Magnesium Supplements: Types, Benefits and How Much to Take
What Does Magnesium Do for the Body, and Why Can It Be Detrimental to Be Deficient?
Magnesium may not be the most abundant mineral, but it’s one of the most critical for overall health. Discover its 300+ roles and why deficiency matters.
Magnesium is an essential mineral and electrolyte involved in more than 300 biochemical functions in the body — from regulating heartbeat rhythms to supporting neurotransmitter functions. Hypomagnesemia (magnesium deficiency) is something you really want to avoid.
What Is Magnesium?
Magnesium is an essential mineral and also an electrolyte. It is the least abundant serum electrolyte in the body, yet it plays a vital role in metabolism, enzyme function, energy production, and much more.
The kidneys primarily control magnesium levels and excrete it into the urine daily. We lose stores of magnesium every day through normal functions like muscle movement, heartbeat, and hormone production, so we must regularly replenish it from food or supplements.
What Is Magnesium Used For in the Human Body?
Regulating blood pressure
Helps maintain healthy blood pressure levels.
Keeping bones strong
Works with calcium to support bone density.
Balancing nitric oxide
Supports vascular health and blood flow.
Supporting growth & development
Crucial for babies and children.
Nerves, muscles & tissue
Essential for proper nerve and muscle function.
Digestion & constipation relief
Neutralizes stomach acid and moves stools through the intestine.
Energy production
Key player in over 300 enzymatic reactions.
Bonus: Magnesium also enables photosynthesis in plants by helping form chlorophyll.
Best Magnesium-Rich Foods
While supplements can help, it’s ideal to get magnesium from whole foods. Top choices include:
- Dark leafy greens (spinach, kale, Swiss chard)
- Beans and legumes
- Avocado
- Almonds and other nuts/seeds
- Whole grains
- Dark chocolate (70%+ cacao)
Older adults, athletes, and people under high stress often benefit from supplementation in addition to diet.
Types of Magnesium Supplements
Absorption and bioavailability vary by form. Here’s a breakdown of the most common types:
1. Magnesium Glycinate (Bisglycinate)
Highly absorbable and gentle. Bound to glycine for better relaxation, sleep, stress reduction, and muscle recovery. Excellent for daily long-term use.
2. Magnesium Citrate
Good bioavailability. Often used for digestion and constipation relief due to its mild laxative effect.
3. Magnesium Chloride
Well-absorbed orally or as topical magnesium oil. Great for athletes and those with digestive absorption issues.
4. Magnesium Sulfate (Epsom Salt)
Used in baths for muscle soreness and relaxation. Strong laxative effect when taken orally.
5. Magnesium Oxide
High elemental magnesium but lower absorption. Commonly used for heartburn, acid reflux, and constipation.
6. Magnesium Malate
Bound to malic acid (found in apples). Supports energy production and is gentle on the stomach.
7. Magnesium L-Threonate
Crosses the blood-brain barrier effectively. Promising for cognitive function, memory, and brain health.
8. Magnesium Chelate
Bound to amino acids. Naturally found in food and highly bioavailable with minimal digestive side effects.
9. Magnesium Orotate
Paired with orotic acid for heart health and cellular energy support.
10. Magnesium Taurate
Bound to taurine. Excellent for cardiovascular health, blood pressure, and blood sugar balance.
11. Magnesium Ascorbate
Combined with vitamin C. Gentle on the stomach and provides antioxidant + immune support.
12. Magnesium Lactate
Gentle and well-tolerated for general daily magnesium repletion.
13. Magnesium Carbonate
Used in antacids. Reacts with stomach acid and offers moderate absorption.
14. Magnesium Gluconate
Gentle, well-absorbed form ideal for gradual correction of deficiency.
How Much Magnesium Should You Take Daily?
Recommended Daily Allowances (RDA) from the National Institutes of Health:
| Age Group | Men | Women |
|---|---|---|
| 1–3 years | 80 mg | 80 mg |
| 4–8 years | 130 mg | 130 mg |
| 9–13 years | 240 mg | 240 mg |
| 14–18 years | 410 mg | 360 mg |
| 19–30 years | 400 mg | 310 mg |
| 31+ years | 420 mg | 320 mg |
| Pregnant | — | 350–360 mg |
| Breastfeeding | — | 310–320 mg |
Supplemental upper limit: Most experts recommend ≤350 mg/day from supplements for adults to avoid laxative effects. Best taken in split doses, often in the evening for sleep support.
Risks, Side Effects & Interactions
Excess magnesium from food is safely excreted in urine. Supplements can cause loose stools, diarrhea, nausea, or cramping when taken above 600 mg at once.
Very high doses may lead to low blood pressure, irregular heartbeat, or (rarely) toxicity in people with kidney impairment. Always consult a doctor if you have kidney disease, heart conditions, or take medications like antibiotics or diuretics.
Frequently Asked Questions
Final Thoughts
Magnesium deficiency is one of the most common nutrient shortfalls worldwide. It plays a role in over 300 biochemical reactions and is crucial for heart rhythm, muscle function, energy, sleep, and more.
Focus on magnesium-rich foods first, and consider high-quality supplements (especially glycinate, malate, or threonate) when needed. Always speak with your healthcare provider before starting supplementation, especially if you have existing health conditions.
Stay balanced. Stay energized. Magnesium matters.