What Is a Salt Substitute? Potassium Chloride, Sodium and Who Should Be Careful

A lower-sodium salt substitute replaces some or all ordinary sodium chloride with another mineral salt, most often potassium chloride. It can cut the sodium in the shaker. It can also add a substantial dose of potassium, which is why the right answer depends on the person using it, not only the number on the front label.

This page is general food information, not individual medical advice. Anyone with kidney disease, impaired potassium excretion, or medicines or conditions that affect potassium should ask a clinician before using a potassium-containing salt substitute. The World Health Organization's 2025 recommendation is not intended for children or pregnant women.

What replaces the sodium?

Regular table salt is sodium chloride. In the most common substitute, potassium chloride replaces part of it. A product might be a half-and-half blend, a mixture with roughly one-third sodium chloride, or nearly pure potassium chloride. The front may say lite salt, half salt, potassium salt, low-sodium salt or salt alternative. The ingredient statement settles what it is.

The U.S. Food and Drug Administration permits manufacturers, under enforcement discretion, to call potassium chloride potassium salt in an ingredient list. The agency's reason is straightforward: the alternate name may help shoppers understand that the ingredient is being used in place of sodium chloride. It does not change the chemistry or remove the need to read the potassium information.

What does it taste like?

Potassium chloride tastes salty, but at higher replacement levels many people perceive bitterness, a metallic edge or a lingering finish. Commercial products manage that in several ways: keep some sodium chloride in the blend, use acids or savory ingredients to mask the aftertaste, change the crystal shape, or design the mixture for one food rather than every food.

This is why a percentage printed on an ingredient brochure is only a starting point. A substitute that works on the surface of a potato chip may fail in bread, brine or sausage. Salt affects moisture, fermentation, protein behavior and preservation as well as taste. Equal weight is not always equal function.

How much lower is lower sodium?

A jar can contain potassium chloride and still carry a meaningful amount of sodium. Another can be sodium-free and contain much more potassium. Compare the same serving size, and remember that the amount used in cooking can differ when the taste intensity changes.

What WHO recommended in 2025

WHO suggests that adults in the general population who choose to use table salt replace ordinary salt with a lower-sodium substitute containing potassium. The recommendation is conditional, not universal. It sits inside the broader advice to reduce sodium intake and use less salt overall.

The scope matters. WHO excludes people with kidney impairment or other circumstances that could compromise potassium excretion. It also states that the recommendation is not intended for children or pregnant women. In other words, the guideline supports a population-level tool while naming the people for whom that tool may be inappropriate.

Who needs to be careful?

Healthy kidneys normally regulate potassium. When that system is impaired, potassium can build in the blood. Some medicines and medical conditions can also change potassium handling. The package warning is not decorative fine print: a potassium-based product can be a fundamentally different ingredient from ordinary salt.

• Check the ingredient statement for potassium chloride or potassium salt.
• Check potassium per serving, not only sodium.
• Do not assume a product is appropriate because it is marketed as heart-smart or lite.
• If a clinician has told you to limit potassium, do not make the swap without asking.
• Keep substitute salt distinct from curing salts, which contain nitrite or nitrate and have exact use rates.

Is sea salt a salt substitute?

No. Sea salt, kosher salt, Himalayan salt and table salt are all ordinarily dominated by sodium chloride. Their grain size, origin and trace components may differ, but changing from one to another does not perform the chemical substitution discussed here. If the label does not list potassium chloride or another sodium replacement, it is not a lower-sodium salt substitute.

Grain shape can change how much fits in a teaspoon, which is why a teaspoon of airy flakes may weigh less than a teaspoon of dense fine salt. That is a volume effect. Potassium chloride is an ingredient effect. The two should not be confused.

Where this leaves iodization

Reducing sodium and maintaining iodine nutrition are compatible, but they are separate questions. WHO recommends iodized food-grade salt and notes that iodization programs can adjust iodine concentration as average salt intake falls. A lower-sodium substitute is not automatically iodized. The label needs to say so.

The practical answer is less exciting than the marketing: use less salt where you can, compare the measured sodium and potassium where you cannot, and treat potassium-based substitutes as a real formulation change rather than a guilt-free version of the same shaker.