The Best Food Sources of Magnesium: A Complete Data Guide

Pumpkin seeds, chia seeds, cooked spinach, black beans, and dark chocolate are among the best food sources of magnesium you can eat regularly. This guide gives you exact milligrams per serving for every major source, explains why certain foods are so much richer than others, and shows you how to build a realistic day of eating that meets the adult RDA without supplements.

The 13 Best Food Sources of Magnesium (With Serving Data)

The table below lists the top food sources ranked by magnesium per typical serving, alongside the percentage of the adult female RDA (310 mg) each serving covers. Data is sourced from the USDA FoodData Central and the NIH Office of Dietary Supplements.

Seeds and Nuts: The Highest Concentration of Magnesium

Seeds and nuts pack more magnesium per ounce than virtually any other food group. This is not a coincidence. A seed is a complete embryo designed to fuel the growth of a new plant. It stores minerals including magnesium in dense, concentrated form. Pumpkin seeds top the list at 156 mg per ounce, followed by chia seeds at 111 mg per ounce and almonds at 80 mg per ounce.

• Pumpkin seeds (pepitas): 156 mg per oz. Eat them raw, roast lightly at low heat, or add to salads and oatmeal.
• Chia seeds: 111 mg per oz. Mix into yogurt, overnight oats, or smoothies. Two tablespoons weigh roughly one ounce.
• Almonds: 80 mg per oz (about 23 almonds). One of the most practical everyday snacks.
• Cashews: 74 mg per oz. Slightly lower than almonds but still a strong source, and lower in phytates than many other nuts.
• Sunflower seeds: approximately 37 mg per oz. Lower than pumpkin seeds but still a useful contributor.

Leafy Greens: Magnesium and the Chlorophyll Connection

Dark leafy greens are consistently rich in magnesium because of a remarkable biochemical fact: magnesium is the central atom of the chlorophyll molecule. Every green plant that photosynthesizes needs chlorophyll, and every chlorophyll molecule is built around a single magnesium ion. This means the greener and denser a vegetable is, the more chlorophyll it contains, and therefore the more magnesium.

Cooked spinach provides 78 mg of magnesium per cup. Cooking wilts the leaves and concentrates the nutrient content significantly. One cup of raw spinach contains only about 24 mg because of the air and water that bulk it up before wilting. Swiss chard, kale, and beet greens all follow a similar pattern. When you eat cooked greens, you are eating a nutritionally condensed version of what you see on the plate raw.

Legumes: Beans as an Underrated Magnesium Source

Beans and legumes are often overlooked in magnesium discussions, but they are one of the most affordable and practical ways to meet your daily requirement. Black beans lead the pack at 60 mg per half-cup of cooked beans. Edamame (young soybeans) delivers 50 mg per half-cup. Lentils, kidney beans, and chickpeas all contribute 35-50 mg per serving as well.

• Black beans (cooked): 60 mg per half-cup. Add to rice bowls, tacos, or salads.
• Edamame (cooked): 50 mg per half-cup. A practical high-protein snack with meaningful magnesium.
• Lentils (cooked): ~36 mg per half-cup. Slower to spike blood sugar than most starches and easy to batch-cook.
• Chickpeas (cooked): ~35 mg per half-cup. Versatile in curries, roasted snacks, or hummus.
• Kidney beans (cooked): ~35 mg per half-cup. Great in soups and chili.

Legumes also come with a bioavailability caveat. Like seeds and nuts, they contain phytates that can bind magnesium in the digestive tract. Canned beans are typically pre-cooked and soaked during processing, which helps. If you cook dried beans yourself, soaking them overnight before cooking and discarding the soaking water will reduce phytate content and improve mineral absorption.

A Note on Absorption: Phytates and How to Work Around Them

Eating a food that contains 100 mg of magnesium does not guarantee your body absorbs all 100 mg. Bioavailability, the fraction that actually enters your bloodstream, varies based on the food's composition. The main factor reducing magnesium absorption in plant foods is phytic acid (phytate), a compound seeds and legumes use to store phosphorus. In the human gut, phytates bind to minerals including magnesium, calcium, iron, and zinc, forming insoluble complexes that pass through unabsorbed.

The good news is that several preparation techniques reliably reduce phytate content. Soaking grains, seeds, or legumes in water activates the enzyme phytase, which breaks down phytic acid. Sprouting (germination) is even more effective. Fermentation, as in sourdough bread, also degrades phytates significantly. Traditional food cultures developed these techniques long before the science was understood, and they remain practical today.

