Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Sodium

MineralSodium atomBest with a meal

Useful mainly for people who are sodium-depleted or losing large amounts through sweat or disease.

Quick decision guide

May help most

people who are sodium-depleted or losing large amounts through sweat or disease

Common dosing range

AI 1,500 mg/day; athletes may need more in heat; therapeutic use is condition-specific

When to expect effects

Hours (acute repletion)

Watch out for

Most people consume too much; excess raises blood pressure and cardiovascular risk

What is it

Sodium is an essential electrolyte that, along with chloride, regulates fluid balance, blood pressure, nerve impulses, and muscle contractions. It is the primary cation of the extracellular fluid and is consumed mainly as sodium chloride (table salt).

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You are losing large amounts of sodium through heavy sweat or illness
You have orthostatic hypotension, POTS, or adrenal insufficiency under medical guidance
You do prolonged endurance exercise in heat

Probably skip if…

You eat a typical processed-food diet (you already get more than enough)
You have hypertension, heart failure, or kidney disease
You are taking lithium without clinician oversight

Evidence at a glance

hyponatremia (low blood sodium)

Strong Evidence
Effect
Corrects the deficit and its symptoms
Best fit
people with documented sodium depletion
Time
Hours

orthostatic hypotension / pots

Limited Evidence
Effect
Helps maintain blood volume and reduce symptoms
Best fit
people with orthostatic intolerance or POTS
Time
Days

endurance exercise (sweat replacement)

Limited Evidence
Effect
Helps prevent exercise-associated hyponatremia and supports fluid balance
Best fit
endurance athletes with high sweat sodium losses, especially in heat
Time
Hours (during exercise)

Evidence for 3 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

hyponatremia (low blood sodium)

Corrects deficiency
Strong Evidence

Sodium is an essential electrolyte, and correcting genuine hyponatremia resolves symptoms ranging from confusion to seizures. This is established physiology and standard clinical care, though severe or rapidly developing hyponatremia must be corrected under medical supervision to avoid harm. It is a deficiency correction, not a general supplement benefit.

Effect size
Corrects the deficit and its symptoms
Time to effect
Hours
Best fit
people with documented sodium depletion
Less likely
people with normal sodium status

Bottom line: Replacing sodium in true depletion is essential and effective, but should be medically guided when severe.

SourceMiller et al., 2023 — PubMedBraun et al., 2015 — PubMed

orthostatic hypotension / pots

Supplement benefit
Limited Evidence

Increased sodium (and fluid) intake expands plasma volume and is commonly recommended to reduce orthostatic symptoms in orthostatic hypotension and POTS. Supporting trials are mostly small, but the approach is widely used clinically. It should be individualized and avoided in those who must restrict sodium.

Effect size
Helps maintain blood volume and reduce symptoms
Time to effect
Days
Best fit
people with orthostatic intolerance or POTS
Less likely
people with hypertension or heart failure

Bottom line: Higher sodium intake can ease orthostatic symptoms in appropriate patients, ideally with clinician guidance.

SourceWilliams et al., 2022 — PubMed

endurance exercise (sweat replacement)

Supplement benefit
Limited Evidence

During prolonged exercise (typically over 60–90 minutes), replacing sodium lost in sweat helps maintain fluid balance and reduces the risk of exercise-associated hyponatremia from drinking plain water in excess. Needs vary widely with sweat rate and heat. Routine high sodium intake is not needed for shorter sessions.

Effect size
Helps prevent exercise-associated hyponatremia and supports fluid balance
Time to effect
Hours (during exercise)
Best fit
endurance athletes with high sweat sodium losses, especially in heat
Less likely
people doing short or low-intensity exercise

Bottom line: Useful for replacing heavy sweat losses in prolonged exercise, but unnecessary for most everyday activity.

SourceBaker et al., 2017 — PMC

How it works

Sodium is rapidly absorbed in the small intestine and circulates in blood and extracellular fluid. Its movement across cell membranes through Na+/K+ ATPase and various co-transporters drives nerve impulses, glucose absorption, amino acid transport, and the gradient required for cells to maintain their volume and excitability. The kidneys are the primary regulator of body sodium content, adjusting excretion to match intake under the control of hormones like aldosterone, antidiuretic hormone, and atrial natriuretic peptide. Sodium also plays a key role in maintaining blood pressure through its effect on plasma volume. While sodium is essential, most adults consume far more than they need, primarily from processed foods, restaurant meals, and condiments. Chronically high intake contributes to hypertension in salt-sensitive individuals.

How to take it

1. Typical dose
Adequate Intake 1,500 mg/day; reduce intake above the 2,300 mg/day risk-reduction level for general health
2. Timing
Naturally with food; athletes take electrolyte fluids before, during, and after prolonged exercise
3. With food
With food and fluids
4. How long to try
Ongoing dietary need; supplemental use is situational

What to track

Blood pressure
Hydration and exercise sweat losses
Symptoms of dizziness or cramping (depletion) or swelling (excess)

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Sodium chloride (table salt)

Universal source of dietary sodium. Iodized versions also provide iodine.

