A single tablespoon of standard soy sauce contains about 900 mg of sodium, nearly half the World Health Organization’s recommended daily limit of 2,000 mg. The good news: you have several reliable ways to tame that saltiness without losing the deep, savory flavor you’re after.
Dilute It Before It Hits the Pan
The simplest fix is cutting soy sauce with another liquid. A common ratio is 1:1, diluting soy sauce by half with water, broth, or dashi. Plain water works but strips some complexity. Better options include unsalted chicken or vegetable stock, which add body, or dashi made from kombu and bonito, which reinforces the umami you’d otherwise lose. Mirin or rice wine also work well because their mild sweetness offsets saltiness while keeping the flavor in the same culinary family.
If you’re making a dipping sauce or marinade, start by replacing half the soy sauce with your chosen liquid, taste, and adjust. For stir-fries and braises where liquid evaporates and concentrates, you may need to dilute even more generously or add the soy sauce later in cooking so it spends less time reducing.
Use Less Soy Sauce, Then Rebuild the Flavor
Rather than pouring in your usual amount and trying to fix it afterward, use half the soy sauce the recipe calls for and compensate with ingredients that deliver savory depth without sodium. Rice vinegar adds brightness and makes food taste more seasoned with less salt. A squeeze of fresh lime or lemon juice does the same thing. Toasted sesame oil contributes richness in tiny amounts. A pinch of sugar or a splash of mirin rounds out the flavor and counteracts the perception of saltiness on your tongue.
Dried shiitake mushrooms, tomato paste, and fermented bean paste (in small quantities) all amplify umami. Even a teaspoon of nutritional yeast stirred into a sauce can add that savory backbone, letting you cut the soy sauce significantly without the dish tasting flat.
Sweetness and Acid Change How You Taste Salt
Your tongue perceives saltiness relative to other flavors present. Adding a small amount of sugar, honey, or mirin won’t make your dish sweet, but it will make the salt less dominant. This is why teriyaki sauce, which combines soy sauce with sugar and mirin, tastes less salty than straight soy sauce even when the sodium content per tablespoon is similar.
Acid works the same way. A splash of rice vinegar, citrus juice, or even a mild fruit vinegar redirects your palate. The salt is still there, but it shares the stage. Combining both sweet and sour elements with a reduced amount of soy sauce is the most effective approach, because you’re lowering the actual sodium while also shifting the flavor balance.
Thickening Sauces Can Reduce Perceived Saltiness
Thickening a sauce with starch doesn’t remove sodium, but it does change how quickly salt reaches your taste buds. Research published in the Journal of Texture Studies found that starch-thickened liquids delivered less saltiness to the palate compared to thin ones. The starch granules trap sodium in a gel-like structure, slowing its release in your mouth. A cornstarch slurry or arrowroot powder mixed into a soy-based sauce can make it taste noticeably less salty, even at the same sodium concentration. This is especially useful for glazes and dipping sauces where you want rich texture anyway.
Switch to a Lower Sodium Product
If you cook with soy sauce regularly, swapping the bottle itself may be the easiest long-term fix. Reduced-sodium soy sauce typically contains about 25 to 40 percent less sodium than the standard version, and in most cooked dishes the difference in flavor is subtle. Coconut aminos is an even bigger drop: about 90 mg of sodium per teaspoon compared to roughly 280 mg in regular soy sauce. It’s milder and slightly sweeter, which works well in marinades and dressings but can taste too muted in dishes that rely heavily on soy sauce for punch.
Liquid aminos (made from soybeans but through a different process) fall somewhere in between. They taste very similar to soy sauce with moderately less sodium. For any substitute, taste as you go, because each one behaves a little differently when heated.
What Doesn’t Work: The Potato Trick
You’ve probably heard that dropping a raw potato into an over-salted soup will absorb the excess salt. Research from the USDA’s National Agricultural Library shows potatoes do absorb some sodium from cooking water, but the amounts are small. Peeled older potatoes absorbed about 54 mg of sodium per 100 grams, and unpeeled new potatoes took up only 16 mg. That’s a tiny fraction of the sodium in a pot of soup. The potato mostly absorbs salty water, not salt itself, so you’d get the same effect by simply removing a ladle of broth and replacing it with plain water. Skip the potato and dilute directly.
Fixing a Dish That’s Already Too Salty
If you’ve already added too much soy sauce and the dish is done, your options depend on what you’re making. For soups and braises, add more unsalted liquid (water, stock, or coconut milk) until the balance is right, then adjust the other seasonings. For stir-fries, toss in more vegetables, rice, or noodles to spread the sodium across a larger volume of food. Plain steamed rice on the side also dilutes the per-bite saltiness effectively.
For sauces and dressings, whisk in extra oil, citrus juice, or water a teaspoon at a time. A small amount of sugar or honey at this stage can also help. If the sauce becomes too thin, thicken it with a cornstarch slurry. You won’t remove the sodium, but you can bring the dish back into balance so the salt isn’t the only thing you taste.