Sodium Chloride
Also known as: table salt, NaCl, salt
Randomised trials show that increasing oral sodium intake (capsules of table salt) expands plasma volume and can abolish postexercise hypotension. Low-dose sodium chloride has also been used as an appearance-matched placebo in bicarbonate blinding studies.
Last reviewed: 2026-10-14 · 2 indexed studies
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Overview
Sodium chloride (table salt) is the major dietary source of sodium and is used to modify extracellular fluid volume and electrolyte balance. In clinical trials, manipulating oral sodium intake alters plasma volume and postexercise blood pressure responses.
Mechanism & Function
Mechanism of Action
Sodium is the principal extracellular cation and, when ingested, increases extracellular osmolality and sodium content leading to water retention, plasma volume expansion and changes in vascular load and blood pressure.
Physiological Role
Maintains extracellular fluid volume, influences blood pressure and is essential for nerve and muscle function.
Primary Pathways
Performance / Health Relevance
By expanding plasma volume, higher sodium intake can blunt the normal postexercise drop in blood pressure and therefore modify cardiovascular responses to and after exercise. This may influence recovery-related haemodynamic effects rather than direct muscular performance according to the provided trials.
Evidence Review
No meta-analyses or systematic reviews indexed for this ingredient yet.
Dimensions marked N/A have no indexed evidence of that class. They are shown as unavailable rather than scored.
Compare Sodium Forms
Full comparison8 sodium forms are indexed. Bioavailability, clinical evidence, and best-use cases differ meaningfully between them.
| Form | Evidence |
|---|---|
Sodium ChlorideThis page Sodium chloride is well absorbed orally. | 48/100 |
| Calcium Caseinate DIAAS ≈ 1.18; complete EAA profile. | 78/100 |
| Sodium Bicarbonate Oral ingestion reliably raises blood bicarbonate and pH based on RCTs and meta-analyses | 69/100 |
| Sodium Citrate Rapidly absorbed. Citrate form is better tolerated than sodium bicarbonate with similar buffering effects. | 65/100 |
| Pink Himalayan Salt 100% — fully ionised when dissolved. | 60/100 |
| Boron Not established in the provided abstracts. | 55/100 |
| Sodium Phosphate Not described in the provided abstracts. | 50/100 |
| Hyaluronic Acid Oral bioavailability of intact HA is low; lower-molecular-weight forms are better absorbed. | 35/100 |
Practical Use & Dosage
- Minimum Effective Dose
- Not established for performance benefits; trials manipulated intake by adding ~3900 mg NaCl per day.
- Optimal Range
- Follow population guidance; many trials compared 2300 mg/day baseline with added salt (~3900 mg/day) to increase total intake.
- Upper / Caution Level
- 2300 mg sodium per day is a common recommended limit in public health guidance; higher chronic intake increases cardiovascular risk.
- Timing
- In studies manipulating habitual intake, changes were applied daily for 10 days; single small oral doses have been used as placebos in acute trials.
- Best Format
- Table salt capsules or dissolved in food/liquids.
- Bioavailability
- Sodium chloride is well absorbed orally.
- Absorption Considerations
- Effect on plasma volume depends on total sodium and fluid intake and renal handling; individual responses vary.
Safety & Interactions
Side Effects
- •Raised blood pressure with higher intake
- •Plasma volume expansion
- •Potential fluid retention
Contraindications
- Known uncontrolled hypertension
- Heart failure or fluid-sensitive conditions
- Salt-sensitive individuals
Drug Interactions
- •Diuretics and antihypertensives (may alter fluid and electrolyte balance)
- •Drugs where sodium load is clinically relevant (monitor with clinicians)
Who Should Avoid
- •People with hypertension, heart failure, chronic kidney disease, or on sodium-restricted diets
Monitoring
Monitor blood pressure and signs of fluid overload when increasing sodium intake; follow clinical guidance for people with cardiovascular or renal disease.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Sodium Chloride typically used or indicated?
Sodium Chloride is most commonly used for: Electrolyte replacement, Fluid balance during exercise, Dietary sodium intake manipulation. Maintains extracellular fluid volume, influences blood pressure and is essential for nerve and muscle function.
How does Sodium Chloride work?
Sodium is the principal extracellular cation and, when ingested, increases extracellular osmolality and sodium content leading to water retention, plasma volume expansion and changes in vascular load and blood pressure.
What is the recommended dose of Sodium Chloride?
The optimal range is Follow population guidance; many trials compared 2300 mg/day baseline with added salt (~3900 mg/day) to increase total intake.. with a minimum effective dose of Not established for performance benefits; trials manipulated intake by adding ~3900 mg NaCl per day.. Best taken: In studies manipulating habitual intake, changes were applied daily for 10 days; single small oral doses have been used as placebos in acute trials.. Upper / caution level: 2300 mg sodium per day is a common recommended limit in public health guidance; higher chronic intake increases cardiovascular risk..
What are the side effects of Sodium Chloride?
Reported side effects include: Raised blood pressure with higher intake; Plasma volume expansion; and Potential fluid retention. Monitoring: Monitor blood pressure and signs of fluid overload when increasing sodium intake; follow clinical guidance for people with cardiovascular or renal disease.
Does Sodium Chloride interact with medications?
Known or theoretical interactions: Diuretics and antihypertensives (may alter fluid and electrolyte balance); and Drugs where sodium load is clinically relevant (monitor with clinicians). Always check with a clinician before combining with prescription medication.
Who should avoid Sodium Chloride?
Sodium Chloride is generally not recommended for: People with hypertension, heart failure, chronic kidney disease, or on sodium-restricted diets; Known uncontrolled hypertension; Heart failure or fluid-sensitive conditions; and Salt-sensitive individuals.
How strong is the evidence for Sodium Chloride?
Evidence level: Limited (overall score 48/100), based on 2 indexed studies on SuppIndex.
Research & References (2)
Salt Loading Blunts Central and Peripheral Postexercise Hypotension.
Randomised, double-blind crossover study in 19 healthy adults compared 10 days of a 2300 mg/day sodium diet with added table salt capsules (~3900 mg/day) versus placebo; assessed postexercise blood pressure and plasma volume after cycling.
Efficacy of sodium bicarbonate ingestion strategies for protecting blinding.
Multi-study project including a taste/blinding study where participants consumed 0.3 g·kg-1 NaHCO3 or a low-dose sodium chloride placebo (0.03 g·kg-1) in flavoured solutions; also used small oral sodium chloride doses as a placebo in blinding assessments for bicarbonate trials.
Related Ingredients
Other top-rated ingredients in Hydration Ingredients.
Oral Rehydration Salts
75/100Randomized trials in healthy adults show ORS reduces urine output and increases short-term fluid retention compared with plain water, and promotes greater post-exercise rehydration than water; systematic reviews of treatments for acute diarrhoea list ORS among studied interventions. Evidence supports ORS for short-term replacement of fluid and electrolytes in these contexts.
Sodium Citrate
65/100A tribasic sodium salt of citric acid functioning as both an electrolyte source and systemic alkalizing agent that increases blood bicarbonate concentration and extracellular buffering capacity.
Pink Himalayan Salt
60/100~98% NaCl with trace iron oxide imparting pink colour; trace minerals are too low to be nutritionally significant but salt provides 590 mg sodium/g.
Research Overview
Limited EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/sodium-chloride
SuppIndex. (2026). Sodium Chloride: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/sodium-chloride
Based on 2 indexed studies · Evidence level: Limited.
Goal Ratings
Stack Compatibility
Commonly combined with other electrolytes (potassium, magnesium) in rehydration solutions; may be used as a placebo control in bicarbonate trials.