Electrolytes

Do electrolytes prevent muscle cramps?

Updated 9 Nov 2026

Short answer

The evidence is weak. A 2026 review of 9 studies in 11,274 athletes found no consistent link between cramps and hydration; a past cramp was the strongest risk factor.[1] In two small lab trials, electrolyte drinks made cramps harder to trigger.[2][3] Magnesium is unlikely to prevent night cramps in older adults.[4]

What the studies found

A 2026 meta-analysis followed athletes in 9 studies with 11,274 people.[1]

  • A past cramp was the strongest risk factor: about 4.4 times higher odds of another one.[1]
  • People with cramps had higher blood potassium and magnesium after the race, not lower.[1]
  • Hydration showed no consistent link with cramps.[1]

Two small lab trials triggered cramps with an electrical current to the nerve. The higher the frequency needed to trigger a cramp, the harder it is to cramp.[2][3]

  • 10 men ran downhill at 35 to 36 °C and lost 1.5% to 2% of body weight. When they replaced it with spring water, the cramp threshold fell by 3.8 to 4.5 Hz. With an oral rehydration solution, it rose by 6.5 to 13.6 Hz.[2]
  • 9 cramp-prone people who were not dehydrated drank an electrolyte drink with 840 mg of sodium, 320 mg of potassium and 5 mg of magnesium. Their threshold was 14.86 Hz, against 14.00 Hz with a dummy drink, and pain was 2.0 against 2.7 points. The drink did not stop cramps in anyone.[3]

Pickle juice

  • In dehydrated men, about 74 mL of pickle juice made a lab-induced cramp 49 seconds shorter than water (85 against 134 seconds). Blood levels did not change within 5 minutes, so the authors suspect a reflex from the mouth and throat, not a refill of salts.[5]
  • In 74 adults with cirrhosis, sips of pickle juice at the start of a cramp were tested for 28 days. Cramp severity fell by 2.25 points on a 0 to 10 scale, against 0.36 with tap water.[6]

Magnesium

A Cochrane review of 11 trials with 735 people found that magnesium is unlikely to prevent cramps in older adults with night cramps. It found no trial of magnesium for exercise cramps.[4] As magnesium deficiency gets worse, it can cause cramps, but symptoms of deficiency are uncommon in healthy people.[7]

Why it might work

  1. Nerves and muscles need the difference in sodium and potassium across the cell membrane to work.[8]
  2. In the downhill running trial, blood sodium and chloride fell by less than 2%, and only when the men drank plain water.[2]
  3. In the pickle juice lab study, the effect came too fast to come from salts in the blood.[5]

Who should be careful

People with kidney disease, liver disease or heart failure have a higher risk of too much potassium in the blood. They should ask a doctor before they take potassium.[8]

What is still unknown

The lab trials had 9 and 10 people and used cramps triggered by an electrical current.[2][3] The 2026 review rated most of its findings as limited or very limited evidence.[1]

Sources (8)

  1. Risk Factors for Exercise-Associated Muscle Cramps: A Systematic Review With Meta-Analysis. Costa LDS, Correa VAF, de Oliveira VF, Jahn AJS, Aliano GB, Nunes GS Muscle Nerve, 2026. PMID 42693659
  2. Effect of oral rehydration solution versus spring water intake during exercise in the heat on muscle cramp susceptibility of young men. Lau WY, Kato H, Nosaka K J Int Soc Sports Nutr, 2021. PMID 33722257
  3. Electrolyte beverage consumption alters electrically induced cramping threshold. Earp JE, Stearns RL, Stranieri A, Agostinucci J, Lepley AS, Matson T, et al. Muscle Nerve, 2019. PMID 31350753
  4. Magnesium for skeletal muscle cramps. Garrison SR, Korownyk CS, Kolber MR, Allan GM, Musini VM, Sekhon RK, et al. Cochrane Database Syst Rev, 2020. PMID 32956536
  5. Reflex inhibition of electrically induced muscle cramps in hypohydrated humans. Miller KC, Mack GW, Knight KL, Hopkins JT, Draper DO, Fields PJ, et al. Med Sci Sports Exerc, 2010. PMID 19997012
  6. Pickle Juice Intervention for Cirrhotic Cramps Reduction: The PICCLES Randomized Controlled Trial. Tapper EB, Salim N, Baki J, Zhao Z, Sundaram V, Patwardhan V, et al. Am J Gastroenterol, 2022. PMID 35416793
  7. Magnesium: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov
  8. Potassium: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov

More about electrolytes

What are electrolytes?Do you need electrolyte drinks every day?What are electrolytes used for?What are the signs of low electrolytes?Are electrolyte supplements safe?Do electrolytes help with dehydration from diarrhea?

For education; not medical advice. Talk to a doctor before you start, stop or change a supplement.