| Total essential vitamins | 13 (4 fat-soluble, 9 water-soluble) |
| Essential minerals (major + trace) | Approximately 16 recognized as essential |
| Most common deficiency in the US | Vitamin D and iron are among the most frequently low (CDC National Report on Biochemical Indicators of Diet and Nutrition) |
| Best general source of micronutrients | A varied whole-foods diet covering all food groups |
| Supplement guidance | Consult a healthcare provider before starting any supplement |
Why Vitamins and Minerals Matter
Vitamins and minerals are often called micronutrients — tiny compared to carbohydrates, proteins, and fats, but absolutely essential for your body to function. They keep your immune system alert, help convert food into usable energy, support bone strength, and regulate hundreds of chemical processes happening inside you right now.
Unlike macronutrients, your body cannot manufacture most vitamins and minerals on its own in meaningful amounts. That means you need to get them consistently through food — or, in some cases, a supplement under a healthcare provider's guidance.
This guide is a plain-language lookup reference. It is not medical advice, and it is not a substitute for a conversation with a registered dietitian or your doctor about your personal nutrition needs.
| Total essential vitamins | 13 (4 fat-soluble, 9 water-soluble) |
| Essential minerals (major + trace) | Approximately 16 recognized as essential |
| Most common deficiency in the US | Vitamin D and iron are among the most frequently low (CDC National Report on Biochemical Indicators of Diet and Nutrition) |
| Best general source of micronutrients | A varied whole-foods diet covering all food groups |
| Supplement guidance | Consult a healthcare provider before starting any supplement |
The Vitamins: What Each One Does
Vitamins fall into two categories. Fat-soluble vitamins (A, D, E, and K) are stored in body fat and liver tissue, so they accumulate over time. Water-soluble vitamins (C and the B vitamins) are not stored in the same way — excess amounts are generally flushed out, which means you need them more regularly through your diet.
Micronutrients
Vitamins and minerals needed by the body in small amounts to support growth, energy production, and overall health. Unlike macronutrients, they provide no calories but are essential for function.
Fat-soluble vitamins
Vitamins A, D, E, and K, which dissolve in fat and are stored in body tissue. Because they accumulate, very high supplemental doses over time can cause problems — another reason to consult a professional.
Water-soluble vitamins
Vitamin C and the eight B vitamins. These dissolve in water and are not significantly stored, so regular dietary intake is important. Excess amounts are typically excreted in urine.
Antioxidant
A compound that helps protect cells from oxidative damage caused by unstable molecules called free radicals. Several vitamins, including C and E, act as antioxidants.
Heme iron
A form of iron found in animal foods like red meat and shellfish that the body absorbs more readily than the non-heme iron found in plant foods.
Daily Value (DV)
A reference figure set by the FDA representing the recommended daily intake of a nutrient for the general population. Shown as a percentage on US nutrition labels.
Fat-Soluble Vitamins
- Vitamin A — Supports vision (especially in low light), immune defense, and skin cell renewal. Found in liver, dairy, eggs, and orange-yellow produce like carrots and sweet potatoes.
- Vitamin D — Helps your body absorb calcium and supports bone density and immune function. Fatty fish, egg yolks, and fortified dairy or plant milks are food sources; sunlight also triggers its production in skin.
- Vitamin E — Acts as an antioxidant, protecting cells from damage. Sunflower seeds, almonds, and vegetable oils are reliable sources.
- Vitamin K — Essential for blood clotting and bone metabolism. Leafy greens like kale, spinach, and broccoli provide the most.
Water-Soluble Vitamins
- Vitamin C — Builds collagen, supports wound healing, and boosts immune function. Citrus fruit, bell peppers, and strawberries are excellent sources.
- B vitamins (B1–B12) — This family of eight vitamins collectively helps convert food into energy, supports nerve function, and assists red blood cell production. Whole grains, legumes, meat, fish, dairy, and leafy greens cover most of them. Vitamin B12 is found almost exclusively in animal products, so people following a plant-based diet may need to monitor their intake carefully — speak with a healthcare provider.
For more context on how these nutrients work alongside the food you eat, our guide on reading a nutrition label can help you spot them on packaged foods.
Key Minerals and Where to Find Them
Minerals are inorganic elements — they come from the earth and make their way into food through soil and water. Like vitamins, they each serve distinct roles.
42%
US adults with vitamin D insufficiency
According to data published in the journal Nutrients drawing on NHANES survey results.
10%
US women of childbearing age with iron deficiency
Estimate from CDC national nutrition surveillance data.
- Calcium — The most abundant mineral in the body. Critical for bone and teeth structure, muscle contraction, and nerve signaling. Dairy products, fortified plant milks, tofu made with calcium sulfate, and leafy greens are all sources.
- Iron — Carries oxygen through the blood via hemoglobin. Red meat and shellfish provide heme iron, which absorbs efficiently. Beans, lentils, and fortified cereals provide non-heme iron, which absorbs better when paired with a source of vitamin C.
- Magnesium — Supports muscle and nerve function, blood sugar regulation, and protein synthesis. Nuts, seeds, whole grains, and leafy greens are good sources.
- Potassium — Helps regulate fluid balance, blood pressure, and heart rhythm. Bananas, potatoes, beans, and yogurt are commonly cited sources.
- Zinc — Involved in immune function, wound healing, and taste and smell. Meat, shellfish, legumes, seeds, and nuts all contribute.
- Sodium — Necessary for fluid balance and nerve transmission, though most Americans consume more than general guidance suggests. Most dietary sodium comes from processed and restaurant foods.
- Iodine — Needed for thyroid hormone production, which regulates metabolism. Iodized salt and seafood are the primary sources in the US.
Pairing a variety of whole foods across your week is one of the most practical ways to cover these bases — a concept worth exploring in our weekly grocery audit guide.
This article is for general informational and educational purposes only and is not a substitute for professional medical or nutritional advice. Please consult a qualified healthcare provider or registered dietitian before making significant changes to your diet or taking supplements.
