Micronutrients: The Vitamins and Minerals Your Body Cannot Do Without

A clear reference to key vitamins and minerals, what each one does, and where to find them in everyday foods.

What micronutrients are and why they matter

Macronutrients (protein, carbohydrates, and fat) get most of the attention in nutrition conversations, but micronutrients are what allow those macronutrients to actually do their jobs. Vitamins and minerals are the catalysts behind thousands of chemical reactions your body runs every hour, from converting food into usable energy to building bone and regulating mood.

The word "micro" refers to the amounts your body needs, not to their importance. Many are required in milligram or even microgram quantities, yet a shortfall of just one can create noticeable health effects over time. For a broader grounding in how all nutrients fit together, see our introduction to core nutrition concepts.

Key vitamins and what they do

Vitamins fall into two groups based on how your body stores them. Fat-soluble vitamins (A, D, E, and K) are absorbed alongside dietary fat and stored in body tissue, so they do not need to appear in every meal. Water-soluble vitamins (vitamin C and the eight B vitamins) are not stored in significant quantities, meaning your body discards excess in urine and relies on regular dietary intake.

Vitamin D stands out because the body can produce it when skin is exposed to UVB sunlight, yet deficiency is common in people who spend most of their time indoors or live at higher latitudes. Food sources include fatty fish, egg yolks, and fortified dairy products. The B vitamin folate matters especially during pregnancy, since adequate intake in early gestation is associated with a lower risk of neural tube defects; anyone who is pregnant or planning to become pregnant should discuss folate needs with a healthcare provider rather than relying on general guidance alone.

Essential minerals at a glance

Minerals are inorganic elements that come entirely from food and water; your body cannot make them. They split into two practical categories: macrominerals, needed in larger amounts (calcium, magnesium, phosphorus, potassium, sodium, chloride, and sulfur), and trace minerals, needed in smaller amounts (iron, zinc, iodine, selenium, copper, and manganese).

Calcium is the most abundant mineral in the body and is central to bone density, muscle contraction, and nerve signaling. Dairy products, fortified plant milks, tofu made with calcium sulfate, and leafy greens such as kale are reliable sources. Iron comes in two forms: heme iron from animal products, which the body absorbs more readily, and non-heme iron from plant sources such as lentils, beans, and spinach. Eating a vitamin C-rich food alongside non-heme iron sources can improve absorption. Magnesium, found in nuts, seeds, whole grains, and dark chocolate, supports hundreds of enzyme reactions including those involved in blood sugar regulation.

Staying well hydrated also affects mineral balance, since electrolytes like sodium and potassium are dissolved in body fluids. Understanding your hydration needs can help you see how water and minerals work together.

Getting enough through food

A varied diet built around whole foods covers most micronutrient needs for healthy adults without supplementation. Eating a wide range of vegetables across different colors is a practical shortcut because different pigments often correspond to different nutrient profiles: orange and yellow vegetables tend to be rich in beta-carotene (a precursor to vitamin A), while dark leafy greens provide folate, vitamin K, and calcium.

Certain groups face a higher risk of specific deficiencies. Older adults absorb vitamin B12 less efficiently. People following a strict plant-based diet may need to pay attention to vitamin B12, iron, zinc, iodine, and omega-3 fatty acids. People with digestive conditions that affect absorption (such as celiac disease or Crohn's disease) may have needs that a standard diet cannot meet without medical support.

If you have symptoms you suspect are related to a nutritional gap, a registered dietitian or physician can order blood tests to check levels and give guidance suited to your situation. General information about vitamins and minerals is a starting point, not a substitute for that conversation.

This article is for general informational purposes only and is not medical advice. Consult a qualified healthcare professional before making changes to your diet or taking supplements, especially if you have an existing health condition or are pregnant.