Micronutrients at a Glance: A Plain-Language Reference to Vitamins and Minerals
| Total essential vitamins | 13 (4 fat-soluble, 9 water-soluble) (National Institutes of Health, Office of Dietary Supplements) |
| Essential dietary minerals | At least 16 recognized (National Institutes of Health) |
| Most common U.S. deficiency | Vitamin D (CDC Second National Report on Biochemical Indicators of Diet and Nutrition) |
| Iron deficiency anemia prevalence | Affects roughly 10 million Americans (American Society of Hematology) |
| Folate importance in pregnancy | Reduces neural tube defect risk when adequate before and early in pregnancy (CDC, Folic Acid recommendations) |
| B12 absorption challenge | Absorption declines with age; older adults often need supplemental or fortified sources (National Institutes of Health, Office of Dietary Supplements) |
What Micronutrients Are — and Why They Matter
Micronutrients are the vitamins and minerals your body needs in relatively small amounts to function properly. Unlike macronutrients like carbs, protein, and fat, micronutrients don't supply calories — but they're no less essential. They drive hundreds of biological processes, from converting food into energy to keeping bones dense and immune defenses strong.
Most Americans can meet their micronutrient needs through a well-varied diet, but gaps are common. Life gets busy, food choices narrow, and certain life stages or health conditions can increase specific needs. This reference is designed to give you a plain-language snapshot of the key players — what each one does, where to find it in food, and what goes wrong when the body runs short.
This article is for general educational purposes and is not a substitute for personalized medical or dietary advice. If you have concerns about your nutritional status, consult a registered dietitian or your healthcare provider.
| Total essential vitamins | 13 (4 fat-soluble, 9 water-soluble) (National Institutes of Health, Office of Dietary Supplements) |
| Essential dietary minerals | At least 16 recognized (National Institutes of Health) |
| Most common U.S. deficiency | Vitamin D (CDC Second National Report on Biochemical Indicators of Diet and Nutrition) |
| Iron deficiency anemia prevalence | Affects roughly 10 million Americans (American Society of Hematology) |
| Folate importance in pregnancy | Reduces neural tube defect risk when adequate before and early in pregnancy (CDC, Folic Acid recommendations) |
| B12 absorption challenge | Absorption declines with age; older adults often need supplemental or fortified sources (National Institutes of Health, Office of Dietary Supplements) |
The Essential Vitamins: A Quick-Reference Guide
Vitamins fall into two broad families: fat-soluble (A, D, E, K) and water-soluble (the B vitamins and C). Fat-soluble vitamins are stored in body tissue, so excess intake can accumulate; water-soluble vitamins are excreted more readily, but consistent intake is still important.
Micronutrients
Vitamins and minerals the body needs in small amounts to support essential biological functions. Unlike macronutrients, they provide no calories but are critical for health.
Fat-soluble vitamins
Vitamins A, D, E, and K, which are absorbed alongside dietary fat and stored in body tissue. Because they can accumulate, very high intakes from supplements carry risk.
Water-soluble vitamins
The B vitamins and vitamin C, which dissolve in water and are not stored in significant amounts. Regular dietary intake is needed to maintain adequate levels.
Trace minerals
Minerals such as iron, zinc, iodine, and selenium that the body requires in very small quantities. Despite the small amounts needed, deficiencies can have significant health consequences.
Daily Value (% DV)
A reference number used on U.S. nutrition labels showing how much a nutrient in one serving contributes to a standard 2,000-calorie daily diet. It helps compare nutrient levels across foods at a glance.
Antioxidant
A compound that helps neutralize unstable molecules called free radicals, which can damage cells. Vitamins C and E and the mineral selenium all have antioxidant roles.
Fat-Soluble Vitamins
- Vitamin A — Supports vision (especially night vision), immune response, and skin cell turnover. Found in liver, dairy, eggs, and as beta-carotene in orange and leafy green vegetables. Deficiency can impair night vision and immune function.
- Vitamin D — Regulates calcium absorption and plays a key role in bone density and immune signaling. Produced by skin on sun exposure; dietary sources include fatty fish, fortified dairy, and egg yolks. Deficiency is common and linked to weakened bones and compromised immunity.
- Vitamin E — An antioxidant that helps protect cells from oxidative damage and supports immune function. Found in nuts, seeds, vegetable oils, and leafy greens.
