chemistry

Salt substitute

Salt substitute is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Salt substitute rather than just read about it. In short: A salt substitute, also known as low-sodium salt, is an alternative to edible salt (table salt) marketed to reduce the risk of high blood pressure and cardiovascular disease associated with a high intake of sodium chloride while maintaining a similar taste. Salt substitutes most often remove some amount of sodium chloride from the product and replace it with potassium chloride.

Key takeaways

Salt substitute belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Salt substitute to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Salt substitute from memory before moving on to harder problems.

Reference excerpt

A salt substitute, also known as low-sodium salt, is an alternative to edible salt (table salt) marketed to reduce the risk of high blood pressure and cardiovascular disease associated with a high intake of sodium chloride while maintaining a similar taste. Salt substitutes most often remove some amount of sodium chloride from the product and replace it with potassium chloride. Other formulations replace the sodium chloride with herbs, with magnesium sulphate or other substances.

Low sodium diet

Research A 2021 randomised controlled trial of 20,995 older people in China reported that use of a potassium salt substitute in home cooking over a five-year period reduced the risk of stroke by 14%, major cardiovascular events by 13% and all-cause mortality by 12% compared to use of regular table salt. The study reported no significant difference in hyperkalaemia between the two groups, though people with serious kidney disease were excluded from the trial. The salt substitute used was 25% potassium chloride and 75% sodium chloride. A 2022 Cochrane review of 26 trials involving salt substitutes reported their use probably slightly reduces blood pressure, non-fatal stroke, non-fatal acute coronary syndrome and heart disease death in adults compared to use of regular table salt. A separate systematic review and meta-analysis published in the same year of 21 trials involving salt substitutes reported protective effects of salt substitute on total mortality, cardiovascular mortality and cardiovascular events.. The salt substitutes used in the trials captured by these reviews varied in composition. A 2023 clinical trial engaged 1,612 residents of 48 residential care facilities in China. They were cluster-randomized via a 2 × 2 factorial design substituting 62.5% sodium chloride / 25% potassium chloride versus regular table salt and progressively restricted versus usual supply for two years. The salt substitute lowered systolic blood pressure (–7.1 mmHg, 95% confidence interval (CI) –10.5 to –3.8), meeting the primary endpoint, whereas restricted vs usual supply had no effect. It also lowered diastolic blood pressure (–1.9 mmHg, 95% CI –3.6 to –0.2) and resulted in fewer cardiovascular events (hazard ratio (HR) 0.60, 95% CI 0.38–0.96), but had no effect on total mortality. In 2025, the WHO recommended that where people add salt to their food, they use a salt substitute that contains potassium. It said this recommendation applies to adults but not children, pregnant women or those with kidney issues.

Types

Potassium Potassium closely resembles the saltiness of sodium. In practice, potassium chloride (also known as potassium salt) is the most commonly used salt substitute. Its toxicity for a healthy person is approximately equal to that of table salt (the LD50 is about 2.5 g/kg, or approximately 190 g (6.7 oz) for a person weighing 75 kg (165 lb). Potassium lactate may also be used to reduce sodium levels in food products and is commonly used in meat and poultry products. The recommended daily allowance of potassium is higher than that for sodium, yet a typical person consumes less potassium than sodium in a given day. Potassium chloride has a bitter aftertaste when used in higher proportions, which consumers may find unpalatable. As a result, many formulations replace only some of the sodium chloride with potassium. Various diseases and medications may decrease the body's excretion of potassium, thereby increasing the risk of potentially fatal hyperkalemia. People with kidney failure, heart failure, or diabetes are recommended to not use salt substitutes without medical advice.

Other Sodium malate is salty in taste and may be blended with other salt substitutes. Although it contains sodium, the mass fraction is lower. Monosodium glutamate is often used as a substitute for salt in processed and restaurant food, due to its salty taste and low sodium content compared to table salt, and can also be used effectively in home cooking. Seaweed granules are also marketed as alternatives to salt. Dehydrated, pulverized Salicornia (glasswort, marsh samphire) is sold under the brand name "Green Salt" as a salt substitute claimed to be as salty in taste as table salt, but with less sodium.

Historical Historically (late 20th century), many substances containing magnesium and potassium have been tried as salt substitutes. They include:

carnallite (KMgCl3•6H2O) kainite (KCl•MgSO4•2H2O) langbeinite (K2Mg2(SO4)2) sylvite (KCl) – currently used polyhalite (K2MgCa2(SO4)4•2H2O) epsomite (MgSO4·7H2O) kieserite (MgSO4·H2O) Even further back in the early 20th century, lithium chloride was used as a salt substitute for those with hypertension. However, overdosing was common and deaths have occurred, leading to its prohibition in 1949.

Additives Flavor enhancers, although not true salt alternatives, help reduce the use of salt by enhancing the savory flavor (umami). Fish sauce has the same effect. Salt substitutes can also be further enriched with the essential nutrients. A salt substitute can, analogously to the problem of iodine deficiency, help to eliminate the "hidden hunger" i.e. insufficient supply of necessary micronutrients such as iron. Such substances are promoted by UNICEF as a "super-salt".

See also Sugar substitute Milk substitute Egg substitutes

References

Worked examples

Example 1 — a first encounter with Salt substitute

Start with the simplest possible case. Write down what Salt substitute claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Salt substitute before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Salt substitute ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Salt substitute

In research: Salt substitute appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Salt substitute in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Salt substitute is common in secondary-school and first-year university syllabi. It links to neighbouring topics Edible salt, Imitation foods, Potassium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Salt substitute outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Salt substitute in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Salt substitute means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Salt substitute out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Salt substitute in simple terms?

Why does Salt substitute matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Salt substitute?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Salt substitute.