The Salt Swap That Could Lower Blood Pressure

High blood pressure affects about 122 million US adults, and most of them still reach for the same white crystals their parents used. A new analysis from the American Heart Association, presented at the 2025 Hypertension Scientific Sessions, found that fewer than 6% of American adults use salt substitutes. Even among people whose blood pressure refuses to come down on medication, usage barely cracks 10%.

Stat: Only 2.5% of US adults reported using a salt substitute in 2017-2020, down from a peak of 5.4% in 2013-2014.

That gap matters. Potassium-enriched salt is cheap, widely available, and tastes close enough to regular salt that most people do not notice at the dinner table. The research team at UT Southwestern called it a "missed opportunity" for stroke and heart attack prevention. So what are these substitutes, who benefits, and who should steer clear?

What a salt substitute actually is

A salt substitute swaps part of the sodium in regular table salt for potassium chloride. Some products remove all the sodium. Others cut it by roughly half. The flavor profile stays salty thanks to the potassium, though it can turn slightly bitter when heated for a long time in soups or sauces.

The appeal is simple biology. Too much sodium pushes blood pressure up by holding extra fluid in the bloodstream. Potassium does the opposite, helping the kidneys flush sodium out and relaxing blood vessel walls. Most people get plenty of sodium and not nearly enough potassium, so the swap nudges both numbers in a better direction at once.

Key Takeaway: Salt substitutes replace sodium with potassium, a mineral most people under-consume. The swap can lower blood pressure without changing the rest of your diet.

Why the AHA study raised eyebrows

The researchers pulled nearly two decades of data from NHANES, the federal nutrition survey, covering 2003 through early 2020. Usage never climbed above 6% in the general population. Among people with untreated high blood pressure, the group arguably with the most to gain, adoption sat under 6% too.

The pattern held across income and education groups. People who ate restaurant meals three or more times a week were slightly less likely to use substitutes at home, which tracks: if most of your sodium comes from takeout and packaged food, a different shaker on the kitchen counter only moves the needle so far. Still, for home cooks and anyone watching a blood pressure cuff, the tool was sitting on the shelf unused.

How much it could help

The AHA recommends capping sodium at 2,300 mg per day, with 1,500 mg as the stretch goal for adults managing hypertension. Cutting intake by 1,000 mg daily is enough to produce a measurable drop in blood pressure for many people. A 2021 trial in rural China, the SSaSS study, found that replacing regular salt with a 75% sodium / 25% potassium blend reduced stroke risk by 14% and cardiovascular death by 13% over five years.

Key Takeaway: Research suggests cutting sodium by about 1,000 mg per day can meaningfully lower blood pressure, and substitutes make that cut easier than willpower alone.

Nobody is claiming a salt swap replaces medication or a broader diet shift. But alongside the usual levers, like eating more fiber, cutting back on ultra-processed food, and paying attention to food quality over macro ratios, it is one of the lowest-effort interventions available.

When to skip the swap

Potassium is not risk-free for everyone. People with reduced kidney function cannot clear excess potassium efficiently, and high blood levels can trigger dangerous heart rhythms. Certain blood pressure medications, including ACE inhibitors, ARBs, and potassium-sparing diuretics, already raise potassium. Stacking a substitute on top can push levels too high.

If you fall into any of these groups, talk to your doctor before switching. A quick blood test shows whether your kidneys can handle the extra potassium, and most clinicians are happy to weigh in since the downside of getting it wrong is real.

Making the switch stick

The honest truth is that most sodium does not live in the salt shaker. It hides in bread, deli meat, canned soup, sauces, cheese, and nearly everything labeled "convenience." A salt substitute helps at home, but pairing it with a quick glance at nutrition labels moves the needle much faster. Aim for products with under 140 mg sodium per serving when you can.

Tracking sodium alongside the usual macros for a couple of weeks is often enough to spot the real culprits. Most people are shocked at how much comes from three or four staple items they eat daily. Once you know where it comes from, small swaps add up, and the salt substitute becomes one tool in the kit rather than the whole strategy.

-- Selena

Sources

• Hardly anyone uses this surprisingly simple blood pressure fix — ScienceDaily / American Heart Association
• Effect of Salt Substitution on Cardiovascular Events and Death (SSaSS trial) — New England Journal of Medicine, 2021
• How much sodium should I eat per day? — American Heart Association

FAQ

What is a salt substitute?

A salt substitute is a seasoning that replaces some or all of the sodium in table salt with potassium chloride. It tastes close to regular salt but reduces sodium intake, which can help lower blood pressure in people who use it regularly at home.

Who should avoid salt substitutes?

Anyone with chronic kidney disease, heart failure, or taking ACE inhibitors, ARBs, or potassium-sparing diuretics should talk to a doctor first. Excess potassium is hard for impaired kidneys to clear and can trigger abnormal heart rhythms at high blood levels.

How much can a salt substitute lower blood pressure?

Clinical trials suggest that swapping regular salt for a potassium-enriched version can cut systolic blood pressure by around 3 to 5 mmHg in adults with hypertension. The 2021 SSaSS trial also reported a 14% reduction in stroke risk over five years.

Does salt substitute taste different?

Most people find the taste similar to regular salt, especially in cold foods or sprinkled at the table. Heating potassium chloride for long periods can bring out a slightly bitter or metallic edge, so chefs often add it at the end of cooking rather than at the start.

Is salt substitute enough on its own?

Probably not. Most sodium in modern diets comes from packaged and restaurant foods, not the home salt shaker. Substitutes help most when combined with reading nutrition labels, cooking more meals from whole ingredients, and tracking sodium intake alongside other macros.