Potassium chloride
A mineral salt (KCl) used to replace some table salt (sodium chloride) in foods to lower sodium while keeping a salty taste.
Should I eat Potassium chloride?
This is a highly purified mineral salt made from potash. If you do not need to limit potassium, choosing products that replace some salt with potassium chloride is a practical way to cut sodium and lower cardiovascular risk; avoid it if you have kidney disease or take potassium‑raising drugs.
Summary
Potassium chloride (E508) shows up in many reduced‑sodium foods because it keeps a salty taste while lowering sodium. Randomized trials and reviews link these swaps to fewer strokes and heart events. FDA, EFSA, and JECFA consider food uses safe; the exception is people who cannot handle extra potassium. On U.S. labels it may appear as “potassium chloride” or “potassium salt,” and replacement levels vary, so check both the ingredient list and the sodium number.
Key Research Points
Cuts sodium, fewer strokes
When potassium chloride replaces part of table salt, large randomized trials show lower stroke and major heart events. Serious high‑potassium events did not increase in the screened trial populations.
Avoid if potassium‑restricted
People with chronic kidney disease or on potassium‑raising drugs should not use KCl salt substitutes without medical advice. These groups face dangerous high blood potassium.
Food‑use judged safe by regulators
FDA affirms KCl as a purified mineral salt used in foods. EFSA and JECFA report low toxicity with no genotoxic or cancer concern at typical use levels.
Overview
What is it?
Why is it used?
Origin
Potassium chloride occurs naturally in evaporite deposits formed by the evaporation of ancient seas. Commercial KCl is typically obtained from underground or solution-mined potash ore (sylvinite), dissolved and purified, then recrystallized. Food use expanded as public-health goals shifted toward sodium reduction; by the 2000s–2020s, regulators and health agencies encouraged partial substitution of sodium chloride with potassium salts in many foods.
Process: Dissolve, purify, crystallize, dry, and mill
Steps
Chemicals
Research & Safety
Potential Concerns
The main medical concern is hyperkalemia (high blood potassium) in people who have reduced kidney function or who take medicines that raise potassium. Those individuals should avoid potassium‑salt substitutes unless their clinician says otherwise. For the general population, trials did not find more serious hyperkalemia when salt blends were used, but those studies excluded high‑risk individuals. Very high intakes from supplements (not typical food use) can irritate the stomach. Taste limits also matter: at higher swap‑out levels, some foods pick up a bitter/metallic note.
Potential Benefits
KCl lets manufacturers and home cooks lower sodium while keeping a salty taste and many of salt’s technical roles. It also adds potassium, a nutrient many people under‑consume. Human trials show that using a partial KCl salt blend at home can lower blood pressure and reduce rates of stroke and cardiovascular events. In many products, acceptable taste is often maintained with roughly 10–40% replacement of the sodium chloride portion, depending on the recipe and seasoning. You’ll most often see it in breads, soups, sauces, snacks, and processed meats.
Digestive Effects
At normal food amounts, potassium chloride is generally well tolerated. Large single doses from tablets or concentrated supplements can cause gastrointestinal irritation, nausea, or abdominal discomfort; taking such products with food or diluted can lessen irritation. People with a history of ulcers, strictures, or slow gut transit are more sensitive to pill‑form potassium salts and should avoid them unless prescribed. If you ever experience persistent nausea, vomiting, or severe stomach pain from potassium products, seek medical advice.
Limit Consumption
People with chronic kidney disease, adrenal insufficiency (Addison’s), or severe dehydration, and those on potassium‑sparing diuretics, ACE inhibitors, ARBs, or potassium supplements should avoid KCl‑based salt substitutes unless guided by a clinician. Older adults are more likely to have CKD or be on these medicines, so extra caution is wise. Potassium‑restricted diets (often advised in later‑stage CKD) should watch for KCl in low‑sodium products, which may list it as “potassium chloride” or “potassium salt.” For organic foods in the U.S., KCl is allowed as a nonagricultural ingredient in processed organic products, but crop‑use is restricted—relevant mainly to producers, not consumers.
Fact Sheet
Regulatory Status
ESG & Sustainability
Allergens and Diet
Natural Alternatives
Sea salt + herbs
Potassium-free salt blends
Yeast extract (umami)
Citations
21 CFR §184.1622 Potassium chloride
2025-09-20FDA • eCFR/FDA
Guidance for Industry: Use of an Alternate Name for Potassium Chloride in Food Labeling
2020-12-17FDA • FDA
Re-evaluation of hydrochloric acid (E 507), potassium chloride (E 508), calcium chloride (E 509) and magnesium chloride (E 511) as food additives
2019-07-05Younes M., et al. • EFSA Journal
JECFA database: Potassium chloride (INS 508)
1979-01-01JECFA • FAO/WHO JECFA
Potassium chloride (Group ADI statement for chlorides)
2004-01-01JECFA • JECFA Monographs
GSFA Online – Potassium chloride (Table 3, GMP)
2025-01-01FAO/WHO • Codex GSFA
Salt Substitute and Stroke Study (SSaSS) – Trial Summary
2021-08-29American College of Cardiology • ACC/NEJM trial summary
Potassium-Enriched Salt Substitutes as a Means to Lower Blood Pressure – Review
2020-01-01Greer RC., et al. • Hypertension (AHA)
Low-Salt Flavor Enhancers (KCl cautions for CKD)
2021-01-01NKF • National Kidney Foundation
7 CFR §205.605 Nonagricultural (nonorganic) substances allowed… (Potassium chloride)
2025-04-14USDA • USDA NOP / CFR