Is chloride the same as chlorine?
No. Chlorine is a reactive gas used, for example, to disinfect water. Chloride is the charged form of the element found in salt and in body fluids, and it is the form the body uses.
Electrolyte
Chloride, salt's other half
Chloride is an electrolyte, eaten mostly as salt (sodium chloride), that helps keep body fluids in balance and is an essential part of stomach juices2.
What chloride does for you.
Fluid balance
Helps keep osmotic balance and the movement of water and solutes between body fluids1.
Stomach acid
Needed to make hydrochloric acid in the stomach, which helps digest protein3.
Acid-base balance
The main negative ion outside cells; it keeps body fluids electrically neutral and helps hold pH steady3.
Carbon dioxide transport
In red blood cells, swapping chloride for bicarbonate helps carry carbon dioxide to the lungs1.
Muscles & nerves
Contributes to normal muscle and nerve activity1.
How your body uses chloride.
Chloride is absorbed efficiently along the small and large intestine, often coupled to sodium, and most of it stays in the fluid outside cells1. The kidneys filter large amounts and reabsorb more than 99%, so urine is the main route out; smaller amounts leave in sweat and stool1.
Foods and other sources.
Table saltSea saltSeaweedRyeTomatoesLettuceCeleryOlives
Foods
| Food and serving | Chloride |
|---|---|
| Table salt, 1 g | about 600 mg |
| Processed meat, cheese, sauces, chips and nuts | over 10 mg per g |
| Unprocessed meat and fish | up to 4 mg per g |
| Cakes and pastries | about 3 mg per g |
| Fruit and vegetables | usually under 1 mg per g |
Most chloride comes from salt added in processing, cooking or at the table, and unprocessed foods contain only small amounts; the processed-food figures are averages from a Dutch study1. Figures from1.
Your daily reference amounts.
The same reference table draws the reference lines on your charts in Ayuvo. Needs differ in pregnancy and breastfeeding, which are not covered here.
| Age | Women | Men | Upper limit |
|---|---|---|---|
| 19–30 | 2,300 mg | 2,300 mg | 3,600 mg |
| 31–50 | 2,300 mg | 2,300 mg | 3,600 mg |
| 51–70 | 2,000 mg | 2,000 mg | 3,600 mg |
| 71+ | 1,800 mg | 1,800 mg | 3,600 mg |
AI (Adequate Intake) is used when there is not enough evidence for an RDA: an amount assumed to be enough. Per day, for adults4.
Upper limit (UL) is the most per day that is unlikely to cause harm. Applies to food, drinks and supplements combined.
Too little, too much.
Signs like these have many possible causes. They are a reason to talk to a clinician, not to self-treat.
Too little
Dietary chloride deficiency is rare1; low levels usually follow large fluid losses from heavy sweating, vomiting or diarrhea, or some diuretic medicines2.
- Weakness
- Lethargy and irritability
- Loss of appetite
- Digestive symptoms
- Metabolic alkalosis
- Poor growth in infants
Too much
Chloride is eaten mostly as sodium chloride, and too much salt is linked with higher blood pressure and fluid build-up in some conditions2.
- Higher blood pressure
- Fluid build-up in heart failure
- Fluid build-up in cirrhosis or kidney disease
- Salt raises blood pressure more than other sodium forms
Remember these five.
- Most chloride comes from salt: each gram of salt carries about 0.6 g of chloride.
- Unprocessed foods contain chloride, but only in small amounts.
- Chloride keeps body fluids and pH in balance and is part of stomach acid.
- Deficiency from diet is rare; heavy sweating, vomiting or diarrhea are more common causes of low levels.
- Eating less salt lowers sodium and chloride intake together.
Questions about chloride.
Can a blood test show how much chloride I eat?
Not really. Blood chloride is often measured as part of an electrolyte panel, but the body keeps it in a tight range, so it says little about intake. Unusual results usually reflect fluid losses, kidney function or acid-base changes rather than diet.
Do salt substitutes contain chloride?
Yes. Many salt substitutes use potassium chloride, so they still provide chloride while replacing some of the sodium with potassium.
Get started
Track chloride in Ayuvo.
Food logging does not estimate chloride, so Ayuvo tracks it from supplements you log in Medications, and from Apple Health on iPhone or Health Connect on Android when another app saves it there. Charts by day, week, month and year use the reference lines from this page, personalised by age and sex where they differ. Free, with no account.
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Sources
Facts on this page come from these sources, checked on the dates shown. Intake numbers come from Ayuvo's shared reference table, which cites the sources marked for them.
- Dietary reference values for chloride (EFSA Panel on Nutrition, Novel Foods and Food Allergens. EFSA Journal, 2019) · European Food Safety Authority (PubMed Central) checked 2026-09-27
- Chloride in diet: MedlinePlus Medical Encyclopedia · MedlinePlus, U.S. National Library of Medicine checked 2026-09-27
- Serum chloride levels in critical illness: the hidden story (Pfortmueller CA et al. Intensive Care Medicine Experimental, 2018) · PubMed Central checked 2026-09-27
- Dietary Reference Intakes tables: Reference values for elements · Health Canada checked 2026-09-27
General information, not medical advice. This guide is for healthy adults and does not cover pregnancy, breastfeeding, children or medical conditions. It cannot diagnose or treat anything. Talk to a clinician before starting high-dose supplements, or if you think you may have too little or too much of a nutrient. Spotted an error? Email us.
Keep reading.
CalciumBuilds bones and teeth, keeps muscles and nerves workingIronCarries oxygen in your blood; heme and plant iron explainedMagnesiumEnzyme helper for energy, muscles, nerves and bonesPotassiumPowers nerve signals and muscle contractions, balances sodiumSodiumBalances body fluids; most comes from packaged foodsZincImmunity, wound healing and taste; watch copper at high dosesVitamin AVision, immunity and growth; from retinol and beta-caroteneVitamin CCollagen, antioxidant defence and plant-iron absorption