Sodium
EVIDENCE: STRONGAlso sold as: sodium chloride, sea salt, salt, Himalayan salt
Sodium is an essential electrolyte, but most people already get enough from food. In powdered supplements, it commonly forms part of the flavor or drink base rather than an ingredient with an established treatment effect.
Compiled by iSupplementReviews editorial team ·Updated 2026-10-16 · 4 sources
- Type
- Electrolyte mineral
- Studied dose
- N/A — dietary intake dwarfs any supplement dose
- Best form
- n/a — in supplements it's usually sea salt in the base/flavor system
- Upper limit
- US guideline <2,300 mg/day; AHA ideal 1,500 mg/day total
- Our rating
- STRONG — Multiple consistent human trials
What is sodium?
Sodium is an essential electrolyte involved in fluid balance, blood volume, nerves, and muscles. Food supplies it mainly as sodium chloride. In powdered supplements, small amounts often come from sea salt, drink-base ingredients, or processing aids.
The forms that matter
| Form | What it is | Notes |
|---|---|---|
| Sea salt / Himalayan salt | ~98% NaCl + trace minerals | Trace minerals are real but trivial in amount; usually non-iodized |
| Table salt | NaCl, usually iodized | The iodine in iodized salt is a genuine public-health win (1924 goiter campaign) |
| Sodium citrate / bicarbonate | Functional salts | Buffering/flavor agents in powder bases |
Where does it come from?
Overwhelmingly the food supply: bread, processed food, restaurant meals, the salt shaker. Average American intake is ~3,400 mg/day, above every recommended ceiling, which is the entire reason sodium supplementation is almost never needed.
How does sodium work in the body?
It’s the primary extracellular cation: it holds water in the bloodstream (blood volume → blood pressure), carries the nerve-impulse voltage gradient, and drives muscle contraction. Essential and dangerous in excess; the body’s sodium regulation (kidneys, aldosterone, thirst) is among the tightest control systems in physiology.
What is sodium claimed to do?
In supplements: “hydration,” “electrolyte balance,” and trace-mineral marketing around specialty salts. Real for athletes; a solution to an over-solved problem for everyone else.
What does the research show?
| Claim | Evidence | Dose studied | Verdict |
|---|---|---|---|
| Essential for fluid/nerve function | Foundational physiology | dietary | Established |
| Excess raises blood pressure | DASH-Sodium trial (NEJM 2001) | 1,500 vs 2,300 vs 3,300 mg/day | Strong, dose-response |
| Endurance sweat replacement | Sports-medicine consensus | ~500–1,000 mg/L sweat | Supported for athletes |
| Supplement benefits general users | — | — | Not supported |
DASH-Sodium — the landmark
Sacks et al. (2001, NEJM): 412 adults on fully controlled diets showed systolic blood pressure falling stepwise as sodium dropped from 3,300 → 2,300 → 1,500 mg/day: a direct dose-response on real food, in a randomized feeding trial. It established “less sodium, lower pressure” at every step, in both hypertensive and normal participants.
The debate worth knowing
Observational studies disagree about the risks of very low sodium intake. Those associations cannot prove that low intake caused the reported outcomes.
The PURE study (2014) and related analyses complicate the floor: very low intake (<~3 g/day) also tracked with higher cardiovascular events in observational data, a U-shaped curve debate that’s still live. What isn’t debated: the ~3,400 mg average is too high, and nobody’s health problem is too little sodium from a 70 mg supplement line.
What doesn’t sodium do?
In a supplement at tens of milligrams: nothing clinically meaningful in either direction. It’s a rounding error against a 3,400 mg dietary background.
What dose was studied?
There is no therapeutic supplement dose for general users; the literature is about dietary ceilings (2,300/1,500 mg). Electrolyte products for athletes are a different use case (sweat replacement).
Deficiency — who’s at risk?
True deficiency (hyponatremia) is a medical event: endurance overhydration, diuretic use, salt-wasting kidney disease, severe gut losses. Not a supplement-store problem.
Side effects
At supplement doses: none. At dietary levels: chronic excess → hypertension, stroke, cardiovascular disease.
Drug interactions
- Blood-pressure drugs: dietary excess blunts them
- Lithium: sodium changes alter lithium levels (a real, underappreciated interaction)
- Corticosteroids: additive sodium retention
Who should not take sodium supplements?
People with hypertension, heart failure, kidney disease, or on salt restriction, though the tens of milligrams in a powder base rarely changes the calculus.
What the authorities say
AHA: 1,500 mg ideal, 2,300 mg max. CDC/FDA: the ~3,400 mg average intake is a population-level cardiovascular risk. Nobody in authority recommends sodium supplementation for the general public, which is precisely why a sodium line on a supplement label should be read as “base ingredient,” not “benefit.”
What to know about sodium
A small sodium amount is usually part of the drink base rather than an established treatment ingredient. Listing it is useful nutritional disclosure. Consider overall dietary intake instead of treating its presence as a special benefit.
Frequently asked questions about Sodium
Why is sodium listed on a supplement label?
Usually because the formula uses sea salt, electrolytes, or sodium-containing compounds in the powder base: for taste and dissolution, not therapy. A few tens of milligrams is a base ingredient, not a dose.
Is sodium bad for you?
Excess sodium is: high intake raises blood pressure (the DASH-Sodium trial proved the dose-response directly). But sodium is essential: nerve firing, fluid balance, and muscle function fail without it. The problem is the modern diet oversupplies it, not that sodium is toxic.
Who needs sodium supplements?
Endurance athletes losing liters of sweat, people on very-low-carb diets (increased renal sodium loss), and those with diagnosed orthostatic issues or salt-wasting conditions, under guidance. A general-health powder doesn't fill a gap; the diet already over-supplies sodium.
Is sea salt healthier than table salt?
Not meaningfully. Sea salt's 'trace minerals' exist only at very low levels, and unlike iodized table salt it usually lacks iodine (the nutrient whose 1924 fortification eliminated goiter as a public-health problem). Both are ~98% sodium chloride.
How much sodium per day is safe?
US guidelines say under 2,300 mg/day; the American Heart Association's ideal is 1,500 mg. Average American intake is ~3,400 mg: above the ceiling before any supplement enters the picture.
References
- [1]Sacks FM et al. — DASH-Sodium trial: effects on blood pressure of reduced dietary sodium (NEJM, 2001)
- [2]American Heart Association — Sodium and your health / intake recommendations
- [3]CDC — About Sodium and Health (intake, dietary guidelines, food sources)
- [4]O'Donnell M et al. — PURE study: urinary sodium and cardiovascular events (NEJM, 2014)
Products we reviewed containing Sodium
Based on recorded labels or seller-described formulas. Inclusion does not establish a match to the strains, preparations or amounts studied here; check each review's disclosure limits.