Other Notable Sources: Fish, Fruit, and Whole Grains

Dark chocolate (70-85% cacao) provides 50 mg per ounce, making it one of the more enjoyable ways to add magnesium to your diet. The higher the cacao percentage, the more magnesium, since cocoa solids are the source. Milk chocolate and white chocolate have minimal amounts.

Salmon delivers 53 mg per 3-ounce serving of cooked fish, and unlike plant sources, it has zero phytates, so bioavailability is straightforward. Fatty fish in general are reliable magnesium sources alongside their omega-3 content.

Brown rice contributes 42 mg per cooked cup, compared to roughly 19 mg per cup of white rice. Most of the magnesium in rice is stored in the bran and germ layers, which are removed during the milling process that produces white rice. The same principle applies to whole wheat flour versus white flour.

Avocado is unusual among fruits for its mineral density, with a whole medium avocado providing 58 mg of magnesium. Banana adds 32 mg per medium fruit, and while that is not dramatic on its own, bananas are eaten frequently and contribute meaningfully to cumulative daily intake.

Can You Meet Your Magnesium RDA Through Food Alone?

For most healthy adults eating a varied, minimally processed diet, the answer is yes. The male RDA of 420 mg/day and the female RDA of 310 mg/day are achievable through food, but it requires some intentionality. The problem is that about 48% of Americans fall short, primarily because of diets heavy in refined grains, processed foods, and sugar, all of which displace magnesium-rich whole foods.

Certain groups find it harder to meet the RDA through food alone. People with type 2 diabetes often excrete more magnesium through the kidneys. Those taking proton pump inhibitors (PPIs) for acid reflux or diuretics for blood pressure can develop clinically significant depletion. Older adults absorb less magnesium from the gut. For these populations, dietary optimization is the right starting point, but supplementation is sometimes medically indicated.

If you are wondering whether you might be falling short, the symptoms are often subtle at first. Read our guide on signs of magnesium deficiency and our broader article on magnesium deficiency for a clinical picture of what low magnesium looks like over time.

A Sample Day of Magnesium-Rich Eating

The following timeline shows how a practical, realistic day of eating can accumulate enough magnesium from food alone. The amounts are based on the USDA values in the table above. Total for the day: approximately 390-420 mg, meeting or approaching the male RDA and exceeding the female RDA.

When Food Is Not Enough: A Practical Framework

If you consistently eat magnesium-rich foods and still experience symptoms like muscle cramps, poor sleep, or persistent fatigue, dietary intake might not be the only factor. Absorption issues (celiac disease, Crohn's, chronic diarrhea), medication interactions, or elevated physiological demand (intense endurance exercise, chronic stress) can all widen the gap between what you eat and what your body retains.

In these cases, a targeted supplement can be a useful tool. Not all magnesium supplements are equal, however. Magnesium oxide, the most common form sold in pharmacies, has an absorption rate of only about 4%. Chelated forms like magnesium glycinate absorb at 80%+, and magnesium citrate absorbs at 30-45%. For a full breakdown of which form to choose, see our guide to magnesium supplement forms. To understand the numbers behind how much to take, read our article on how much magnesium per day.

The upper tolerable intake level for supplemental magnesium is 350 mg/day for adults. This limit does not apply to magnesium from food, since the kidneys efficiently excrete any excess from dietary sources. Taking more than 350 mg from supplements without medical supervision can cause osmotic diarrhea and, in rare cases with very high doses, more serious effects.

Summary by Food Group: Where to Focus

Rather than memorizing every food individually, thinking by category makes it easy to build a magnesium-rich diet intuitively.

• Seeds: The highest concentration of any food group. Pumpkin seeds and chia seeds are exceptional. Add to breakfast, yogurt, or salads.
• Nuts: Almonds and cashews are practical everyday snacks. Buy in bulk and portion by the ounce to track intake.
• Dark leafy greens: Cook them to get the density benefit. Spinach, Swiss chard, and beet greens lead the category.
• Legumes: Black beans, edamame, lentils, and chickpeas. Inexpensive, high in fiber and protein, and batch-cook well.
• Whole grains: Brown rice and whole wheat products over white. The difference in magnesium content per serving is significant.
• Fish: Salmon and other fatty fish add magnesium with no phytate concerns. A twice-weekly serving contributes meaningfully.
• Dark chocolate: A legitimate nutritional food in small quantities. Choose 70%+ cacao for the most magnesium.
• Fruits: Avocado and banana stand out, but most fruits are minor contributors. Do not rely on fruit alone for magnesium.

If you are building a complete picture of your magnesium health, understanding how much magnesium per day you actually need is the logical next step after knowing which foods provide it. And if you are experiencing symptoms that suggest you might already be running low, the guide to signs of magnesium deficiency covers the clinical picture in detail.