Sodium
Also known as: Sodium chloride, Salt, Electrolyte sodium
The electrolyte everyone gets too much of — essential for nerve and muscle function, with a public-health problem in excess.
In short
Sodium is an essential mineral and electrolyte that maintains fluid balance, drives nerve impulses, and enables muscle contraction. Most Americans get far more than needed — average intake runs around 3,400 mg/day against a 2,300 mg limit — mostly from processed and restaurant food rather than the salt shaker. Excess sodium raises blood pressure in a dose-dependent way and is a major contributor to cardiovascular risk, which is why the FDA has made sodium reduction a public-health priority. Deficiency (hyponatremia) is rare outside of extreme sweating, certain medications, and medical conditions, but it is dangerous when it occurs. Sodium's story is not about taking more — it is about the gap between essential and excessive.
- Essential electrolyte; fluid balance, nerve, and muscle function
- US average intake ~3,400 mg/day vs 2,300 mg recommended limit
- Blood-pressure effects are dose-dependent and well documented
- Deficiency (hyponatremia) is rare but serious
What is Sodium?
Sodium is the rare nutrient whose problem is abundance, not deficiency. Every nerve impulse and muscle contraction depends on it, yet the average American consumes nearly 50% more than the recommended limit — and almost none of that comes from the salt shaker; processed and restaurant food deliver over 70% of intake. The cardiovascular case against excess is among the best-established in nutrition: blood pressure tracks sodium dose, and cutting intake lowers it. Understanding sodium means reading labels, not fearing salt altogether.
Where it comes from
Natural sources
- Present in virtually all foods; abundant in seawater, celery, beets, and milk
- Table salt is 40% sodium by weight
- Also consumed as sodium bicarbonate, citrate, and other salts
How it's made
Refined table salt (often iodized) and dozens of sodium-based food additives.
What it does in products
Benefits
Electrolyte function
strong evidenceSodium is indispensable for nerve conduction, muscle contraction, and blood-volume maintenance — physiology without which the body cannot function.
Blood pressure reduction on lower intake
strong evidenceRandomized trials and meta-analyses (including the DASH-Sodium studies) show sodium reduction lowers blood pressure, with larger effects in sensitive individuals.
Exercise fluid balance
strong evidenceDuring prolonged sweating, sodium replacement prevents hyponatremia and supports hydration — the basis of sports electrolyte products.
Side effects & safety
Safety considerations
- Normal dietary intake is safe and necessary; extreme restriction or excess both carry risks.
- Diuretics and lithium — altered sodium handling; monitor levels
- Corticosteroids — sodium retention may increase
- Not for: Heart failure and kidney disease — sodium restriction is usually prescribed
- Not for: Meniere's disease — low-salt diet commonly advised
How it's used
In supplements
Not supplemented as a general rule. Aim ≤2,300 mg/day (ideal limit 1,500 mg for hypertensives).
In skincare
Used in scrubs (salt crystals) and bath salts; sodium chloride also appears as a viscosity agent.
Regulatory status
- GRAS food ingredient; FDA voluntary sodium-reduction targets for industry (2.5-year and 10-year goals).
- GRAS (generally recognized as safe) for food use.
- INCI name on cosmetic labels: Sodium Chloride.
- Assessed as safe in cosmetics.
Popular products containing Sodium
- Morton Iodized Salt — Iodized table saltMorton · Food
- Liquid I.V. Hydration Multiplier — Electrolyte drink mix with sodiumLiquid I.V. · Supplement
- LMNT Recharge Electrolytes — High-sodium electrolyte mixLMNT · Supplement
Product names and brands are shown for reference and belong to their respective owners.
Where the sodium actually comes from
Over 70% of US dietary sodium arrives pre-added in processed and restaurant food: breads, deli meats, pizza, soups, and sauces dominate. The shaker contributes only about 10%. That is why label-reading and cooking at home — not skipping the shaker — move intake the most.
Salt sensitivity
Blood-pressure response to sodium varies: some people ('salt-sensitive') show large changes, driven by kidney handling, genetics, age, and potassium status. Because there is no practical test, population guidance defaults to moderation — and boosting potassium (fruits, vegetables) blunts sodium's pressure effect.
Frequently asked questions
Is sea salt healthier than table salt?
Nutritionally, no — sodium content is essentially identical. Sea salt may lack iodine and offers only trace minerals. Iodized table salt remains the public-health choice.
Do athletes need extra sodium?
During prolonged (>2-hour) sweaty exercise or hot conditions, yes — roughly 300–600 mg per hour, adjusted for sweat rate. For gym sessions under an hour, water usually suffices.
Can low sodium be dangerous?
Hyponatremia — from extreme fluid intake, endurance events, or medical conditions — is serious. For most people the realistic risk is excess, not deficiency.
The bottom line
Sodium is essential in moderation and harmful in the quantities most Americans actually consume — the practical target is less than 2,300 mg/day, won mostly by cutting processed food, not the salt shaker.
References
- Sodium — Health Professional Fact Sheet. NIH Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Sodium-HealthProfessional/
- Effects on blood pressure of reduced dietary sodium: meta-analysis. BMJ. https://pubmed.ncbi.nlm.nih.gov/23558163/
- Sodium reduction — FDA. U.S. Food and Drug Administration. https://www.fda.gov/food/food-additives-petitions/sodium-reduction