Is Sodium Citrate Good for You? Benefits and Risks

Sodium citrate is generally safe and even beneficial in specific medical and dietary contexts, but whether it is “good for you” depends entirely on why you are using it and how much you consume. As a prescription treatment, it helps prevent kidney stones, corrects dangerous acid buildup in chronic kidney disease, and neutralizes stomach acid before surgery. As a food additive, it shows up in processed cheese, soft drinks, and packaged foods, where it contributes to your daily sodium intake without offering therapeutic benefit. The compound is not inherently harmful, but it is not a health supplement either, and in certain situations it carries real risks.

What Sodium Citrate Actually Is

Sodium citrate is the sodium salt of citric acid, the same organic acid found naturally in lemons and other citrus fruits. In the body, citrate plays a role in basic energy metabolism and helps regulate the acidity of urine and blood. When you take sodium citrate by mouth, it gets absorbed and metabolized into bicarbonate, which is the body’s main acid-buffering molecule. That simple conversion is the basis for nearly all of its medical uses. It raises the pH of your blood and urine, making both slightly more alkaline.

You will encounter sodium citrate in three broad contexts: as a prescribed medication for conditions like kidney stones or metabolic acidosis, as a food additive (labeled E331 in Europe) used to control texture and acidity in processed foods, and as an anticoagulant in blood banking and laboratory medicine. Sodium citrate has been used to prevent blood from clotting in stored blood products for over a century, working by binding calcium ions that clotting reactions need.

Kidney Stones and Urinary Health

The strongest evidence for sodium citrate as a therapeutic agent involves calcium-containing kidney stones, which account for the majority of all kidney stones. Citrate in the urine acts as a natural inhibitor of stone formation. It binds to calcium, preventing calcium from crystallizing with oxalate or phosphate into the hard deposits that cause so much pain. When you take sodium citrate, your urinary citrate levels rise, your urine becomes less acidic, and the chemical conditions that favor stone growth shift in your favor.¹

In a randomized, placebo-controlled trial, patients taking a sodium citrate preparation showed increased urinary citrate, decreased urinary calcium and oxalate, and reduced supersaturation of both calcium oxalate and uric acid. Crystallization of calcium oxalate was directly inhibited.² Lab work has also shown that sodium-potassium citrate can stop new calcium oxalate crystals from depositing onto stone fragments left behind after shock wave lithotripsy, the procedure used to break up large stones. The inhibition was dose-dependent, meaning more citrate produced more protection.³

If you have had calcium oxalate kidney stones and your doctor finds that your urinary citrate is low, citrate therapy is one of the standard approaches. Potassium citrate is more commonly prescribed than sodium citrate for this purpose, partly because the extra sodium in sodium citrate can increase calcium excretion in the urine and partly because many stone-formers already consume too much sodium. But sodium citrate remains a valid option, especially when potassium intake needs to be limited.

Chronic Kidney Disease and Metabolic Acidosis

People with chronic kidney disease (CKD) often develop metabolic acidosis because their kidneys can no longer excrete enough acid. This acid buildup accelerates further kidney damage, creating a vicious cycle. Sodium citrate, once metabolized to bicarbonate, helps correct this by raising blood bicarbonate levels back toward normal.

A randomized controlled trial comparing sodium citrate with sodium bicarbonate in CKD patients found that both raised serum bicarbonate by roughly the same amount, about 6 mmol/L, with no meaningful difference between the two treatments.⁴ The practical takeaway is that sodium citrate works just as well as the more commonly used sodium bicarbonate for this purpose.

Beyond just correcting acid levels, treating metabolic acidosis with sodium citrate appears to slow the rate at which kidney function declines. In one study, patients treated with oral sodium citrate lost kidney function at a rate of about 1.6 mL/min per year, compared to roughly 3.8 mL/min per year in patients who received no treatment. Treatment also lowered markers of kidney injury in the urine.⁵ That kind of difference matters enormously over years, potentially delaying dialysis.

Oral Rehydration and Diarrheal Disease

Severe diarrhea, especially in children and in developing countries, causes dehydration and metabolic acidosis. The World Health Organization’s oral rehydration solution traditionally uses sodium bicarbonate as its alkalizing agent, but sodium citrate has been tested as an alternative because it is more chemically stable in hot climates and has a longer shelf life when pre-mixed. A clinical trial found that a citrate-based oral rehydration solution was just as effective as the standard WHO formula at rehydrating patients and correcting acidosis, with no significant differences in fluid intake, output, weight gain, or recovery time over 48 hours.⁶

