Magnesium
Description
Magnesium is a vital mineral involved in over 300 enzymatic reactions in the body, crucial for energy production, protein synthesis, and the repair of genetic material. It plays a key role in nerve function, muscle contraction, and maintaining a normal heart rhythm. This essential mineral also facilitates the active transport of Calcium and Potassium ions across cell membranes, which is critical for nerve impulse conduction, muscle contraction, and maintaining healthy cardiovascular function. It is essential for bone health, contributing to bone density and structure, and is involved in the regulation of Calcium and Vitamin D levels. Magnesium also supports a healthy immune system and helps regulate blood glucose levels. Its involvement in neurotransmitter function further makes it important for mood regulation and stress response. Magnesium deficiency is common and can manifest as muscle cramps, fatigue, irritability, and sleep disturbances. Supplementation can help address these deficiencies and support various physiological functions. Different forms of magnesium (e.g., citrate, glycinate, oxide) offer varying bioavailability and specific benefits.
Sources
Leafy green vegetables (spinach, kale)Nuts (almonds, cashews)Seeds (pumpkin, chia)Legumes (black beans, lentils)Whole grains (brown rice, oats)Dark chocolateAvocadosBananas
Cheapest Magnesium supplements
Best Magnesium Supplements
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Timing & Intake
AnytimePreferred: EveningWith foodTake with Food, especially if prone to digestive upset.
Taking Magnesium in the evening may promote relaxation and better sleep. Taking it with food can help minimize potential gastrointestinal discomfort.
Daily Intake
RDA (Men)420 mg
RDA (Women)320 mg
RDI420 mg
Optimal Dosage
Minimum400 mg
Maximum600 mg
Safety & Toxicity
Upper Limit (UL)350 mg
Toxicity Threshold500 mg
Toxicity EffectDiarrhea, abdominal cramping
Goals
Anti-Aging
Impact
Highest effect
Typical dose:200–500 mg
Magnesium plays a vital role in ATP synthesis, the body's primary energy currency. It also helps regulate blood pressure, supports nerve function, and promotes relaxation and sleep quality, which are often compromised with age. Bioavailable forms like glycinate or citrate are preferred.
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Bone Health
Impact
Highest effect
Typical dose:200–450 mg
Magnesium is a vital cofactor in over 300 enzymatic reactions, including those essential for bone formation. It helps regulate calcium transport and is required for the proper function of the parathyroid hormone, which controls bone breakdown. Deficiency can lead to impaired bone crystal formation.
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Brain Health
Impact
Highest effect
Typical dose:200–400 mg
Magnesium is a critical cofactor in hundreds of enzymatic reactions in the brain. It regulates neurotransmitter release, gates the NMDA receptor involved in learning and memory, and helps calm the nervous system by balancing cortisol, thereby improving sleep quality which is vital for memory consolidation.
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Cardiovascular Support
Impact
Highest effect
Typical dose:200–400 mg
Magnesium is a cofactor in hundreds of enzymatic reactions, including those vital for cardiovascular health. It helps maintain the electrical stability of heart cells, counteracts calcium to promote vasodilation (blood vessel relaxation), and improves insulin sensitivity, all of which contribute to a healthy cardiovascular system. Deficiency is common and linked to increased cardiovascular risk.
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Cognitive Support
Impact
Highest effect
Typical dose:200–400 mg
Magnesium is a critical cofactor in over 300 enzymatic reactions in the body, many of which occur in the brain. It plays a key role in synaptic plasticity (the basis of learning and memory) and helps calm the nervous system. Highly bioavailable forms like Magnesium L-Threonate are particularly noted for their ability to cross the blood-brain barrier.
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Interactions
Positive Interactions
Vitamin D
Magnesium is essential for the activation of Vitamin D in the body, which in turn helps with Calcium absorption. Adequate magnesium is required for Vitamin D to function effectively.
Calcium
Magnesium helps regulate Calcium levels in the body, prevents excessive Calcium buildup in soft tissues, and is crucial for bone and cardiovascular health. They work synergistically in muscle and nerve function.
Potassium
Magnesium helps maintain healthy Potassium levels within cells, crucial for electrolyte balance, nerve function, and heart health.
Vitamin B6
Vitamin B6 can enhance the absorption and cellular uptake of Magnesium, potentially increasing its effectiveness.
Zinc
Magnesium and Zinc are cofactors in numerous enzymatic reactions and support each other in various physiological processes, including immune function and metabolism.
Negative Interactions
Calcium
Very high doses of Calcium can compete with Magnesium for absorption in the intestine. It is best to ensure an appropriate balance between the two minerals.
Zinc
Extremely high doses of Zinc can potentially interfere with Magnesium absorption if taken simultaneously in very large amounts. It's advisable to separate doses or ensure a balanced intake.
