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Best Magnesium for Muscle Cramps (2026)
Bottom line
In our scoring, Magnesium Glycinate rates likely effective: the research is fairly solid for blood pressure reduction. Our top-scored product is Doctor's Best High Absorption Magnesium Glycinate Lysinate (90/100), about $0.17 a day at a clinical dose of 200-400mg elemental magnesium daily. Bottom line: a reasonable pick if it fits your goal. This is our opinion, not medical advice; talk to your clinician before starting.
Take magnesium for cramps is one of the most common pieces of supplement advice going around, but the evidence is more nuanced than the advice. A 2020 Cochrane review found that magnesium is unlikely to help general nighttime leg cramps in the broad population. Where it does help is cramps tied to an actual magnesium deficiency - common in athletes, people on diuretics, and those who eat poorly. We scored magnesium products for cramp relief on bioavailability and how easy they are on your gut, because the form makes a big difference.
The Verdict
For muscle cramps, magnesium is the common recommendation, though the evidence is honestly mixed: it tends to help when you are actually low in magnesium and does little when you are not. Glycinate is the form to use because it absorbs well and is gentle on the gut. The best overall is Doctor's Best High Absorption Magnesium Glycinate Lysinate, third-party tested, at about $0.13 a day for a 200mg elemental dose. The best value is NOW Foods Magnesium Glycinate at roughly $0.09 per effective dose, and Pure Encapsulations Magnesium (Glycinate) is the cleanest verified pick at about $0.33. Give it four to six weeks, judge by elemental magnesium, and if cramps persist, see a doctor to rule out electrolyte, medication, or vascular causes.
What the Evidence Says About Magnesium Glycinate
How A-F grades work- ABlood pressure reduction
- BSleep quality improvement
- BMuscle cramp reduction
- CAnxiety and stress reduction
- BMigraine prevention
- BType 2 diabetes / glucose metabolism
A = strong RCT evidence · B = moderate · C = limited · D = weak · F = no evidence.
Our Top Picks
Doctor's Best High Absorption Magnesium Glycinate Lysinate
$0.17/day at effective dose
Nested Naturals Magnesium Glycinate
$0.13/day at effective dose
Pure Encapsulations Magnesium (Glycinate)
$0.42/day at effective dose
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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.
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.
Life Extension Magnesium Caps 500mg
magnesium oxide, citrate, succinate, bisglycinate chelate blend | 500mg/serving | 100 servings
High elemental magnesium per cap, but the oxide component means lower overall absorption. Best for those wanting a high-dose general magnesium.
Also Scored
KAL Magnesium Glycinate 400mg
$0.10/day | magnesium glycinate (ActivTab technology)
Full score breakdownNutricost Magnesium Glycinate
$0.16/day | magnesium bisglycinate; 3 capsules per 210mg serving
Full score breakdownNatureBell Pure Magnesium Glycinate 500mg
$0.14/day | magnesium glycinate; 90mg elemental per 500mg capsule, ~2 capsules for a clinical dose
Full score breakdownNature's Bounty High Absorption Magnesium Glycinate
$0.27/day | magnesium glycinate; 2 capsules per 240mg serving
Full score breakdownDouble Wood Magnesium Glycinate 400mg
$0.22/day | magnesium bisglycinate; ~60mg elemental per 400mg capsule, ~3 capsules per clinical dose
Full score breakdownSolaray Magnesium Glycinate
$0.61/day | magnesium bisglycinate chelate with BioPerine; 4 capsules per 350mg serving
Full score breakdownLife Extension Neuro-Mag Magnesium L-Threonate
$0.93/day | magnesium L-threonate (Magtein)
Full score breakdownWhat 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)
Our #1 Pick
Doctor's Best High Absorption Magnesium Glycinate Lysinate
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.
Sources
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.