How much magnesium do you need a day?
Read the right number.

How much magnesium per day: the short answer

Picture two bottles on a pharmacy shelf. One says “Magnesium Glycinate 1,000 mg”. The other says “Magnesium 440 mg”. The first sounds bigger. It isn’t. The first is the weight of the whole compound; the second is the magnesium itself.

That one idea, elemental magnesium, is what this guide is about. Once you know it, you can read any label in India and work out exactly how close you are to your daily target.

Magnesium matters because it works in almost every part of the body. It contributes to the reduction of tiredness and fatigue, normal energy-yielding metabolism, normal muscle function, normal functioning of the nervous system, normal psychological function and the maintenance of normal bones and teeth.1 An adult body holds about 25 g of it, mostly in bones and muscles, with less than 1% in the blood.2

Magnesium RDA in India: 440 mg for men, 370 mg for women

India sets its own targets. The Indian Council of Medical Research’s National Institute of Nutrition (ICMR-NIN) publishes two numbers for each nutrient:3

• EAR (Estimated Average Requirement): the amount that meets the needs of half of healthy adults.
• RDA (Recommended Dietary Allowance): the amount that covers almost everyone. This is the number to aim for.

India’s numbers went up in 2020: the men’s RDA rose from 385 mg to 440 mg, and the women’s from 325 mg to 370 mg.5 Both are now higher than the US and European figures. The same RDA applies after 60: 440 mg for men and 370 mg for women. Needs rise to 440 mg in pregnancy and 400 mg while breastfeeding, so ask your doctor for your number then.21

Elemental magnesium vs the compound

On its own, magnesium is a metal, so you can’t swallow it as it is. In a supplement, it is always joined to a partner molecule. That pair is the compound: magnesium glycinate, magnesium citrate, magnesium oxide and so on.

The partner has weight too. So “1,000 mg of magnesium glycinate” means 1,000 mg of magnesium and glycine together. The magnesium inside is only a small share. In the United States, the Supplement Facts panel shows the elemental magnesium, not the weight of the whole compound.2 In India, labels vary, so it pays to check.

Look at the top row. Oxide packs the most magnesium into each milligram, which is why it makes labels look big and tablets cheap. But how much you absorb matters as much as how much is in the tablet. In one study, only about 4% of magnesium oxide was absorbed, against 9–11% for more soluble forms.6 In a 60-day trial, an amino-acid chelate of magnesium raised blood magnesium better than oxide, which did no better than a placebo.7

The same trick on omega-3 labels

Fish oil labels work the same way. A “1,000 mg fish oil” softgel is the weight of the whole oil, not the omega-3s inside it. What counts is the EPA and DHA. EPA and DHA contribute to normal heart function, and DHA to normal brain function, at 250 mg a day.1 So read omega-3 labels the way you read magnesium labels: find the active amount, then do the maths. Oily fish twice a week is the simplest food source; vegetarians can look for algae oil, which gives EPA and DHA without fish.

Elemental magnesium calculator

How much magnesium glycinate gives you 440 mg?

This is why a true magnesium glycinate needs more than one tablet. The chelate is mostly glycine by weight, so a full day’s magnesium simply weighs more. That extra weight is not wasted: it is glycine. In small sleep studies, 3 g of glycine before bed improved how well people slept and how alert they felt the next day.89

Magnesium glycinate is also known for being gentle. Bisglycinates are judged “not of safety concern” as a source of magnesium in Europe,10 and in a clinical study magnesium diglycinate was better tolerated by the gut than magnesium oxide.11 For the full form comparison, read magnesium glycinate vs citrate vs oxide.

How much magnesium do you get from food?

Food comes first. A small handful of foods can cover a good share of your day:212

For a full list with Indian portions, from ragi roti to rajma, see our guide to magnesium-rich foods in India.

Notice the bottom row. Brown rice has about four times the magnesium of white rice, because milling strips the outer layers where minerals sit.2 A plate of white rice, a thin dal and a little sabzi can leave a real gap. Our guide to magnesium deficiency in India explains who is most likely to fall short.

