Micronutrients: The Vitamins and Minerals Your Body Can't Make Itself

What Are Micronutrients?

Micronutrients are the vitamins and minerals your body requires in relatively small amounts to carry out thousands of biological processes — from converting food into energy to maintaining bone density and supporting immune function. Unlike macronutrients like carbohydrates, protein, and fat, micronutrients do not supply calories, but they are every bit as essential to health.

The word "micro" refers to quantity, not importance. Your body typically needs milligrams or even micrograms of these compounds daily, yet a sustained shortfall can have meaningful consequences for how you feel and function.

Micronutrients fall into two broad families:

• Vitamins — organic compounds produced by plants and animals
• Minerals — inorganic elements found in soil and water that enter the food supply through plants and animals

For a broader look at how these fit into the overall picture of nutrition, see our introduction to core nutrition concepts.

Vitamins: Fat-Soluble vs. Water-Soluble

There are 13 vitamins recognized as essential for human health. How your body stores and uses them depends on whether they are fat-soluble or water-soluble.

Fat-Soluble Vitamins (A, D, E, K)

These dissolve in fat, are absorbed alongside dietary fat, and can be stored in the liver and fatty tissues for later use. Because they accumulate, consistently very high supplemental doses can cause toxicity — though dietary sources rarely reach problematic levels.

• Vitamin A — supports vision, immune defense, and cell growth; found in liver, dairy, eggs, and as beta-carotene in orange and dark-green vegetables
• Vitamin D — critical for calcium absorption and bone health; synthesized by skin on sun exposure and found in fatty fish and fortified foods
• Vitamin E — acts as an antioxidant protecting cell membranes; found in nuts, seeds, and vegetable oils
• Vitamin K — essential for blood clotting and bone metabolism; found in leafy greens and fermented foods

Water-Soluble Vitamins (B Complex and C)

These do not accumulate in significant amounts; excess is generally excreted in urine, making daily dietary intake important. The eight B vitamins work collectively to support energy metabolism, red blood cell production, and nervous system function. Vitamin C is a potent antioxidant that also supports collagen synthesis and iron absorption.

Key Minerals and What They Do

Minerals are divided into macrominerals — needed in larger amounts (calcium, phosphorus, magnesium, sodium, potassium, chloride, sulfur) — and trace minerals, needed in smaller amounts but no less essential (iron, zinc, iodine, selenium, copper, manganese, fluoride, chromium, molybdenum).

When you read a nutrition label, the % Daily Value listed for vitamins and minerals reflects how much of the recommended intake a single serving provides, making it a useful at-a-glance guide.

Getting Enough Micronutrients from Food

No single food contains every micronutrient in adequate amounts — dietary variety is genuinely the most reliable strategy. A few principles that nutrition scientists consistently support:

• Eat a spectrum of colors. Pigments in fruits and vegetables often signal distinct micronutrient and antioxidant profiles.
• Include both animal and plant sources (or thoughtfully planned plant-only sources) to cover nutrients like B12, heme iron, zinc, and omega-3s alongside plant-exclusive phytonutrients.
• Don't avoid whole food groups without understanding the nutritional trade-offs and how to compensate.
• Consider cooking methods. Some vitamins — particularly water-soluble ones like C and folate — degrade with heat. Steaming or eating certain foods raw preserves more of their content.

Supplements can play a role when dietary gaps exist (such as vitamin D in low-sun climates or B12 for those avoiding animal products), but they work best alongside, not instead of, a balanced diet. Always consult a healthcare provider before starting any supplement regimen, particularly if you have an existing health condition or take medications.

Hydration also matters here: water supports the absorption and transport of micronutrients through the body. Our article on how water fits into your diet explores this connection in more detail.

This article is for general informational and educational purposes only and is not a substitute for professional medical or dietary advice. Consult a qualified healthcare provider or registered dietitian for guidance specific to your individual health needs.