The 13 essential minerals most commonly referenced in nutrition are calcium, phosphorus, magnesium, sodium, potassium, iron, zinc, iodine, selenium, copper, manganese, chromium, and molybdenum. These are the minerals with established recommended intakes from the National Institutes of Health. Some sources count as many as 16 by adding chloride, sulfur, and fluoride, which also play important roles but are rarely lacking in typical diets.
These 13 minerals split into two groups based on how much your body needs: macrominerals (measured in hundreds of milligrams per day) and trace minerals (measured in micrograms or single-digit milligrams). Both groups are equally essential for survival, just required in different quantities.
The 5 Macrominerals
Calcium is the most abundant mineral in your body, with nearly all of it stored in bones and teeth. It gives your skeleton its rigid structure by forming a crystal called hydroxyapatite within the bone matrix. Beyond that, the small amount circulating in your blood is tightly regulated because it controls muscle contraction, nerve signaling, and blood clotting. Adults need about 1,000 mg per day. The best sources are yogurt, cheese, milk, salmon, and leafy green vegetables.
Phosphorus works alongside calcium in bone, making up the other half of that mineral crystal. It also plays a central role in energy production: every cell in your body uses a phosphorus-containing molecule to store and transfer energy. The recommended intake is 700 mg per day, and most people get plenty from meat, dairy, fish, and whole grains.
Magnesium is involved in over 300 enzyme reactions, influencing everything from protein building to blood sugar control to muscle and nerve function. Men need about 420 mg daily, women about 320 mg. Spinach, broccoli, legumes, seeds, and whole-wheat bread are reliable sources. Magnesium is one of the more commonly under-consumed minerals in Western diets.
Sodium and potassium work as a pair. Cells throughout your body use a pump that pushes three sodium ions out of the cell while pulling two potassium ions in. This constant exchange creates an electrical charge across every cell membrane, which is what allows your nerves to fire, your heart to beat rhythmically, and your muscles to contract on command. The same pump also prevents cells from swelling and bursting by keeping osmotic pressure in balance. Sodium is abundant in salt and processed foods (most people get more than enough), while potassium comes from meat, milk, fruits, vegetables, and legumes.
The 8 Trace Minerals
Iron is the oxygen carrier. It sits at the center of hemoglobin in your red blood cells and myoglobin in your muscles, binding oxygen in the lungs and releasing it where your tissues need it. Men need about 8 mg per day. Women of reproductive age need 18 mg because of menstrual blood loss, making iron deficiency the most common nutrient deficiency worldwide. Red meat, beans, fortified cereals, and spinach are go-to sources. The tolerable upper limit for adults is 45 mg per day.
Zinc is required for the activity of hundreds of enzymes. It supports immune function by maintaining the barrier tissues in your gut and promoting the adaptive immune response. It also plays roles in DNA synthesis, wound healing, and cell division. Men need 11 mg daily, women 8 mg. Meat, shellfish (especially oysters), legumes, nuts, and seeds are the richest food sources. The upper limit is 40 mg per day for adults, and chronic over-supplementation can actually suppress immune function by interfering with copper absorption.
Iodine is a building block of thyroid hormones, which regulate your metabolic rate, body temperature, and growth. Without enough iodine, the thyroid gland enlarges (a condition called goiter) as it tries to compensate. The recommended intake is 150 micrograms per day, easily met through iodized salt, dairy, seafood, and seaweed. The upper limit is 1,100 micrograms.
Selenium works closely with iodine in thyroid health. It’s needed by enzymes that convert thyroid hormones into their active form. It also functions as a powerful antioxidant through its role in an enzyme that neutralizes damaging peroxides in cells. Adults need 55 micrograms per day. Brazil nuts are the single most concentrated food source (just one or two nuts can meet your daily need), followed by seafood, meat, and eggs. The upper limit is 400 micrograms, and toxicity from over-supplementation can cause hair loss, brittle nails, and nausea.
Copper participates in energy production and helps your body absorb and use iron. A copper deficiency can mimic iron deficiency because without copper, iron gets trapped in storage and can’t be mobilized into red blood cells. Adults need 900 micrograms daily from foods like shellfish, nuts, seeds, organ meats, and dark chocolate. The upper limit is 10,000 micrograms (10 mg).
Manganese activates a large number of enzymes and is involved in carbohydrate metabolism, bone formation, and the regulation of brain chemicals. Men need 2.3 mg per day, women 1.8 mg. Whole grains, nuts, leafy vegetables, and tea provide it. The upper limit is 11 mg.
Chromium enhances the action of insulin, the hormone that moves blood sugar into cells. It functions as a potentiator, meaning insulin-dependent reactions work better when chromium levels are adequate. Men need about 35 micrograms per day, women 25 micrograms. Meat, poultry, fish, nuts, and cheese are good sources. No tolerable upper limit has been established because toxicity from food sources has not been documented.
Molybdenum is the least discussed of the 13 but still essential. It activates enzymes involved in breaking down sulfur-containing amino acids and certain toxins. The recommended intake is 45 micrograms per day for both men and women, with an upper limit of 2,000 micrograms. Legumes, grains, and nuts are the main dietary sources. Deficiency is extremely rare.
What About Chloride, Sulfur, and Fluoride?
These three minerals appear on some “essential minerals” lists but are often left off the count of 13 because deficiency is virtually nonexistent. Chloride pairs with sodium in table salt and helps produce stomach acid. Sulfur comes packaged in protein-rich foods and is a structural component of certain amino acids. Fluoride strengthens tooth enamel and makes bone mineral less susceptible to breakdown, but it’s classified more as a beneficial element than a strictly essential one. Most people get adequate amounts of all three without thinking about it.
Factors That Affect Mineral Absorption
Getting enough minerals from food isn’t just about eating the right amounts. Certain plant compounds can bind to minerals in your digestive tract and reduce how much your body actually absorbs. Phytates (found in whole grains, legumes, and nuts) and oxalates (found in spinach, rhubarb, and beets) are the most significant. This means that the iron or calcium listed on a nutrition label for a plant food may overstate what your body actually takes in.
Cooking, soaking, and fermenting foods breaks down these compounds and improves absorption. Pairing iron-rich plant foods with a source of vitamin C also helps, because vitamin C converts iron into a form that your gut absorbs more efficiently. On the other hand, calcium and iron compete for the same absorption pathways, so taking both as supplements at the same time reduces the uptake of each.
Risks of Over-Supplementation
More is not better with minerals. Unlike water-soluble vitamins, which your body can flush out through urine, excess minerals accumulate in tissues. Iron is one of the riskiest to over-supplement: the upper limit for adults is just 45 mg, and exceeding it regularly can damage the liver and other organs. Zinc above 40 mg per day can cause nausea, suppress immune function, and deplete copper stores. Even calcium, which many people supplement freely, has an upper limit of 2,500 mg per day, above which kidney stones and cardiovascular concerns become relevant.
For most people eating a varied diet that includes vegetables, whole grains, protein sources, and dairy or fortified alternatives, supplementation of individual minerals is unnecessary. The exceptions tend to be iron for menstruating women, calcium and magnesium for people who avoid dairy, iodine for those who don’t use iodized salt, and zinc for strict vegetarians whose plant-heavy diets are high in phytates.