Can food alone get you to about 400 mg? Yes, with a little planning: a small handful of pumpkin seeds, a ragi roti or dosa made with 100 g of flour, a handful of almonds and a bowl of spinach add up to about 450 mg. One banana, by contrast, gives about 32 mg.

Magnesium dosage for supplements: how much is right?

Think of your RDA as a target and your food as the first part of it. A supplement covers the rest.

• India’s rule. Under FSSAI’s 2022 health-supplement regulations, a vitamin or mineral in a supplement must not exceed one RDA, and must give at least 15% of it when a nutrient claim is made.13 For magnesium, that means up to 440 mg per serving.
• What studies used. A 2025 sleep trial gave 250 mg a day of magnesium as bisglycinate.14 A stress trial in adults low in magnesium used 300 mg a day.15 A muscle-soreness trial used 350 mg a day of magnesium glycinate.16 In a review of 34 trials, 300 mg a day for one month was enough to raise blood magnesium.17
• Form decides comfort. Loose stools from magnesium supplements are mostly linked to poorly absorbed forms such as magnesium oxide. Magnesium diglycinate was better tolerated than oxide in a clinical study,11 and bisglycinates are judged “not of safety concern” in Europe.10

For men, three tablets of a 147 mg-per-tablet product give the full 440 mg RDA. For women, two tablets (about 293 mg) sit within the 370 mg RDA. If your diet is already rich in seeds, nuts and dals, a smaller serving may be all you need. For timing, see the best time to take magnesium glycinate; for goals, read about magnesium for stress and anxious days and muscle recovery.

Is it better to split your magnesium?

Your gut takes in magnesium through a limited number of doorways. A small amount gets through easily; a big amount at once leaves more behind. In a classic study, the share absorbed fell from 65% at the smallest dose to 11% at the largest.18 In another, men drank the same magnesium-rich water as two servings or seven: absorption was 32% with two and 51% with seven.19

You don’t need seven doses. One tablet with dinner and the rest before bed uses the same idea, and splitting is also the gentlest way on your stomach. For timing by goal, read the best time to take magnesium glycinate.

When to take more care with magnesium

• Kidney disease. Healthy kidneys clear extra magnesium. When kidneys don’t work well, magnesium can build up, so check with your doctor first.2
• Acid reducers. Taking a proton pump inhibitor (such as pantoprazole or omeprazole) for over a year can lower blood magnesium. The US FDA advises doctors to check magnesium levels in long-term users.2
• Water pills. Loop and thiazide diuretics can increase magnesium lost in urine; potassium-sparing ones reduce it.2
• Medicines to space apart. Take tetracycline or quinolone antibiotics at least 2 hours before or 4–6 hours after magnesium, keep bisphosphonates for bone at least 2 hours apart, thyroid medicine (levothyroxine) about 4 hours apart, and gabapentin at least 2 hours after magnesium.22 Our guide to magnesium and medicines covers each one.220
• Antacids and laxatives count too. Some contain a lot of magnesium; one tablespoon of a common milk-of-magnesia laxative has 500 mg. Add these to your total.2
• Signs you are taking too much: loose stools, nausea and stomach cramps. Serious magnesium toxicity is rare and mostly seen with kidney problems or very large laxative or antacid doses.2

How to work out your magnesium: a 6-step plan

1. Know your target440 mg a day for Indian men and 370 mg for women, from food and supplements together.
2. Fill the plate firstAdd seeds, nuts, ragi, dals, beans, whole grains and leafy greens every day.
3. Read the elemental numberOn every label, find the magnesium itself, not the compound weight. Use the calculator if only the compound is given.
4. Choose a gentle, well-absorbed formA fully reacted, non-buffered magnesium glycinate is about 12% magnesium and kind to the stomach.
5. Split your doseTake part with dinner and the rest before bed, rather than all at once.
6. Check with your doctor when neededKidney disease, pregnancy, breastfeeding, acid reducers, water pills or thyroid medicine are good reasons to ask first.

Claims are ingredient-based and not specific to any product. Details of each study are in “About the studies” just below.