What does Sodium Citrate do?

A sodium salt used as an alkalizing agent. Modest evidence for buffering in exercise; better studied for kidney disease.

Is Sodium Citrate safe?

Contains significant sodium — problematic for people with kidney disease, heart failure, or hypertension who need to restrict sodium intake

Sodium Citrate - Science-Based Research

What the Science Says

Sodium citrate is a sodium salt of citric acid that acts as an alkalizing agent — it raises the pH of blood and urine. In sports contexts, it is taken before high-intensity exercise to buffer lactic acid buildup, though clinical trials suggest it is less effective than sodium bicarbonate for this purpose. In kidney disease, it has been studied as a treatment for metabolic acidosis, where it performs comparably to sodium bicarbonate at correcting low bicarbonate levels, and a potassium citrate/sodium citrate combination has shown promise in reducing urinary oxidative stress markers in mild-stage chronic kidney disease.

What It Doesn't Do

Won't meaningfully boost exercise performance on its own — sodium bicarbonate outperforms it in head-to-head trials. Not a muscle builder or recovery supplement. No evidence it burns fat or improves body composition. Combining it with sodium bicarbonate doesn't appear to add extra benefit over sodium bicarbonate alone.

Evidence-Based Benefits

Sodium citrate is a sodium salt of citric acid that acts as an alkalizing agent — it raises the pH of blood and urine. In sports contexts, it is taken before high-intensity exercise to buffer lactic acid buildup, though clinical trials suggest it is less effective than sodium bicarbonate for this purpose. In kidney disease, it has been studied as a treatment for metabolic acidosis, where it performs comparably to sodium bicarbonate at correcting low bicarbonate levels, and a potassium citrate/sodium citrate combination has shown promise in reducing urinary oxidative stress markers in mild-stage chronic kidney disease.

Moderate Evidence

Effective at: 0.3 g/kg body weight for exercise buffering; variable for medical uses

Source: auto-research

Absorption & Bioavailability

Good — sodium citrate is rapidly absorbed orally and metabolized to bicarbonate, raising systemic pH. However, its blood buffering effect is weaker and shorter-lived than sodium bicarbonate at equivalent doses.

Red Flags to Watch For

Contains significant sodium — problematic for people with kidney disease, heart failure, or hypertension who need to restrict sodium intake
High doses can cause gastrointestinal discomfort; enteric-coated formulations are used in studies to reduce GI side effects
Can alter electrolyte balance (calcium, potassium, sodium) — relevant for people on medications or with medical conditions
Used as an anticoagulant in dialysis circuits — medical-grade use is very different from supplement use; do not conflate the two
Intrathecal (spinal) use of citrate excipients has raised neurotoxicity concerns in drug delivery research — not applicable to oral supplements but highlights that route of administration matters