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Bananas are widely used for muscle cramp relief due to their potassium, magnesium, and calcium content. However, clinical evidence specifically for exercise-associated muscle cramps (EAMC) is weak—two Ironman triathlete studies found no association between electrolyte levels and EAMC. Evidence for general (non-exercise-related) cramps caused by electrolyte deficiency is better supported.

Calcium (hypocalcemia) is recognized as a cause of muscle cramps, tetany, and spasms in standard medical references including NIH and StatPearls. Calcium is essential for muscle contraction and relaxation; low intake is associated with muscle spasms, cramps, and weakness. Correction of hypocalcemia resolves neuromuscular symptoms including cramping.

Large sweat-induced losses of chloride (alongside sodium) are associated with exercise-associated muscle cramps (EAMC). Electrolyte-containing solutions that restore chloride and sodium reduce cramp susceptibility more effectively than plain water. American football players with sweat chloride losses above a threshold were approximately 9 times more likely to be cramp-prone.

L-carnitine has shown benefit for muscle cramps in patients with cirrhosis in prospective studies and small clinical trials. It facilitates fatty acid transport into mitochondria and was associated with decreased incidence and severity of muscle cramps at 1200 mg/day in a prospective study of cirrhotic patients. A systematic review of treatment options in cirrhosis confirmed l-carnitine showed beneficial effects on muscle cramps.

Magnesium is the most studied mineral supplement for skeletal muscle cramps. Cochrane reviews of multiple RCTs found it unlikely to provide meaningful cramp prophylaxis in older adults with idiopathic cramps (moderate-certainty evidence), but evidence for pregnancy-associated leg cramps remains conflicting. Magnesium deficiency impairs muscle relaxation, as muscles contract normally but struggle to fully release when levels are low.

Potassium deficiency (hypokalemia) is a well-established medical cause of muscle cramps and spasms, documented in NIH/StatPearls and standard medical references. Hypokalemia disrupts neuromuscular transmission and impairs muscle contraction, with symptoms including muscle weakness, cramps, and spasms. Correction of hypokalemia relieves cramp symptoms.

Sodium deficiency (hyponatremia) is a recognized medical cause of skeletal muscle cramps. Sodium is essential for muscle membrane potential and neuromuscular signaling; significant sweat-induced sodium loss (20–30% of the sodium pool) has been linked to severe muscle cramping in athletes. Oral rehydration solutions containing sodium reduce cramp susceptibility compared to plain water.

Taurine has RCT-level evidence for reducing muscle cramps in patients with chronic liver disease/cirrhosis, where plasma taurine levels are depleted. A double-blind crossover RCT of 30 patients found that 1000 mg taurine twice daily significantly reduced leg cramping versus placebo. A 2024 systematic review of 12 RCTs confirmed taurine supplementation reduced cramp frequency, severity, and duration compared to placebo.

Muscle cramps and pain are recognized clinical features of thiamine deficiency, linked to impaired cellular energy metabolism and metabolic acidosis in muscle tissue. Thiamine is essential for normal skeletal and cardiac muscle function.

Zinc supplementation has shown benefit for muscle cramps in cirrhotic patients with documented low serum zinc, based on small observational studies. A systematic review of cramp treatments in cirrhosis concluded zinc was safe and showed beneficial effects on muscle cramps. Evidence is limited to disease-state-associated cramps and small, non-randomized studies.

Camphor oil is documented in traditional medicine as an antispasmodic applied topically for muscle cramps. Pharmacological reviews confirm antispasmodic activity among camphor's documented properties. No human clinical trials specifically for muscle cramps with camphor oil have been published.

Clematis, particularly C. vitalba and C. recta, has been documented in European and Asian folk medicine as a remedy for muscle spasms and leg cramps. This use is noted in ethnobotanical records but lacks any clinical or controlled animal-model evidence specifically targeting muscle cramp mechanisms.

Cramp bark (Viburnum opulus) has been used in European and Native American herbal medicine for over 200 years as an antispasmodic for muscle cramps, menstrual cramping, and muscle spasms, as documented in the British Herbal Pharmacopoeia. Its active constituents—scopoletin and viopudial—relax smooth and skeletal muscle through calcium channel antagonism in preclinical studies. No peer-reviewed RCTs in humans have confirmed its efficacy for muscle cramps.

Wild yam has been used traditionally as an antispasmodic for muscular spasms and cramps of various types. Its action on smooth muscle is central to this use, documented in multiple herbal traditions. Experimental evidence for skeletal muscle effects exists in animals, but no human trials.

Dong Quai is used in TCM for smooth muscle spasm and cramps, particularly uterine cramps, abdominal spasm, and by extension musculoskeletal cramps. Ligustilide and phthalides are documented antispasmodic agents that inhibit smooth muscle contractions. This use is supported by pharmacological data but not by clinical RCTs targeting skeletal muscle cramps specifically.

Lemongrass is documented in folk medicine for muscle cramps and spasms. Its antispasmodic classification in pharmacological reviews is supported by smooth muscle relaxant activity of citral demonstrated in preclinical work. No human clinical trials for muscle cramps have been conducted.

Paeonia lactiflora root has been used in TCM for over 1,200 years for muscle cramping and spasms. The combination of peony and licorice (Shaoyao Gancao Tang) is a well-documented classical formula with antispasmodic effects supported by some clinical data.

Wild yam is one of the oldest traditional antispasmodics in North American herbalism, used specifically for smooth and skeletal muscle cramps. Its antispasmodic action is attributed to steroidal saponins, particularly diosgenin, acting on smooth muscle. Clinical trial evidence for this use does not exist; the support is entirely traditional and preclinical.