What are the 27 essential vitamins and minerals?
Essential vitamins and minerals are nutrients your body must obtain from food or supplements because it cannot make enough of them on its own. They are vital for growth, metabolism, and everyday functions. This guide lists all 27 essential micronutrients—13 vitamins and 14 minerals—explains what each one does, and highlights common deficiency risks. You will also learn why symptoms alone can mislead and how to use supplements wisely.
Essential nutrients vs. micronutrients
Vitamins and minerals are called micronutrients because your body needs them in small amounts compared to macronutrients like carbohydrates, proteins, and fats. Yet they are essential for life. Vitamins are organic compounds that support processes like energy production and cell repair. Minerals are inorganic elements that help with bone structure, nerve signaling, and fluid balance. Both are critical, and your body relies on them to function properly.
When people talk about “essential nutrients,” they often include all six classes: carbohydrates, proteins, fats, vitamins, minerals, and water. However, this article focuses specifically on the 27 essential vitamins and minerals that are considered micronutrients. Carbohydrates, proteins, fats, and water are not part of this count.
The 13 essential vitamins
Vitamins are grouped into two categories: fat-soluble and water-soluble. Fat-soluble vitamins (A, D, E, K) can be stored in your body’s fat tissue, while water-soluble vitamins (B-complex and C) are not stored easily and need more regular intake.
Fat-soluble vitamins
Vitamin A
What it does: Supports vision, immune function, and skin health. It helps with low-light vision and keeps your skin and mucous membranes healthy.
Food sources: Liver, eggs, dairy, carrots, sweet potatoes, leafy greens.
Deficiency risk: Low intake, fat malabsorption, or restrictive diets. Symptoms like dry eyes or night vision issues can appear but overlap with other causes.
Vitamin D
What it does: Helps regulate calcium and phosphate for bone health, muscle function, and immune signaling. Your skin makes vitamin D from sunlight.
Food sources: Oily fish (salmon, mackerel), fortified foods, egg yolks.
Deficiency risk: Limited sun exposure, higher latitude, darker skin, or consistent sunscreen use. Low levels are common, but testing helps confirm.
Vitamin E
What it does: Acts as an antioxidant, protecting cell membranes from damage.
Food sources: Nuts, seeds, vegetable oils, whole grains.
Deficiency risk: Uncommon, but can occur with fat malabsorption or very low-fat diets. High doses may interact with blood-thinning medications.
Vitamin K
What it does: Needed for blood clotting and bone health.
Food sources: Leafy greens (kale, spinach), broccoli, fermented foods, animal foods.
Deficiency risk: Rare, but fat malabsorption or prolonged antibiotic use can increase risk. People on blood thinners need consistent intake.
Water-soluble vitamins
Vitamin C
What it does: Supports collagen formation (for skin, blood vessels, gums), acts as an antioxidant, and enhances iron absorption from plant foods.
Food sources: Citrus fruits, berries, peppers, broccoli, potatoes.
Deficiency risk: Low fruit/vegetable intake, smoking, or alcohol misuse. Fatigue, easy bruising, and slow wound healing can occur.
Vitamin B1 (Thiamine)
What it does: Helps convert carbohydrates into energy and supports nerve function.
Food sources: Whole grains, legumes, pork, fortified cereals.
Deficiency risk: Chronic alcohol use, very low-calorie diets, or malabsorption. Early signs include fatigue and irritability.
Vitamin B2 (Riboflavin)
What it does: Plays a role in energy production and supports skin and eye health.
Food sources: Dairy, eggs, meat, leafy greens.
Deficiency risk: Low dairy/meat intake or poor diet quality. Symptoms like sore tongue or light sensitivity can occur.
Vitamin B3 (Niacin)
What it does: Helps with energy metabolism and supports skin and nervous system health.
Food sources: Meat, fish, whole grains, legumes.
Deficiency risk: Severe deficiency is rare; more common in very limited diets. High-dose niacin can cause flushing.
Vitamin B5 (Pantothenic acid)
What it does: Part of coenzyme A, involved in fatty acid metabolism and hormone production.
Food sources: Widely available in meat, vegetables, whole grains.
Deficiency risk: Rare, except with severe malnutrition.
Vitamin B6 (Pyridoxine)
What it does: Supports amino acid metabolism, red blood cell production, and neurotransmitter synthesis.
Food sources: Poultry, fish, potatoes, bananas, legumes.
Deficiency risk: Certain medications, alcohol misuse, or pregnancy. Excess intake can cause nerve issues.
Vitamin B7 (Biotin)
What it does: Helps in fatty acid synthesis and gluconeogenesis.
Food sources: Egg yolks, nuts, seeds, legumes.
Deficiency risk: Rare, but possible with excessive raw egg white intake or certain genetic disorders.
Vitamin B9 (Folate)
What it does: Essential for DNA synthesis and cell division, especially during pregnancy.