Iron
High doses of Iron supplements may interfere with Magnesium absorption if taken at the same time. Consider separating the intake of these minerals by a few hours.
Product stats
Price per product
Average$22.96
Median$20.78
Price per serving
Average$0.55
Median$0.44
Price per 100 mg
Average$0.10
Median$0.07
Price distribution
Price per serving distribution
Price per 100 mg
Reference amount: 100 mg
Forms
Paired ingredients
Ingredient forms
Magnesium Oxide (353) 40
Magnesium Oxide is an inorganic salt with a high elemental magnesium content (around 60%), making it seem like a potent source. However, its absorption rate into the bloodstream is poor, typically around 4%. Due to this low bioavailability, it is primarily effective locally in the gastrointestinal tract, where it draws water into the bowels, softening stool and stimulating bowel movements. It can also neutralize stomach acid.
Pros
- High elemental magnesium content per dose
- Effective for constipation relief
- Acts as an antacid
- Generally inexpensive
Cons
- Very low bioavailability for systemic use
- High potential for laxative effects even at moderate doses
- Not ideal for addressing magnesium deficiency beyond gut-related issues
Per product
Avg$22.48
Med$19.89
Per serving
Avg$0.52
Med$0.39
Per 100 mg
Avg$0.18
Med$0.10
Price distribution
Magnesium Citrate (298) 75
Magnesium Citrate is a well-researched and popular form where magnesium is combined with citric acid. It has relatively good bioavailability (around 25-30%), meaning a significant portion is absorbed into the bloodstream. It is often recommended for correcting magnesium deficiencies and can also act as a mild osmotic laxative at higher doses, drawing water into the intestines to facilitate bowel movements.
Pros
- Good bioavailability for systemic absorption
- Effective for magnesium supplementation
- Can aid in constipation relief
- Widely available and affordable
Cons
- May cause loose stools or diarrhea in sensitive individuals or at higher doses
- Citric acid can be acidic for some stomachs
Per product
Avg$27.91
Med$21.58
Per serving
Avg$0.70
Med$0.49
Per 100 mg
Avg$0.28
Med$0.10
Price distribution
Magnesium Aspartate (90) 70
Magnesium Aspartate is a chelated form where magnesium is bound to aspartic acid, an amino acid involved in the body's energy production. This chelation generally enhances absorption compared to inorganic forms like oxide. Aspartate is also an excitatory neurotransmitter, which some individuals may find stimulating, though this effect is typically minor at supplemental doses.
Pros
- Good bioavailability due to chelation
- Aspartate is involved in energy metabolism
- Less likely to cause digestive upset than some inorganic forms
Cons
- Some individuals may be sensitive to aspartate's excitatory properties, though rare at typical doses.
- Less commonly found than citrate or glycinate.
Per product
Avg$25.47
Med$22.09
Per serving
Avg$0.51
Med$0.43
Per 100 mg
Avg$0.13
Med$0.07
Price distribution
Magnesium Carbonate (42) 60
Magnesium Carbonate is an inorganic magnesium salt that, upon contact with stomach acid, reacts to form magnesium chloride and releases carbon dioxide. This reaction contributes to its antacid properties and can cause bloating or belching. Its bioavailability is moderate, generally better than magnesium oxide but lower than chelated forms. It can also act as a laxative due to its osmotic effect in the bowels.
Pros
- Effective as an antacid
- Can provide relief for occasional constipation
- Moderately better bioavailability than magnesium oxide
Cons
- Can cause bloating or belching due to gas production in the stomach
- Moderate bioavailability; not ideal for severe magnesium deficiency
- May have laxative effects at higher doses
Per product
Avg$25.12
Med$23.99
Per serving
Avg$0.53
Med$0.50
Per 100 mg
Avg$0.15
Med$0.19
Price distribution
Magnesium Glycinate (42) 90
Magnesium Glycinate is a chelated form where magnesium is bound to glycine, a non-essential amino acid. This form is highly bioavailable and generally considered one of the most absorbable and gentle forms of magnesium on the digestive system, making it suitable for those prone to digestive upset. Glycine itself has calming properties, acting as an inhibitory neurotransmitter, which enhances magnesium's relaxing effects.
Pros
- Excellent bioavailability and absorption
- Very gentle on the stomach; less likely to cause laxative effects
- Glycine offers additional calming and sleep-promoting benefits
- Ideal for addressing magnesium deficiency effectively
Cons
- Can be more expensive than less bioavailable forms
- Lower elemental magnesium content per capsule compared to oxide, meaning more capsules might be needed for high doses.
