Your body requires 16 essential minerals to function properly, split into two groups based on how much you need each day. Seven are macrominerals, needed in larger amounts, and nine are trace minerals, needed in only tiny quantities. Both groups are equally important. A shortfall in any single mineral can disrupt everything from bone strength to brain function.
Macrominerals vs. Trace Minerals
The distinction between these two categories is purely about quantity, not importance. Macrominerals are the ones your body uses in amounts measured in hundreds or thousands of milligrams per day. The seven macrominerals are calcium, phosphorus, magnesium, sodium, potassium, chloride, and sulfur.
Trace minerals do their work in much smaller doses, sometimes just millionths of a gram. The nine trace minerals are iron, zinc, iodine, selenium, copper, manganese, fluoride, chromium, and molybdenum. You need far less of these, but running low on even one can cause serious problems.
What Each Macromineral Does
Calcium is the most abundant mineral in your body, and nearly all of it sits in your bones and teeth. Beyond structural support, calcium helps muscles contract, nerves send signals, and blood clot properly. Adults need about 1,000 mg per day, rising to 1,200 mg after age 50.
Phosphorus works alongside calcium in bones and teeth but also shows up in every cell in your body, where it helps maintain the balance between acids and bases. The recommended intake for adults is 700 mg per day.
Magnesium is involved in protein production, muscle and nerve function, and immune health. Men need about 420 mg daily; women need about 320 mg. Despite being widely available in food, magnesium is one of the minerals people most commonly fall short on.
Sodium, potassium, and chloride work as a team. These three minerals carry electrical charges when dissolved in your body’s fluids, making them electrolytes. Sodium sits primarily outside your cells, potassium primarily inside, and the two are constantly swapped back and forth through a molecular pump embedded in cell membranes. This exchange is what allows nerves to fire and muscles to contract. Chloride, found mainly in the fluid outside cells, helps maintain fluid balance and is a key ingredient in stomach acid. Most people get plenty of sodium and chloride through salt but may need to pay more attention to potassium from fruits, vegetables, and legumes.
Sulfur rounds out the macrominerals. It’s a component of protein molecules, particularly in amino acids that give structure to skin, hair, and nails. You generally get enough sulfur through any diet that includes adequate protein.
What Each Trace Mineral Does
Iron is part of hemoglobin, the molecule in red blood cells that carries oxygen from your lungs to every tissue in your body. It also plays a role in energy production. Premenopausal women need 18 mg per day because of menstrual blood loss. Men and postmenopausal women need only 8 mg.
Zinc supports a remarkable range of functions: wound healing, immune defense, taste perception, sperm production, fetal development, and the creation of proteins and genetic material. Men need 11 mg daily, women 8 mg. Low zinc can dull your sense of taste and smell, cause hair loss, or produce visible ridges in your nails.
Iodine is built into thyroid hormones, which regulate your metabolism, growth, and development. Adults need 150 micrograms per day. In places where iodine is scarce in the soil and diet, deficiency leads to goiters (an enlarged thyroid gland) and, during pregnancy, can impair a child’s brain development.
Selenium acts as an antioxidant, helping protect cells from damage. The recommended intake is 55 micrograms per day for adults. Copper supports iron metabolism and enzyme function, with a recommended intake of about 900 micrograms. Chromium works closely with insulin to regulate blood sugar levels. Manganese and molybdenum are components of various enzymes, and fluoride strengthens bones and tooth enamel, helping prevent cavities.
Best Food Sources
A varied diet that includes both animal and plant foods covers most mineral needs without much effort. Three cups of low-fat milk, for instance, provides a full day’s worth of calcium and phosphorus along with a significant share of potassium and magnesium. About three ounces of cooked lean beef delivers roughly half the daily need for selenium and is an excellent source of iron and zinc. Organ meats, eggs, and fish are also mineral-dense options.
Plant foods contribute heavily too, especially dark green leafy vegetables, legumes, nuts, seeds, and whole grains. There’s a catch, though. Grains, beans, and seeds contain a compound called phytic acid that binds to iron, zinc, calcium, magnesium, and manganese, making them harder for your body to absorb. Simple preparation steps reduce this effect significantly. Soaking grains or beans before cooking, for example, has been shown to increase the availability of iron and zinc by up to 23%. Sprouting and fermenting (as in sourdough bread) also help break down phytic acid.
If you eat a mostly plant-based diet, pairing iron-rich foods with a source of vitamin C improves absorption. Tannins in tea and coffee can also reduce iron uptake, so spacing those drinks away from meals makes a practical difference.
What Happens When You Fall Short
Mineral deficiencies range from subtle to severe. Early signs are often vague: fatigue, trouble concentrating, muscle cramps, or mood changes like irritability and anxiety. These symptoms overlap with many other conditions, which is part of why mineral deficiencies sometimes go unrecognized. One phenomenon researchers call “hidden hunger” is the experience of feeling hungrier than usual because your body is trying to compensate for missing nutrients by driving you to eat more.
Specific deficiencies produce more distinctive problems. Low calcium, copper, or phosphorus weakens bones over time and contributes to osteoporosis. Iron deficiency causes anemia, leaving you pale, exhausted, and short of breath. Iodine deficiency slows thyroid function, which can lead to weight gain, fatigue, and goiter. Low chromium can impair blood sugar regulation. Copper, iodine, and molybdenum deficiencies can each affect your mental state, showing up as depression or anxiety.
In children and during pregnancy, the stakes are higher. Mineral deficiencies during these windows can cause developmental delays, rickets (softened and weakened bones), growth problems, and lasting brain development issues. These effects are often irreversible, making adequate mineral intake during pregnancy and childhood especially critical.
Risks of Getting Too Much
More is not always better. Scientists have established tolerable upper intake levels for many minerals, meaning the maximum daily amount unlikely to cause harm. For adults, these caps include 2,500 mg per day for calcium, 400 micrograms for selenium, 4,000 mg for phosphorus, and 10 mg for fluoride. The upper limit for supplemental magnesium (not counting food) is 350 mg per day, above which digestive problems like diarrhea become common.
Iron is one of the most dangerous minerals to over-consume, particularly from supplements, because your body has no efficient way to excrete excess iron. High-dose zinc supplements can interfere with copper absorption, creating a secondary deficiency. Excess selenium causes a condition with symptoms including brittle nails, hair loss, and nerve damage. These risks almost always come from supplements rather than food, which is why getting your minerals from a varied diet is the safest approach.
Minerals That Might Be Essential
Beyond the established 16, a handful of ultra-trace elements sit in a gray area. Boron, silicon, vanadium, and nickel have all shown signs of playing beneficial roles in animal studies, and human subjects do show measurable responses to changes in dietary intake. However, no clear biological function has been confirmed for any of them in humans. The Institute of Medicine reviewed the evidence and concluded that the data were not strong enough to set recommended intakes for any of these elements. For now, they remain in the “possibly essential” category, with no dietary targets to aim for.