Potassium Chloride

About

What it is and where it shows up.

Potassium chloride is an inorganic mineral salt composed of potassium and chloride ions, occurring naturally in many foods and used in the food industry primarily as a low-sodium substitute for table salt, a firming agent, a gelling aid, and a source of the essential mineral potassium. It is widely employed in reduced-sodium processed foods, sports beverages, and infant formula to help maintain electrolyte balance.

Safety summary

The regulatory and scientific consensus.

EFSA's 2019 re-evaluation concluded that chloride exposure from potassium chloride (E508) as a food additive does not raise a safety concern at reported use and use levels, with the panel noting low acute oral toxicity and no concerns regarding genotoxicity or carcinogenicity. A human reference value of 40 mg chloride per kg body weight per day was identified; mean exposures across all age groups were at or below this level, though 95th-percentile estimates in toddlers, children, and adolescents were slightly above it. Individuals with chronic kidney disease (CKD stages 3–5) and those taking potassium-sparing or renally active medications (e.g., ACE inhibitors, potassium-sparing diuretics) face a risk of hyperkalaemia and should exercise caution or seek medical advice.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
FSANZ (Food Standards Australia New Zealand) (Australia)	Approved	Permitted food additive under FSANZ Food Standards Code; INS number 508. No numerical ADI established; use at GMP levels. Permitted in salt and salt products as a sodium chloride substitute.source
EFSA (European Food Safety Authority) (European Union)	Approved	Authorised as E508 in Annex II and III of Regulation (EC) No 1333/2008. EFSA FAF Panel 2019 re-evaluation concluded no safety concern at reported use levels. No numerical ADI set; a human chloride reference value of 40 mg/kg bw/day was used for assessment. Safe and adequate intakes for chloride (from all sources) are 3.1 g/day for adults. Slight exceedance at 95th percentile for toddlers, children, and adolescents noted but not considered a formal safety concern requiring action.source
Food Standards Agency (FSA) / Food Standards Scotland (FSS) (United Kingdom)	Approved	Potassium chloride (E508) is a generally permitted food additive approved for use in most processed foods and can be employed as an ingredient without being subject to further regulation other than general food law. Products containing potassium rather than sodium chloride may carry labelling noting potassium substitutes. COT concluded CKD patients (stages 3–5) and individuals on certain medications represent a vulnerable subgroup requiring caution.source
FSSAI (Food Safety and Standards Authority of India) (India)

Who should approach with care

Whose guidance would steer them away.

Kidney Disease — Patients with CKD stages 3–5 have impaired ability to excrete potassium; increased dietary potassium from salt substitutes containing potassium chloride can lead to hyperkalaemia, a potentially life-threatening condition, as highlighted by the UK COT and WHO guidance.

Heart Disease — Individuals on potassium-sparing diuretics, ACE inhibitors, or angiotensin-receptor blockers commonly prescribed for heart failure and hypertension may accumulate excess potassium when consuming high amounts of potassium chloride, raising hyperkalaemia risk.

Infants — Premature infants and newborns have immature renal potassium-handling capacity; the COT and EFSA note that chloride content in infant formula is tightly regulated (50–160 mg/100 kcal) to avoid imbalance, and excessive potassium chloride outside these limits is inappropriate.

Children — EFSA's 2019 re-evaluation found that 95th-percentile exposure to chloride from potassium chloride and related additives in toddlers, children, and adolescents was slightly above the human reference value of 40 mg chloride/kg bw/day, warranting monitoring of cumulative intake.

Research citations

The sources behind this verdict.

1other. UK COT Statement on Potassium-Based Replacements for Sodium Chloride. cot.food.gov.uk
2FDA. 21 CFR 184.1622 – Potassium Chloride (GRAS Affirmation). ecfr.gov
3FDA. 21 CFR 184.1622 – Potassium Chloride (GRAS Affirmation). accessdata.fda.gov
4WHO. JECFA Food Additive Details – Potassium Chloride (INS 508). apps.who.int
5PubMed. Are Food Additives a Really Problematic Hidden Source of Potassium for Chronic Kidney Disease Patients?. pmc.ncbi.nlm.nih.gov
6EFSA. Re-evaluation of hydrochloric acid (E 507), potassium chloride (E 508), calcium chloride (E 509) and magnesium chloride (E 511) as food additives, 2019. efsa.europa.eu

Independently researched8 citations