Essentially 100% absorbed; standard dietary form.

Sodium bicarbonate (baking soda)

Used for some sports performance protocols and acute medical situations (acidosis). Provides sodium plus alkalinizing effect.

Well-absorbed; also acts as a buffer.

Sodium citrate

Used in some electrolyte products and to alkalinize urine for certain medical purposes.

Well-absorbed; alkalinizing.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Fluid retentionIncreased blood pressure in salt-sensitive people

Serious risks

  • Hypertension and cardiovascular risk with chronic excess

  • Hypernatremia and dehydration at very high acute doses

Who should avoid it

  • People with hypertension, heart failure, kidney disease, or liver disease (limit intake)
  • People with preeclampsia (monitor intake)

Pregnancy & breastfeeding

Normal dietary sodium is appropriate; those with preeclampsia may need to monitor intake under medical guidance.

Interactions

LithiumMajor

Changes in salt intake alter lithium clearance and can cause dangerous level shifts

Diuretics, ACE inhibitors, ARBsModerate

Affect sodium and fluid balance

NSAIDs and corticosteroidsModerate

Promote sodium retention

Documented interactions

Evidence-graded pair pages with sources, dosing notes, and timing guidance — a complement to the narrative section above.

Warnings (1)

+ lithium

high

Lithium and sodium are handled by the same transporters in the kidney and compete for reabsorption. Eating much less sodium than usual causes the kidneys to hold on to both sodium and lithium, which can push lithium levels up toward toxicity; a sudden large increase in sodium can flush lithium out and drop it below the level needed to control mood. The amount of sodium matters less than keeping it steady.

See all 1 Sodium interaction →

Protocols featuring Sodium

Evidence-backed routines where Sodium plays a role.

Hydration & Electrolytes

recovery

Most people drink enough water but consume far too little sodium relative to their activity level — particularly anyone exercising, low-carb dieting, in a hot climate, or drinking caffeine in volume. The result is "water-logged but mineral-poor" hydration that manifests as headaches, fatigue, muscle cramps, lightheadedness on standing, and poor exercise tolerance. This protocol focuses on the four electrolytes that matter most: sodium, potassium, magnesium, and chloride. Calcium gets a brief mention but is rarely the limiting factor in healthy adults.

Food sources

Table salt (1/4 tsp)

Amount
575 mg
%DV
—

Bread (1 slice)

Amount
100-250 mg
%DV
—

Cheese, processed (1 oz)

Amount
350 mg
%DV
—

Deli ham (2 oz)

Amount
600 mg
%DV
—

Canned soup (1 cup)

Amount
700-900 mg
%DV
—

Pickle (1 spear)

Amount
400 mg
%DV
—

Soy sauce (1 tbsp)

Amount
900 mg
%DV
—

Pizza (1 slice)

Amount
600-800 mg
%DV
—

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

Sodium content per serving (e.g., in electrolyte products)
Balanced electrolyte formulation for athletes
Clear intended use

Be skeptical of…

Everyone needs more salt
Detox or cleanse claims
Energy or performance claims for non-athletes

Frequently asked questions

How much sodium is too much?⌄

The Chronic Disease Risk Reduction intake is 2,300 mg/day. Average U.S. intake is about 3,400 mg. Cutting back from very high intake (especially from processed foods and restaurants) is generally beneficial.

Do I need a sodium supplement?⌄

Almost certainly not, unless you are an endurance athlete in hot conditions, have a medical condition causing low sodium, or are advised by a clinician. The Western diet provides ample sodium.

Are pink salt and sea salt healthier?⌄

Specialty salts contain similar sodium content per gram to table salt. Trace minerals are present in tiny amounts that do not meaningfully affect nutrition. The main practical difference is texture and flavor, not health impact.

Should I take salt tablets for exercise?⌄

For long endurance events in hot weather, sodium replacement is important to prevent hyponatremia and cramps. For typical workouts under 60-90 minutes, a normal post-exercise meal usually suffices.

Does low-sodium always equal heart-healthy?⌄

For people with hypertension or salt sensitivity, reducing sodium often helps. For others, very low sodium intake may not provide additional benefit and could be harmful in some contexts. Individual response varies.

References by claim

hyponatremia (low blood sodium)

Miller et al., 2023 — PubMed (2023) link

Braun et al., 2015 — PubMed (2015) link

orthostatic hypotension / pots

Williams et al., 2022 — PubMed (2022) link

endurance exercise (sweat replacement)

Baker et al., 2017 — PMC (2017) link

Track Sodium with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.