Stomach Acid Neutralization Before Surgery

One of the more specialized medical uses of sodium citrate is as a pre-surgical antacid. When patients undergo general anesthesia, especially during cesarean deliveries, there is a risk of aspirating stomach contents into the lungs. If those contents are highly acidic, the result can be severe chemical pneumonia. Drinking a dose of 0.3 molar sodium citrate shortly before anesthesia raises the stomach’s pH above the danger zone. The American Society of Anesthesiologists recommends administering a nonparticulate antacid like sodium citrate before cesarean delivery under general anesthesia, though the window of protection is short, with a median duration of about 30 minutes.⁷

Unlike particulate antacids such as aluminum hydroxide, sodium citrate dissolves completely in liquid, so even if a small amount is aspirated it does not cause the lung damage that solid antacid particles can. This is why it is the preferred choice in obstetric anesthesia.⁸

Athletic Performance and Buffering

Sodium citrate has drawn interest from athletes and sports scientists because of its ability to buffer lactic acid. During high-intensity exercise, hydrogen ions accumulate in your muscles and blood, contributing to the burning fatigue that forces you to slow down. By raising blood bicarbonate levels before exercise, sodium citrate theoretically gives your body more capacity to neutralize that acid and keep going longer.

A double-blind, placebo-controlled crossover study of elite fitness challenge athletes found that sodium citrate supplementation improved performance across all six tested events, with moderate to large effect sizes. Post-exercise lactate levels were also lower in the sodium citrate condition compared to placebo.⁹ That is an encouraging result, but the picture gets more complicated when sodium citrate is compared head-to-head with its better-known competitor, sodium bicarbonate (baking soda).

A study in highly trained female CrossFit athletes compared the two supplements at the same dose (0.3 grams per kilogram of body weight). Sodium bicarbonate produced a substantially higher rise in blood bicarbonate and translated into faster performance times. Sodium citrate, at the same dose, did not produce a statistically significant improvement over placebo.¹⁰ The reason is straightforward: gram for gram, sodium bicarbonate delivers more buffering power than sodium citrate does. To get the same degree of alkalosis from sodium citrate, you would need a larger dose.

So why would anyone choose sodium citrate over bicarbonate? The main argument is gastrointestinal comfort. Sodium bicarbonate is notorious for causing bloating, nausea, and diarrhea in many athletes. Research comparing gut symptoms between the two found that average GI symptom scores were lower with sodium citrate than with bicarbonate at equivalent doses.¹¹ Another study found the severity profiles were broadly similar between the two supplements, but the peak GI discomfort came later with sodium citrate, which can be easier to manage around competition timing.¹² For athletes who cannot tolerate baking soda, sodium citrate offers a gentler alternative with a real if somewhat smaller performance benefit.

Sodium Citrate in Food

Outside of medicine and sports, sodium citrate is most commonly encountered as a food additive. It serves several functions in food processing. In processed cheese, trisodium citrate acts as an emulsifying salt: it pulls calcium away from the protein structure in cheese, allowing the casein to disperse evenly and creating the smooth, meltable texture you expect from American cheese slices or cheese sauces. Research has shown that increasing the concentration of trisodium citrate improves fat emulsification and casein dispersion during cooking, producing a firmer, more uniform product.¹³

In molecular gastronomy, sodium citrate enables the sodium alginate spherification technique used to create those dramatic “caviar” pearls and liquid-filled spheres you see in high-end restaurants. By chelating calcium in the liquid being spherified, it prevents premature gelling and allows the cook to control the process.¹⁴

Beyond cheese and avant-garde cooking, you will find sodium citrate listed on the ingredient labels of sodas, flavored waters, ice cream, jams, gelatin desserts, and many canned foods. In these products it adjusts acidity, stabilizes colors, and acts as a preservative. The amounts in individual servings are small, but they add up across a diet heavy in processed food.

The Sodium Problem

Every gram of sodium citrate contains roughly 260 milligrams of sodium. For someone taking therapeutic doses for kidney stones or CKD, this extra sodium load is medically monitored and factored into their overall management. But in the broader food supply, sodium citrate is just one of many sodium-containing additives that collectively push dietary sodium intake well above recommended levels.

A study measuring the sodium content of processed versus minimally processed diets found that food additives contributed an average of about 1,330 milligrams of additional sodium per day, representing a roughly 60% increase in total sodium content.¹⁵ Sodium citrate is one contributor among many, including sodium phosphate, monosodium glutamate, and sodium benzoate. The health consequences of excessive sodium intake are well established: higher blood pressure, greater cardiovascular risk, and increased strain on the kidneys. If you have hypertension or heart failure, the sodium in sodium citrate is just as relevant as the sodium in table salt.

Gastrointestinal Side Effects

When taken as a supplement or medication, sodium citrate can cause GI symptoms, though they tend to be mild. A study that tested different ingestion periods for sodium citrate found that the most common complaints were nausea and sickness. Average GI symptom ratings stayed low across all conditions tested, never exceeding a score of about 1.2 out of a possible 40 at any measurement point.¹⁶ For most people, spreading the dose over a longer period and taking it with food reduces discomfort further. The GI profile is milder than that of sodium bicarbonate, which is one reason athletes sometimes prefer citrate.

