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Best Magnesium for Muscle Cramps (2026)
Last reviewed: 2025-03-01 | Based on 10 products scored | Clinical dose: 200-400mg elemental magnesium daily (note: magnesium glycinate is ~14% elemental magnesium by weight)
Magnesium supplementation for muscle cramps is one of the most common supplement recommendations, but the evidence is more nuanced than most people realize. A 2020 Cochrane review found that magnesium supplementation is unlikely to help general nocturnal leg cramps in the overall population. However, cramps associated with actual magnesium deficiency (common in athletes, people on diuretics, and those with poor dietary intake) do respond to supplementation. We scored magnesium products for cramp relief based on bioavailability and GI tolerability, because the form matters enormously.
Our Top Picks
Doctor's Best High Absorption Magnesium Glycinate Lysinate
$0.13/day at effective dose
NOW Foods Magnesium Glycinate
$0.09/day at effective dose
Pure Encapsulations Magnesium (Glycinate)
$0.33/day at effective dose
Detailed Reviews
Doctor's Best High Absorption Magnesium Glycinate Lysinate
magnesium bisglycinate chelate (Albion TRAACS) | 200mg/serving | 120 servings
Uses Albion TRAACS - the most research-backed chelated mineral technology. Best combination of quality and value.
Check Price on Amazon →Nature Made Magnesium Glycinate 200mg
magnesium glycinate | 200mg/serving | 60 servings
One of the few USP Verified magnesium glycinate products. The safety and quality assurance justifies the slight price premium.
Check Price on Amazon →Thorne Magnesium Bisglycinate
magnesium bisglycinate chelate | 200mg/serving | 60 servings
Thorne's manufacturing standards are among the highest in the industry. Trusted by Mayo Clinic and numerous sports teams.
Check Price on Thorne →Also Scored
Pure Encapsulations Magnesium (Glycinate)
$0.33/day | magnesium glycinate
NOW Foods Magnesium Glycinate
$0.09/day | magnesium bisglycinate
Nested Naturals Magnesium Glycinate
$0.10/day | magnesium bisglycinate chelate
Life Extension Magnesium Caps 500mg
$0.12/day | magnesium oxide, citrate, succinate, bisglycinate chelate blend
KAL Magnesium Glycinate 400mg
$0.12/day | magnesium glycinate (ActivTab technology)
Solgar Magnesium Glycinate
$0.22/day | magnesium glycinate chelate
Life Extension Neuro-Mag Magnesium L-Threonate
$0.93/day | magnesium L-threonate (Magtein)
What to Look For When Buying
- ✓Magnesium glycinate or malate are the best-absorbed forms for addressing potential deficiency-related cramps
- ✓The evidence for magnesium helping general nocturnal leg cramps is weak - it works primarily when cramps are caused by actual magnesium deficiency
- ✓Target 200-400mg elemental magnesium daily, split into two doses for better absorption
- ✓Athletes and heavy sweaters lose magnesium through sweat and are more likely to benefit from supplementation
- ✓Magnesium citrate is well-absorbed but more likely to cause loose stools at higher doses
- ✓If cramps persist despite 4-6 weeks of supplementation, consult a doctor to rule out other causes (electrolyte imbalance, medication side effects, vascular issues)
Frequently Asked Questions
What is the best form of magnesium?
It depends on your goal. Magnesium glycinate is best for sleep, relaxation, and anxiety due to the calming effect of glycine and high bioavailability. Magnesium citrate is well-absorbed and good for general supplementation (also has a mild laxative effect). Magnesium oxide has the highest elemental magnesium per pill but the worst absorption (~4%) - best for treating constipation, not deficiency. Magnesium L-threonate (Magtein) may have unique benefits for brain health as it crosses the blood-brain barrier, but it's expensive and the human evidence is limited. Magnesium taurate is sometimes recommended for heart health.
How much elemental magnesium is in magnesium glycinate?
Magnesium glycinate (magnesium bisglycinate) is approximately 14.1% elemental magnesium by weight. A capsule containing 1,000mg of magnesium glycinate provides about 141mg of elemental magnesium. A capsule listed as '500mg magnesium glycinate' provides about 70mg elemental magnesium. ALWAYS check the Supplement Facts panel for the elemental magnesium amount, which is what matters for dosing. Some brands helpfully list both the total compound weight and the elemental amount.
Can I take magnesium glycinate every day long-term?
Yes. Magnesium is an essential mineral your body needs daily and does not store well. Long-term daily supplementation of 200-400mg elemental magnesium is considered safe for adults with normal kidney function. The NIH notes that chronically low magnesium intake is associated with increased risk of cardiovascular disease, type 2 diabetes, and osteoporosis. If anything, consistent daily supplementation is preferable to sporadic use.
When is the best time to take magnesium glycinate?
For sleep: 30-60 minutes before bed. For general supplementation or blood pressure: any consistent time works, though many people prefer evening dosing. If taking a larger dose (300-400mg), splitting into morning and evening doses may improve absorption and reduce any GI effects. Taking with food is not required for glycinate, but can help if you experience any mild stomach discomfort.
Magnesium glycinate vs magnesium citrate - which is better?
Magnesium glycinate is better for sleep, anxiety, and people with sensitive stomachs. It causes significantly less GI distress and the glycine has its own calming benefits. Magnesium citrate is better for general supplementation on a budget and for people who want mild constipation relief as a side benefit. Both have good bioavailability - substantially better than magnesium oxide. If your primary goal is sleep or relaxation, glycinate is the clear winner.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.