Micronutrients: The Vitamins and Minerals Your Body Can't Make on Its Own

What Are Micronutrients?

Your body needs two broad categories of nutrients to function: macronutrients — carbohydrates, protein, and fat — and micronutrients, which are vitamins and minerals. While macronutrients supply energy, micronutrients drive the chemical reactions that keep every cell, organ, and system running. See our guide to macronutrients for a comparison of how the two categories work together.

The defining feature of a micronutrient is that your body cannot synthesize enough of it on its own — or cannot make it at all — so it must come from food. Despite being needed in relatively small amounts, a shortfall of even one micronutrient can affect energy, immunity, bone density, nerve function, and more.

Micronutrients fall into two main groups: vitamins (organic compounds) and minerals (inorganic elements). Vitamins are further divided by how the body stores them — fat-soluble or water-soluble — which affects how much you need each day and how excess amounts are handled.

Fat-Soluble vs. Water-Soluble Vitamins

Fat-soluble vitamins — A, D, E, and K — dissolve in fat and are stored in body tissues, particularly the liver. Because they accumulate, they don't need to be consumed every single day, but excessive supplementation can lead to toxicity over time.

Water-soluble vitamins — the eight B vitamins and vitamin C — dissolve in water and are not stored in significant quantities. Excess amounts are generally excreted in urine, which means you need regular dietary intake but also that overdose from food alone is rare.

Key fat-soluble vitamins and their primary food sources:

• Vitamin A: Liver, eggs, dairy, and orange-yellow produce (carrots, sweet potatoes, cantaloupe)
• Vitamin D: Fatty fish, egg yolks, fortified milk; the skin also produces it from sunlight exposure
• Vitamin E: Sunflower seeds, almonds, vegetable oils, and leafy greens
• Vitamin K: Leafy greens like kale, spinach, and broccoli; also found in fermented foods

Key water-soluble vitamins and their primary food sources:

• Vitamin C: Citrus fruits, bell peppers, strawberries, kiwi, and broccoli
• B12: Meat, fish, shellfish, eggs, and dairy; plant-based eaters should pay close attention to this one
• Folate (B9): Dark leafy greens, legumes, fortified grains, and citrus
• B6: Poultry, fish, potatoes, and non-citrus fruits

Essential Minerals: What They Do and Where to Find Them

Minerals are inorganic elements the body uses for structure (bones and teeth), fluid balance, nerve signaling, and hundreds of enzyme reactions. They're divided into macrominerals — needed in larger amounts — and trace minerals, needed in smaller quantities but no less important.

Key macrominerals:

• Calcium: Critical for bone and tooth density, muscle contraction, and nerve signaling. Found in dairy, fortified plant milks, sardines, and kale.
• Magnesium: Involved in over 300 enzyme reactions, including energy production and blood pressure regulation. Found in nuts, seeds, whole grains, and dark chocolate.
• Potassium: Helps maintain healthy blood pressure and fluid balance. Found in bananas, potatoes, beans, and leafy greens.

Key trace minerals:

• Iron: Essential for making hemoglobin, which carries oxygen in red blood cells. Found in red meat, shellfish, lentils, and fortified cereals. Pairing plant-based iron sources with vitamin C improves absorption.
• Zinc: Supports immune function, wound healing, and DNA synthesis. Found in oysters, beef, pumpkin seeds, and legumes.
• Iodine: Necessary for thyroid hormone production. Found in seafood, dairy, and iodized salt.
• Selenium: Acts as an antioxidant and supports thyroid health. Brazil nuts are an especially concentrated source; it also appears in fish, eggs, and whole grains.

When you read a Nutrition Facts label, the % Daily Value figures you see for vitamins and minerals reflect government-established reference amounts for healthy adults. Our guide to reading nutrition labels explains exactly how to interpret those numbers in context.

Getting Enough Without Overdoing It

For most healthy adults, a varied diet built around whole foods — vegetables, fruits, whole grains, legumes, nuts, lean proteins, and dairy or fortified alternatives — provides adequate micronutrients without supplementation. Restrictive diets, certain health conditions, pregnancy, and older age can create genuine gaps, but this is something to evaluate with a healthcare provider rather than address through guesswork.

Supplements can play a role in specific, clinically identified deficiencies, but they are not a substitute for dietary variety, and more is not always better. Fat-soluble vitamins in particular can accumulate to harmful levels when taken in high doses over time. Common nutrition claims — including the idea that megadosing certain vitamins is protective — often outrun the evidence.

If you suspect a deficiency, a blood test ordered by a clinician is the most reliable way to identify it and determine the right course of action. Self-diagnosing and supplementing without guidance can mask underlying conditions or create new imbalances.

This article is for general informational and educational purposes only and is not a substitute for professional medical or dietary advice. If you have questions about your nutritional needs or health status, consult a qualified healthcare provider.