Salt Substitutes and Blood Pressure: Who Should Use Them, and Who Shouldn't

The salt shaker is the easy villain. It sits on the table, it is white, and when a doctor says "cut back on sodium," it is the first thing most of us look at. So we move it to a high shelf, feel virtuous for a week, and then discover that the soup we had for lunch contained more sodium than we could have shaken out in a month.

That small disappointment is the right place to start, because the newest advice about salt substitutes only makes sense once you know where your sodium actually comes from, and who can safely swap it out.

What the big trial found

The study that changed the conversation was the Salt Substitute and Stroke Study, published in the New England Journal of Medicine in 2021. It followed roughly 21,000 people across about 600 villages in rural China, all of whom had either a previous stroke or high blood pressure at age 60 or older. Half of the villages kept using ordinary salt. The other half used a substitute made of about 75 percent sodium chloride and 25 percent potassium chloride.

After nearly five years, the substitute group had about 14 percent fewer strokes and about 12 percent fewer deaths. Those are large numbers for something as undramatic as a different kind of salt.

In 2025 the World Health Organization turned this body of evidence into a guideline. It suggests that adults who use table salt switch to a lower-sodium, potassium-enriched substitute. The wording is worth reading carefully, though. The recommendation is conditional, not strong, because the overall certainty of the evidence was rated low. It is aimed at the general adult population, and it explicitly does not apply to people with kidney impairment or anything else that makes it hard to excrete potassium.

How potassium-enriched salt works

It is a double move. You take in less sodium, which is the part of salt that pushes blood pressure up in many people. And you take in more potassium, which helps the kidneys shed sodium and relaxes blood vessel walls. Most of us eat too little potassium to begin with, so the swap pulls in two directions at once.

Recent pooled analyses of the trials put the effect on systolic blood pressure at somewhere around 4 to 6 mmHg, depending on which studies are included and who was in them. People who already had hypertension tended to see more benefit than people with normal pressure. A drop of five points will not make anyone's chart look like a different person's, but across a whole population it is the size of effect that shows up as strokes that do not happen.

One honest caution about those studies: the largest trial took place where most salt is added at the stove and the table. That matters for the next section.

Where sodium really comes from

In the United States, more than 70 percent of the sodium we eat comes from packaged and restaurant food, not from the shaker. The average American adult takes in roughly 3,400 mg of sodium a day. The Dietary Guidelines for Americans set the ceiling at 2,300 mg, which is about one level teaspoon of table salt, and the WHO's own target is lower, under 2,000 mg.

So a salt substitute helps with the part you control: the pot of dal, the eggs, the roasted vegetables, the pinch at the table. It does nothing for the bread, the canned beans, the deli turkey, the jarred sauce, the frozen dinner, or the restaurant plate. The WHO guideline says as much. It does not cover the salt added in factories and kitchens you do not run.

I think this is why the shaker feels so important and matters so little. It is the only sodium we can see.

Who should talk to a clinician first

This is the part I would not skip, and it is the reason the swap is not for everyone. Potassium chloride is not harmless in the wrong body. If your kidneys cannot clear potassium, it builds up in the blood, and high potassium can disturb the heart's rhythm, sometimes without warning symptoms.

Talk to your doctor or pharmacist before using a salt substitute if any of these apply:

You have advanced chronic kidney disease, or have been told your potassium runs high.
You take an ACE inhibitor or an ARB (common blood pressure medicines), a potassium-sparing diuretic such as spironolactone, or potassium supplements. All of these push potassium up.
You have heart failure, adrenal problems, or any condition for which your care team monitors potassium.
Someone else in your household who eats from the same pot has any of the above. A shared kitchen means shared salt.

The fact that so many people with high blood pressure are on exactly those medicines is the reason this advice is more complicated than "buy the blue can." A quick blood test can settle it. It is a five-minute conversation that can prevent a very bad week.

Cutting sodium without bland food

The first time I tried to cook with less salt, the food tasted like it had been politely excused from the table. What I learned afterwards is that salt is only one of several ways to make food taste finished.

Acid. A squeeze of lemon or lime at the end, or a splash of vinegar, wakes up flavors the way salt does.
Heat and toasting. Dry-roast spices before you grind them. Brown onions properly. Char a vegetable. Browning builds savory depth with no sodium at all.
Aromatics. Garlic, ginger, fresh herbs, curry leaves and chiles carry a lot of flavor per gram.
Umami from whole foods. Tomatoes, mushrooms, and a little Parmesan do more than they have any right to.
Salt last. If you do salt, do it at the end, on the surface, where your tongue meets it first. You will use less.

Taste buds also adjust. Give it two or three weeks of eating a bit less salt and ordinary restaurant food starts to taste aggressive. That shift is real, and it is the closest thing to a free lunch in this whole subject.

A one-week sodium audit

Before you buy anything, find out where your sodium goes. This takes about ten minutes a day, and it is the most useful thing in this article.

Pick one ordinary week. Not a vacation, not a diet reset.
Keep a running list of everything you eat, in your phone notes if that is easiest. Include sauces and drinks.
Read the Nutrition Facts line for sodium on anything packaged. As a rule of thumb, 5 percent of the Daily Value or less per serving is low, and 20 percent or more is high.
Write a number next to each item. For restaurant meals, most chains publish their sodium online. Use it, or estimate on the high side.
Add up each day. Aim to see a pattern, not to be exact.
Circle the top three repeat offenders. They are usually bread, a sauce or condiment, and a lunch meat or soup. Those are your real targets.

Most people find two or three surprises in the first week. A breakfast cereal or a bottled salad dressing is a common one, something nobody ever thought of as a sodium source.

A practical swap list

Canned beans and vegetables: buy no-salt-added, or drain and rinse (rinsing removes roughly a third of the sodium).
Broth and stock: choose low-sodium versions, then season it yourself.
Soy sauce and bottled sauces: use the reduced-sodium kind and use less of it, or finish with citrus instead.
Deli meat and bacon: swap in home-cooked chicken, eggs, or canned fish packed in water.
Bread: compare labels between brands, since sodium per slice varies a lot.
Seasoning blends: many are mostly salt, so look for the no-salt versions or make your own.
Table salt: if your clinician says you are a good candidate, a potassium-enriched substitute at the table and in home cooking. Follow the package directions, and start with a small amount, because potassium chloride can taste slightly bitter or metallic.

FAQ

Are salt substitutes safe for everyone?

No. People with advanced kidney disease, a history of high potassium, or those taking medicines that raise potassium should speak to a clinician before using one. For most healthy adults the products are considered safe in normal amounts.

Do salt substitutes taste different?

Slightly. Potassium chloride can have a mild bitter or metallic edge, especially in high-potassium blends. Mixing a substitute half and half with regular salt, or adding it near the end of cooking, helps while you adjust.

Will switching salts lower my blood pressure on its own?

It may help by a few points, but the overall effect depends on the rest of your diet. Since most sodium comes from packaged and restaurant food, the swap works best alongside reading labels and cooking more at home.

Is sea salt or pink salt a better choice?

Not for blood pressure. They contain about as much sodium as table salt by weight. The difference is mostly in minerals present in trace amounts, and in price.