Magnesium: Why It Matters and How to Get Enough

Magnesium is a quietly essential mineral involved in hundreds of processes — muscle and nerve function, blood sugar, blood pressure, and sleep among them. Yet many people fall short.

Here’s what magnesium does, signs you might need more, and the best food sources before you reach for a supplement.

What magnesium does

It’s a cofactor in more than 300 enzyme reactions, supporting energy production, muscle and nerve function, bone health, and a steady heartbeat. It also plays a role in sleep and stress regulation.

Signs you might be low

Deficiency is often subtle. Muscle cramps, fatigue, poor sleep, and irritability can be signs, though they have many causes. A blood test isn’t always reliable, so diet is the first place to look.

Best food sources

Whole foods make it easy to get enough.

• Pumpkin seeds, almonds, cashews
• Leafy greens like spinach
• Beans, lentils, and edamame
• Whole grains and dark chocolate

Do you need a supplement?

Many people can meet their needs through food. Supplements can help for specific issues (like sleep or cramps), but more isn’t better and some forms cause digestive upset. Check with a professional.

A simple strategy

Eat a handful of nuts or seeds daily, include leafy greens and legumes regularly, and choose whole grains. That covers most people’s magnesium needs.

Frequently asked questions

What are symptoms of low magnesium?

Muscle cramps, fatigue, poor sleep, and irritability can be signs, though they’re nonspecific.

Does magnesium help sleep?

Some people find magnesium supports relaxation and sleep, but food-first is the sensible starting point.

What foods are highest in magnesium?

Pumpkin seeds, almonds, spinach, beans, and dark chocolate are among the richest.

The takeaway

Magnesium quietly supports muscles, nerves, sleep, and hundreds of reactions. Most people can get enough from nuts, seeds, leafy greens, legumes, and whole grains. Reach for food first, and talk to a professional before supplementing.