Per product
Avg$35.87
Med$28.09
Per serving
Avg$0.76
Med$0.56
Per 100 mg
Avg$0.15
Med$0.08
Price distribution
Magnesium Malate (38) 80
Magnesium Malate is a compound formed by binding magnesium to malic acid, a natural fruit acid present in many fruits and involved in the Krebs cycle (cellular energy production). This form offers good bioavailability and is well-tolerated digestively. It is often chosen by individuals seeking to support energy levels, combat fatigue, and alleviate muscle discomfort, including fibromyalgia.
Pros
- Good bioavailability and absorption
- Malic acid plays a role in energy production
- Less likely to cause laxative effects
- Often recommended for muscle pain and fatigue
Cons
- May be less calming than glycinate or taurinate for sleep-specific issues
- Can be slightly more expensive than basic forms
Per product
Avg$27.01
Med$28.12
Per serving
Avg$0.67
Med$0.39
Per 100 mg
Avg$0.22
Med$0.09
Price distribution
Magnesium Taurinate (32) 85
Magnesium Taurinate is a chelated form combining magnesium with taurine, a sulfur-containing amino acid. Both magnesium and taurine are known for their significant roles in cardiovascular health and nervous system function. This combination offers excellent bioavailability and a synergistic effect, particularly beneficial for heart health, blood pressure regulation, and calming the nervous system without causing drowsiness.
Pros
- High bioavailability and absorption
- Taurine offers additional benefits for cardiovascular health and nerve function
- Supports healthy blood pressure and heart rhythm
- Can have calming effects without sedation
Cons
- Potentially more expensive than common forms
- Less widely available than some other forms
Per product
Avg$30.96
Med$26.99
Per serving
Avg$0.86
Med$0.59
Per 1000 mg
Avg$0.32
Med$0.20
Price distribution
Magnesium Amino Acid Chelate (28) 88
Magnesium Amino Acid Chelate refers to a form where magnesium ions are bonded to amino acids. This chelation process creates a stable compound that is easily recognized and absorbed by the body through amino acid transport pathways, leading to very high bioavailability. These forms are typically gentle on the digestive system and are less likely to cause the laxative effects associated with less absorbable magnesium salts. Examples include magnesium glycinate and bisglycinate.
Pros
- Very high bioavailability and absorption rates
- Excellent digestive tolerability, minimal laxative effect
- Effective for correcting magnesium deficiency
- Amino acids may offer additional synergistic benefits depending on the specific amino acid
Cons
- Can be more expensive than inorganic forms
- Exact amino acid composition may vary between products labeled generally as 'amino acid chelate'
Per product
Avg$30.05
Med$28.97
Per serving
Avg$0.66
Med$0.52
Per 100 mg
Avg$0.12
Med$0.12
Price distribution
Magnesium Ascorbate (25) 75
Magnesium Ascorbate is a mineral ascorbate, meaning magnesium is bound to ascorbic acid (Vitamin C). This form provides two essential nutrients simultaneously and is considered a 'buffered' form of Vitamin C, making it less acidic and gentler on the stomach compared to plain ascorbic acid. It delivers both magnesium for its myriad roles and Vitamin C for immune function, collagen production, and antioxidant support.
Pros
- Provides two essential nutrients in one compound
- Buffered form of Vitamin C, gentle on the stomach
- Good bioavailability for both magnesium and Vitamin C
- Supports immune function and antioxidant defenses
Cons
- Elemental magnesium content per dose might be lower than other dedicated magnesium forms
- May not be the most cost-effective way to get high doses of either nutrient individually
Per product
Avg$35.97
Med$36.29
Per serving
Avg$1.00
Med$0.86
Per 1000 mg
Avg$0.97
Med$0.77
Price distribution
Magnesium Bisglycinate Chelate (23) 95
Magnesium Bisglycinate Chelate is a highly advanced chelated form where one magnesium ion is bonded to two glycine molecules. This double chelation further protects the magnesium from stomach acid, ensuring maximum absorption into the bloodstream and minimal digestive upset. It is widely regarded as one of the best forms for correcting magnesium deficiency, particularly prized for its profound calming and relaxing effects, making it ideal for sleep, stress, and anxiety support due to glycine's role as an inhibitory neurotransmitter.
Pros
- Exceptional bioavailability and absorption rates
- Extremely gentle on the digestive system, virtually no laxative effect
- Glycine's calming properties enhance magnesium's effects for relaxation and sleep
- Optimal for addressing systemic magnesium deficiency and nervous system support
Cons
- Often one of the most expensive magnesium forms
- Elemental magnesium content per dose can be lower due to the size of the glycine molecules
Per product
Avg$24.43
Med$22.99
Per serving
Avg$0.50
Med$0.39
Per 100 mg
Avg$0.15
Med$0.08
Price distribution