When to Take Magnesium and What Are Its Benefits?

Andy Paras

25 Feb, 2026

Magnesium is an essential mineral for life. If you want a complete overview, read our detailed guide on everything you need to know about magnesium. It plays a crucial role in many biological functions that support energy, physical health, and mental well-being. But when should you take it, where is it stored in the body, and why do so many people lack it? Let’s answer these questions with 10 key points about magnesium.

1. When Should You Take Magnesium and How Does It Work?

Magnesium is involved in over 300 enzymatic reactions in our cells. Think of it as a spark that starts the engine of a car—it activates the processes your body needs to function.

For example, in the Krebs cycle, a set of 10 biochemical reactions that produce ATP (the main energy your cells use), magnesium acts as a cofactor in 4 of these steps. This makes it essential for energy production and helps fight fatigue. If you're constantly tired, you may want to explore the real causes of low magnesium levels.

2. Does Magnesium Have Recognized Health Benefits?

Yes. Scientific authorities recognize several health claims for magnesium. These claims are supported by solid evidence to protect consumers from false marketing.

Magnesium has 10 approved health claims, including that it:

Reduces fatigue
Supports energy production in cells
Helps transmit nerve signals
Promotes muscle relaxation
Supports protein synthesis
Maintains healthy bones
Supports normal mental function

These benefits explain why magnesium is often recommended in cases of stress, muscle tension, and poor sleep. You can read more about the health benefits of magnesium for sleep and relaxation.

3. Where Is Magnesium Stored in the Body?

50–60% is in your bones and teeth
25% is in your muscles
The total magnesium content in an adult body is roughly 25 grams

4. How Many People Lack Magnesium?

Studies show that about 70% of adults don’t get enough magnesium. Learn how to recognize the early signs of magnesium deficiency before symptoms worsen. Many consume less than two-thirds of the recommended daily amount—300 mg for women and 380 mg for men.

5. Why Do So Many People Lack Magnesium?

The main reasons:

Modern diets are low in micronutrients due to intensive farming and industrialization
Food processing (refining, ultra-processing, cooking) removes much of the magnesium

For example, cereals are a good source of magnesium, but only in their whole-grain form. Refining removes magnesium, which is mainly in the grain’s outer layer.

6. Can You Be Deficient Even with a Balanced Diet?

Yes. Even a healthy diet may not fully meet your magnesium needs due to:

Stress (magnesium is lost more quickly)
Alcohol and tobacco (acidifying effect)
Heavy sweating (athletes lose magnesium)
High caffeine intake

7. Should You Supplement Magnesium if You Drink a Lot of Coffee?

Caffeine stimulates cortisol, the stress hormone, which helps with alertness, energy, and concentration. But caffeine is also diuretic, which increases magnesium loss through urine.

This creates a vicious cycle: fatigue leads to more coffee, which leads to more magnesium loss, increasing fatigue. That’s why high coffee consumers often benefit from magnesium supplements.

8. How Does Stress Affect Magnesium Levels?

Stress increases magnesium needs because magnesium helps regulate the nervous system. Discover how magnesium supports mental health and stress resilience.

Magnesium is also a cofactor for vitamin B6, which is needed to convert tyrosine into dopamine, the neurotransmitter of action, motivation, and stress adaptation.

Dopamine affects:

Mood regulation
Stress perception
Performance and motivation

9. How to Boost Magnesium Intake

In situations like stress, fatigue, or ultra-processed diets, or if you notice deficiency signs (fatigue, muscle cramps, eyelid twitching, tingling), increase magnesium intake through:

Nuts and seeds: almonds, walnuts
Whole grains: whole wheat bread, pasta, brown rice
Seafood: shellfish
Vegetables: spinach, green leafy vegetables
Other foods: bananas, dark chocolate, certain mineral waters

Magnesium supplements are also useful, especially forms that are well absorbed and gentle on the digestive system.

If you're planning to improve your diet naturally, check our guide on top energy-boosting foods to power your day.

10. Which Form of Magnesium Is Best?

We generally recommend organic magnesium salts, such as:

Bisglycinate
Gluconate
Malate
Citrate
Lactate

Among these, bisglycinate magnesium is especially effective. It’s highly absorbable and digestively gentle because it’s combined with two glycine molecules. This “amino-chelated” form protects magnesium during digestion, improves absorption, and avoids stomach discomfort.

If you're unsure which supplement to choose, read our comparison of the best magnesium supplements for optimal absorption.

Conclusion

Magnesium is vital for energy, muscle function, stress management, and overall health. Whether through diet or high-quality supplements, ensuring adequate magnesium is key to feeling your best every day.

📚 Medical sources

National Institutes of Health – Office of Dietary Supplements.
Magnesium Fact Sheet for Health Professionals.
World Health Organization.
Magnesium in Drinking-water: Background document for development of WHO Guidelines for Drinking-water Quality.
Harvard T.H. Chan School of Public Health: The Nutrition Source – Magnesium.
Mayo Clinic: Magnesium deficiency: Symptoms and causes.
Volpe, S. L. (2013). Magnesium in disease prevention and overall health. Advances in Nutrition, 4(3), 378S–383S.
Gröber, U., Schmidt, J., & Kisters, K. (2015). Magnesium in prevention and therapy. Nutrients, 7(9), 8199–8226.