Why Vitamins and Minerals Matter
If you've ever flipped over a food package and felt overwhelmed by the long list of nutrients, you're not alone. Vitamins and minerals — collectively called micronutrients — are substances your body needs in small amounts to function properly. Unlike carbohydrates, proteins, and fats, micronutrients don't supply energy directly; instead, they power the processes that keep your body running. To understand how micronutrients fit into the bigger nutrition picture, see our overview of macronutrients and micronutrients.
There are two broad categories of vitamins: fat-soluble (A, D, E, and K), which the body can store in fatty tissue, and water-soluble (C and the eight B vitamins), which are not stored in significant quantities and need regular replenishment through food. Minerals are inorganic elements — like calcium, iron, and potassium — that support everything from bone strength to fluid balance.
| Number of recognized vitamins | 13 (4 fat-soluble, 9 water-soluble) |
| Essential major minerals | Calcium, phosphorus, magnesium, sodium, potassium, chloride, sulfur |
| Fat-soluble vitamins | A, D, E, K |
| Water-soluble vitamins | C, B1, B2, B3, B5, B6, B7, B9, B12 |
| Primary source of most vitamins and minerals | Whole foods (fruits, vegetables, grains, proteins, dairy) |
Key Vitamins: Functions and Food Sources
The table below summarizes the most commonly discussed vitamins, what each one does, and which everyday foods supply it. This is general reference information — individual needs vary, and a qualified healthcare professional can help you understand your personal requirements.
Micronutrient
A nutrient required by the body in small quantities to support normal biological functions. Vitamins and minerals are both micronutrients.
Fat-soluble vitamin
A vitamin that dissolves in fat and can be stored in the body's fatty tissue and liver. Vitamins A, D, E, and K are fat-soluble.
Water-soluble vitamin
A vitamin that dissolves in water and is not stored in significant amounts; excess is typically excreted in urine. Vitamin C and the B vitamins are water-soluble.
Trace mineral
A mineral the body needs in very small amounts — typically less than 100 mg per day — such as iron, zinc, and selenium.
Daily Value (%DV)
A reference amount used on US food labels to indicate how much of a nutrient a single serving provides relative to a general daily intake target.
Antioxidant
A compound that helps protect cells from damage caused by unstable molecules called free radicals. Several vitamins, including C and E, act as antioxidants.
| Vitamin | Primary Function | Common Food Sources |
|---|---|---|
| Vitamin A | Supports vision, immune defense, and skin health | Carrots, sweet potatoes, spinach, dairy, eggs |
| Vitamin C | Antioxidant; supports immune function and collagen production | Citrus fruits, bell peppers, strawberries, broccoli |
| Vitamin D | Helps absorb calcium; supports bone health and immune function | Fatty fish, fortified milk, eggs; also synthesized from sunlight |
| Vitamin E | Antioxidant; supports cell protection | Nuts, seeds, vegetable oils, leafy greens |
| Vitamin K | Essential for blood clotting and bone metabolism | Kale, spinach, broccoli, Brussels sprouts |
| B Vitamins (group) | Energy metabolism, nerve function, red blood cell production | Whole grains, legumes, meat, dairy, leafy greens |
You'll often see vitamins listed as a percentage of the Daily Value (%DV) on food labels. Our guide to reading the Nutrition Facts label explains exactly how to use those numbers.
Essential Minerals: Functions and Food Sources
Minerals are divided into two groups based on how much your body needs: major minerals (needed in larger amounts, such as calcium and magnesium) and trace minerals (needed in smaller amounts, such as iron and zinc).
~40%
U.S. adults with potential vitamin D insufficiency
National Health and Nutrition Examination Survey (NHANES) data has consistently shown low vitamin D levels in a significant portion of U.S. adults.
13
Essential vitamins the human body requires
Established nutritional science identifies 13 vitamins as essential to human health, each with distinct functions.
| Mineral | Primary Function | Common Food Sources |
|---|---|---|
| Calcium | Builds and maintains bones and teeth; supports muscle and nerve function | Dairy products, fortified plant milks, tofu, leafy greens |
| Iron | Carries oxygen in the blood; supports energy production | Red meat, beans, lentils, fortified cereals, spinach |
| Magnesium | Supports muscle function, blood pressure regulation, and energy use | Nuts, seeds, whole grains, legumes, dark chocolate |
| Potassium | Regulates fluid balance and blood pressure; supports heart function | Bananas, potatoes, beans, yogurt, leafy greens |
| Zinc | Supports immune function, wound healing, and taste/smell | Meat, shellfish, legumes, nuts, seeds |
| Sodium | Regulates fluid balance and nerve signaling | Table salt, processed foods, bread, canned goods |
Eating a variety of whole foods — vegetables, fruits, proteins, and whole grains — is generally the most effective way to cover your mineral needs. For practical guidance, see what a balanced plate actually looks like and how to build a grocery list around nutritional balance.
This article is for general informational purposes only and is not a substitute for personalized medical or dietary advice. Consult a qualified healthcare professional before making significant changes to your diet or taking supplements.