- Vitamin K — Critical for blood clotting and bone metabolism. K1 is abundant in leafy greens; K2 is found in fermented foods and some animal products.
Water-Soluble Vitamins
- Vitamin C — Supports collagen production, wound healing, and immune defense; also enhances iron absorption from plant foods. Citrus fruits, bell peppers, and broccoli are rich sources.
- B Vitamins (B1, B2, B3, B5, B6, B7, B9, B12) — This group drives energy metabolism, red blood cell formation, nervous system function, and DNA synthesis. Folate (B9) is especially important during pregnancy. Sources vary widely: whole grains, legumes, meat, dairy, eggs, and leafy greens collectively cover most B vitamins. Vegans and older adults are at higher risk for B12 deficiency because B12 is found almost exclusively in animal products.
Key Minerals: What They Do and Where to Find Them
Minerals are inorganic elements that the body cannot produce on its own. They're divided into major minerals (needed in larger amounts, such as calcium and magnesium) and trace minerals (needed in smaller amounts, such as iron and zinc). Both categories are equally important — the distinction is quantity, not priority.
Major Minerals
- Calcium — Best known for bone and tooth strength, but also essential for muscle contraction and nerve signaling. Dairy products, fortified plant milks, tofu made with calcium sulfate, and leafy greens are reliable sources.
- Magnesium — Involved in over 300 enzyme reactions, including energy production, muscle and nerve function, and blood sugar regulation. Found in nuts, seeds, legumes, whole grains, and dark chocolate.
- Potassium — Helps regulate fluid balance, blood pressure, and muscle contractions. Bananas often get the headlines, but beans, potatoes, and leafy greens are even richer sources.
- Sodium — Necessary for fluid balance and nerve function, though most Americans consume significantly more than needed. Excess is associated with elevated blood pressure in susceptible individuals.
Trace Minerals
- Iron — Carries oxygen in red blood cells. Heme iron (from meat) is absorbed more readily than non-heme iron (from plants); pairing plant iron sources with vitamin C improves absorption. Deficiency causes fatigue and anemia.
- Zinc — Supports immune function, wound healing, and taste and smell perception. Found in meat, shellfish, legumes, and pumpkin seeds.
- Iodine — Required for thyroid hormone production, which governs metabolism. Iodized salt and seafood are primary sources; deficiency can impair thyroid function.
- Selenium — An antioxidant mineral that supports thyroid function and immune health. Brazil nuts are an exceptionally concentrated source; seafood and whole grains also contribute.
To see how these nutrients fit into everyday eating, review a week of nutritionally balanced eating for practical day-by-day guidance.
~42%
U.S. adults with vitamin D insufficiency
According to research published in Nutrition Research using NHANES data, approximately 42% of American adults have insufficient vitamin D levels.
90%
Americans not meeting potassium recommendations
The Dietary Guidelines for Americans identifies potassium as a nutrient of public health concern due to widespread under-consumption.
300+
Enzyme reactions involving magnesium
Magnesium serves as a cofactor in more than 300 enzymatic processes, according to the National Institutes of Health Office of Dietary Supplements.
Putting It Into Practice
No single food delivers every micronutrient your body needs — variety is the practical strategy. Eating a wide range of vegetables, fruits, whole grains, legumes, nuts, seeds, and lean proteins gives you the broadest micronutrient coverage without needing to track individual nutrients obsessively.
Nutrition labels can help you gauge how well your daily choices are hitting common micronutrient targets. Our guide on reading a nutrition label without getting confused walks through what the percent daily values (% DV) for vitamins and minerals actually mean in real terms.
If you're new to thinking about diet quality more broadly, start with the fundamentals of eating well before diving into specific nutrient details.
A few groups face elevated risk for specific deficiencies and should discuss their needs with a healthcare provider: pregnant individuals (folate, iron, iodine), older adults (B12, vitamin D, calcium), people who follow plant-based diets (B12, iron, zinc, calcium, iodine), and those with certain digestive conditions that affect absorption. Supplementation may be appropriate in these cases, but dosage and type should be guided by a professional rather than self-selected.
This content is for general informational purposes only and does not constitute medical or dietary advice. Always consult a qualified healthcare professional before making changes to your diet or supplement routine.