. Free, and the fastest way to make the same protein taste like four different dinners.
Anchovy paste and yeast extract. Both taste alarming on their own and both make a dish taste like it took effort. A small amount of either in a sauce or a braise adds the savoury depth that low-carb food often lacks.
The ones that fool people
Sriracha. The reputation is spicy; the second ingredient is sugar. It's around one gram per teaspoon, which is fine once and adds up fast if it's your default.
Most BBQ rubs. Brown sugar is usually in the top three ingredients, because it's what makes bark. A rub isn't automatically a spice blend — read the label.
Sweet soy and teriyaki. These are soy sauce with sugar added. Regular soy sauce is fine; the sweet versions are not the same product.
Balsamic glaze. Reduced grape must. Delicious, and closer to syrup than to vinegar.
"Light" and "fat-free" dressings. When the fat comes out, something has to replace it, and that something is almost always sugar or starch. The full-fat version is usually the lower-carb one.
Read the serving size, not just the carb number
The most common trap on a label isn't the carb count — it's the serving it's attached to. A sauce declaring one gram per two-tablespoon serving is a different proposition if you actually use a quarter cup. Look at both numbers together, every time.
Build a rack, not a bottle
The practical move is to stop thinking about individual condiments and start thinking about a rack: one acid, one heat, one savoury depth, one fat, one salt blend. Five things, endlessly recombinable, none of them costing you anything against your macros. That's what keeps the food interesting past week three.
Everything above is in our Keto & Low-Carb collection, and we've deliberately left out the ones in the second list. Carb counts do vary by brand and manufacturers reformulate without announcing it, so check the panel on the jar as well as the product page.