Micronutrient Quick Reference: Key Vitamins and Minerals at a Glance

Why Micronutrients Matter

If macronutrients are the fuel your body burns, micronutrients are the spark plugs — small in quantity but essential for nearly every process that keeps you functioning. Vitamins and minerals support everything from immune defense and bone strength to energy metabolism and mood regulation. Unlike macronutrients like proteins, fats, and carbs, your body needs micronutrients in much smaller amounts, but the consequences of running low on them can be surprisingly significant.

This quick-reference guide lays out the key vitamins and minerals, what role each plays, and which everyday foods tend to supply them — without turning into a prescription or a shopping list.

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

Key Vitamins: Roles and Food Sources

Vitamins fall into two broad camps: fat-soluble (A, D, E, K) and water-soluble (C and the B vitamins). Fat-soluble vitamins are stored in body tissues, which means both deficiency and excess can build up over time. Water-soluble vitamins are flushed out more readily and need more regular replenishment from food.

Fat-Soluble Vitamins

• Vitamin A — Supports vision, immune function, and skin cell turnover. Found in liver, dairy, eggs, and orange-pigmented produce like sweet potatoes and carrots (which provide beta-carotene, a precursor).
• Vitamin D — Helps the body absorb calcium and supports bone and immune health. Produced by the skin in sunlight; dietary sources include fatty fish, egg yolks, and fortified foods.
• Vitamin E — Acts as an antioxidant, protecting cells from oxidative damage. Nuts, seeds, and vegetable oils are rich sources.
• Vitamin K — Crucial for blood clotting and bone metabolism. Leafy greens like kale, spinach, and broccoli are top sources.

Water-Soluble Vitamins

• Vitamin C — Supports immune function, collagen synthesis, and iron absorption. Citrus fruits, bell peppers, strawberries, and kiwi are particularly rich sources.
• B Vitamins (B1, B2, B3, B5, B6, B7, B9, B12) — This group collectively supports energy metabolism, nervous system function, and red blood cell production. Whole grains, legumes, meat, eggs, dairy, leafy greens, and nutritional yeast are common sources. Vitamin B12 is found almost exclusively in animal products, making it a nutrient worth noting for those following a plant-based diet.

Key Minerals: What They Do and Where to Find Them

Minerals are inorganic elements your body can't make on its own — they have to come from food. Some, called macrominerals, are needed in relatively larger amounts; others, called trace minerals, are needed in tiny quantities but are no less important.

Macrominerals

• Calcium — The most abundant mineral in the body, primarily stored in bones and teeth. Also involved in muscle contraction and nerve signaling. Dairy products, fortified plant milks, tofu made with calcium sulfate, and leafy greens supply it.
• Magnesium — Involved in hundreds of enzymatic reactions, including energy production and protein synthesis. Nuts, seeds, legumes, whole grains, and dark chocolate are good sources.
• Potassium — Helps regulate fluid balance, muscle contractions, and nerve signals. Bananas, potatoes, beans, and leafy greens are widely available sources.
• Sodium — Essential for fluid balance and nerve function, though most people in Western diets consume more than they need from processed foods.

Key Trace Minerals

• Iron — Carries oxygen in red blood cells. Comes in two forms: heme iron (from meat and fish, more readily absorbed) and non-heme iron (from legumes, tofu, and fortified cereals). Pairing non-heme iron with vitamin C-rich foods can improve absorption.
• Zinc — Supports immune function, wound healing, and DNA synthesis. Meat, shellfish, legumes, seeds, and dairy are reliable sources.
• Iodine — Essential for thyroid hormone production. Seafood, dairy, and iodized salt are the primary sources in most diets.
• Selenium — Functions as an antioxidant and supports thyroid health. Brazil nuts are an unusually concentrated source; seafood and poultry also provide it.

For a deeper look at how vitamins and minerals fit into the broader picture of eating well, the Everyday Nutrition hub has practical, jargon-free guidance to explore.