Citrate Toxicity in Medical Settings

The most serious risks associated with sodium citrate arise not from pills or food but from massive exposure during blood transfusions and apheresis procedures. All stored blood products are preserved with citrate-based anticoagulants. During massive transfusion, such as after a traumatic hemorrhage, the patient receives large volumes of citrated blood products in a short period. The flood of citrate can overwhelm the liver’s ability to metabolize it, binding so much calcium in the bloodstream that dangerous hypocalcemia develops. This citrate-induced hypocalcemia is associated with increased mortality in trauma patients.¹⁷

Even in smaller-scale procedures like apheresis, where blood is withdrawn, processed, and returned to the donor, citrate toxicity can occur if the anticoagulant infusion rate is too high. Symptoms range from tingling around the lips and fingers to muscle cramps, and in rare equipment malfunction scenarios, life-threatening hypocalcemia and seizures have been reported.¹⁸ These risks are managed in clinical settings by monitoring calcium levels and supplementing calcium as needed, but they underscore that citrate is not biologically inert at high doses.

A Dangerous Interaction With Aluminum

One of the lesser-known but more alarming risks of sodium citrate involves its interaction with aluminum-containing medications. Citrate dramatically increases the absorption of aluminum from the gut. Normally, very little aluminum from an antacid like aluminum hydroxide gets into your bloodstream. But when citrate is present, it opens tight junctions between intestinal cells and creates a highly absorbable aluminum-citrate complex. Studies in rats demonstrated that this enhanced absorption occurs in the upper small intestine via a paracellular pathway, meaning between cells rather than through them.¹⁹

The clinical consequences were documented in a case series of women with kidney failure who received both oral citrate and aluminum hydroxide gel. They developed rapidly progressive brain damage, with confusion, seizures, coma, and death. Blood aluminum levels in these patients far exceeded what is seen even in chronic aluminum toxicity.²⁰ The patients most at risk are those with impaired kidney function, because they cannot clear the excess aluminum. This interaction is now well recognized in nephrology, and the combination of citrate with aluminum-containing products is generally avoided. But over-the-counter aluminum-containing antacids are still widely available, and a person self-treating with both products simultaneously could be at risk without realizing it.

What Animal Studies Suggest About the Gut

Emerging animal research has raised preliminary questions about what happens when citrate consumption goes well beyond normal dietary levels. A mouse study found that enhanced citrate consumption increased gut permeability and shifted the gut microbiome toward a profile associated with obesity, with reduced microbial diversity and changes in bacterial populations.²¹ Another study in mice exposed to sodium citrate after weaning found lasting, sex-dependent changes in social behavior and significant shifts in gut microbial diversity.²²

These findings are worth knowing about but need heavy caveats. Both studies used doses and exposure durations that do not translate directly to human dietary intake from processed food. Mouse gut physiology, microbiome composition, and developmental timelines differ substantially from humans. No human studies have replicated these findings. They represent early signals that high chronic citrate exposure might affect gut health in ways we do not yet understand, not evidence that the sodium citrate in your cheese is harming your intestines.

Who Should Be Cautious

For most healthy people, the sodium citrate encountered in food is not a health concern, and medical use under a doctor’s supervision carries a well-understood risk-benefit profile. But several groups should pay closer attention:

People with kidney disease: While sodium citrate treats metabolic acidosis in CKD, the sodium load can worsen fluid retention and hypertension. Dosing must be carefully calibrated, and it should never be combined with aluminum-containing products.
People with heart failure or hypertension: The sodium content matters. If you are on a sodium-restricted diet, sodium citrate in supplements or heavily processed foods adds to your total load just like any other sodium source.
Patients on aluminum-containing medications: The citrate-aluminum interaction is potentially fatal in people with kidney impairment and should be avoided entirely. Even people with normal kidneys should not take the two together without medical guidance.
Athletes self-dosing for performance: GI symptoms are usually mild, but individual responses vary widely. Trying sodium citrate in training before using it in competition is standard advice. The effective dose is typically 0.3 to 0.5 grams per kilogram of body weight, which for a 70-kilogram person amounts to 21 to 35 grams, delivering a substantial sodium hit that also needs to be factored into your hydration strategy.

Sodium citrate occupies an unusual space as a compound that is both a legitimate medicine and a ubiquitous food additive. In the right context, it prevents kidney stones, protects kidney function, and saves lives during surgery. In the wrong context, or at the wrong dose, it can contribute to sodium overload or interact dangerously with other substances. The question is not really whether sodium citrate is “good” or “bad” but whether the amount you are exposed to, and the reason for that exposure, makes sense for your particular body and situation.