What magnesium does in the body
Magnesium is the fourth most abundant mineral in the human body and one of the hardest working. It acts as a cofactor for hundreds of enzymes, which means many processes simply will not run without it. Most of your supply is stored in bones and muscles, while only about 1% circulates in the blood — so a standard blood test does not always reveal the full picture.
- Nervous system: helps calm over-excited neurons and lowers your sensitivity to stress.
- Muscles: allows a muscle fibre to relax after contracting — when levels drop, muscles stay tense and cramp.
- Sleep: supports melatonin production and the receptors that govern calming down and falling asleep.
- Heart and blood vessels: helps keep a steady heartbeat and plays a part in regulating vascular tone and blood pressure.
- Energy and ATP: the energy molecule ATP is only biologically active when bound to magnesium — without it, your cellular fuel stalls.
- Bones: around 60% of your magnesium sits in the skeleton, working alongside calcium and vitamin D.
Signs you may be low on magnesium
A shortfall rarely announces itself with one dramatic symptom. It usually shows up as a handful of small red flags that are easy to blame on tiredness or age. If several of these sound familiar at once, it is worth reviewing your diet and talking to your doctor.
- Night-time cramps and spasms in the calves, a twitching eyelid or muscle.
- Constant fatigue and low energy even after a full night of sleep.
- Irritability, anxiety and a wired, on-edge feeling.
- Sleep trouble: hard to drift off, light sleep, frequent waking.
- Cravings for sweets and chocolate (chocolate is rich in magnesium — the body intuitively seeks it out).
- Tension headaches and a heightened reaction to stress.
Who needs extra magnesium
Magnesium stores run down faster in people under heavy load — physical or mental. Certain habits and conditions literally flush the mineral out of the body.
- Anyone living with chronic stress: cortisol increases magnesium loss through urine.
- Athletes and active trainers: magnesium is lost through sweat and spent on muscle recovery.
- Pregnant and breastfeeding women — higher needs (only with medical guidance).
- Heavy coffee and strong tea drinkers: caffeine has a mild diuretic effect.
- Regular drinkers: alcohol impairs absorption and speeds up mineral loss.
- People over 50 and those who eat a lot of fast food and refined products.
Forms of magnesium: which absorbs best
On the pharmacy shelf and in supplement catalogs you will find several forms of magnesium, and they differ noticeably in bioavailability and character. The right choice depends on your goal: some work better for sleep and nerves, others for energy.
- Magnesium citrate — good bioavailability and a solid all-rounder; in large doses it can have a mild laxative effect.
- Glycinate (bisglycinate) — gentle on the stomach, linked to calm and sleep, ideal for an evening dose.
- Magnesium malate — bound to malic acid, often chosen for daytime energy and fatigue.
- Magnesium oxide — cheap and high in elemental magnesium per tablet, but absorbs the least; mostly acts on the gut.
- Taurate and threonate — niche forms positioned for heart and cognitive support.
What to look for in the catalog
The Welllab line — the nutraceutical brand by Greenway — includes standalone magnesium supplements and complexes that pair it with vitamin B6 and other synergists for better uptake. It is a handy reference point if you want a well-absorbed form without spending an evening decoding labels. Check the exact composition, dose and form on each product page in the catalog.
How to take magnesium
Magnesium absorbs best in modest portions and alongside vitamin B6, which helps the mineral get inside the cell. A few practical pointers:
- Timing: relaxing forms (glycinate, citrate) make sense in the evening, closer to bedtime — they support sleep.
- With food: taking it during or after a meal is gentler on the stomach and reduces the laxative risk.
- Dosage: a common daily guideline for adults is around 300–400 mg of elemental magnesium, factoring in what you already get from food. Confirm your exact dose with a doctor.
- In courses: supplements are usually taken in cycles; the cumulative effect is often noticeable after 2–4 weeks.
- Not all at once: split a larger dose into two servings to improve absorption.
Magnesium in food
The foundation is always built on food, with supplements closing the gap. Unrefined plant foods carry the most magnesium:
- Pumpkin seeds, chia seeds and sesame — among the most concentrated sources.
- Nuts: almonds, cashews, hazelnuts.
- Dark chocolate and cocoa (70% and above).
- Legumes: beans, chickpeas, lentils.
- Leafy greens: spinach and chard.
- Whole grains and buckwheat.
The bottom line
Magnesium is the mineral of calm and energy at once: it relaxes muscles and nerves, supports sleep, a steady heartbeat and cellular energy production. If several deficiency signs apply to you, start by reviewing your diet and, if needed, add a well-absorbed form (citrate or glycinate) as a course. Remember: a dietary supplement is not a medicine — it does not treat disease and does not replace therapy prescribed by a doctor. Before you start, especially with chronic conditions, pregnancy or ongoing medication, consult your doctor.