Food sources: Leafy greens, legumes, citrus fruits, fortified grains.
Deficiency risk: Higher needs in pregnancy, low intake, or malabsorption. Deficiency can lead to anemia.
Vitamin B12 (Cobalamin)
What it does: Supports red blood cell formation, nerve health, and DNA synthesis.
Food sources: Meat, fish, dairy, eggs; fortified foods for plant-based diets.
Deficiency risk: Vegan diets without fortification, low stomach acid, pernicious anemia, or GI surgery. Symptoms include numbness, fatigue, and cognitive changes.
The 14 essential minerals
Minerals are divided into major minerals (needed in larger amounts) and trace minerals (needed in smaller amounts).
Major minerals
Calcium
What it does: Builds bones and teeth, supports muscle contraction and nerve transmission.
Food sources: Dairy, fortified plant milks, tofu, leafy greens.
Deficiency risk: Low intake, vitamin D deficiency, or GI conditions. Excess supplements may increase kidney stone risk.
Phosphorus
What it does: Plays a role in energy production (ATP) and bone formation.
Food sources: Protein-rich foods like meat, dairy, legumes; also in processed foods as additives.
Deficiency risk: Uncommon with typical diets; kidney function affects balance.
Magnesium
What it does: Cofactor in over 300 enzyme reactions, supports muscle and nerve function, and helps with energy.
Food sources: Nuts, seeds, whole grains, legumes, leafy greens.
Deficiency risk: Often low intake, especially with diets high in processed foods. Symptoms like cramps and fatigue are nonspecific.
Sodium
What it does: Maintains fluid balance and nerve impulses.
Food sources: Table salt, processed foods.
Deficiency risk: Rare, but may occur with heavy sweating or diarrhea. Excess intake is common.
Potassium
What it does: Supports heart rhythm, muscle contraction, and fluid balance.
Food sources: Fruits, vegetables, legumes, dairy.
Deficiency risk: Low fruit/vegetable intake, diuretic use, or GI losses. Symptoms include weakness and cramps.
Chloride
What it does: Works with sodium to maintain fluid balance and is part of stomach acid.
Food sources: Table salt, seaweed, rye.
Deficiency risk: Rare, but can occur with vomiting or diarrhea.
Sulfur
What it does: Part of amino acids and antioxidants; supports connective tissue. Sulfur is technically essential, but your body gets it from protein foods, so it's not always counted as a separate nutrient.
Food sources: Meats, eggs, legumes, nuts.
Deficiency risk: Not typically a concern with adequate protein intake.
Trace minerals
Iron
What it does: Carries oxygen in red blood cells and supports energy metabolism.
Food sources: Red meat, poultry, fish, legumes, fortified cereals (non-heme iron from plants).
Deficiency risk: Menstrual blood loss, low intake, pregnancy, or absorption issues. Fatigue and pallor are common signs.
Zinc
What it does: Supports immune function, wound healing, and DNA synthesis.
Food sources: Meat, shellfish, dairy, nuts, seeds.
Deficiency risk: Low animal-food intake, high-phytate diets, or malabsorption. Excess zinc can lower copper levels.
Iodine
What it does: Required for thyroid hormone production, which regulates metabolism.
Food sources: Iodized salt, sea fish, dairy, seaweed.
Deficiency risk: Non-iodized salt use, low seafood/dairy intake. Both low and high iodine can affect thyroid.
Selenium
What it does: Works as an antioxidant and supports thyroid function.
Food sources: Brazil nuts, seafood, meats, eggs.
Deficiency risk: Low-selenium soil, restrictive diets. High doses can be toxic.
Copper
What it does: Helps with iron transport and connective tissue formation.
Food sources: Shellfish, organ meats, nuts, seeds, cocoa.
Deficiency risk: Uncommon, but excess zinc or GI surgery can increase risk.
Manganese
What it does: Acts as a cofactor for enzymes involved in metabolism and antioxidant defense.
Food sources: Whole grains, tea, nuts, leafy greens.
Deficiency risk: Rare with varied diets.
Chromium
What it does: Historically linked to insulin function; evidence is debated.
Food sources: Whole grains, meats, some fruits and vegetables.
Deficiency risk: Rare; not widely established.
Molybdenum
What it does: Supports enzymes involved in processing sulfur amino acids and purines.
Food sources: Legumes, grains, nuts.
Deficiency risk: Very rare.
Why micronutrient balance matters
Micronutrients are involved in almost every bodily function: energy production, immune defense, bone health, brain function, and more. Deficiencies can show up as vague symptoms—tiredness, frequent infections, brittle nails—but these clues are not specific. Many different nutrient gaps, or even non-nutritional issues, can cause similar signs. For example, fatigue might come from low iron, low B12, poor sleep, or an underactive thyroid. That’s why it’s important to look at your overall diet and patterns, and when needed, get blood tests to confirm which nutrients might be low.
Food sources and daily intake
Eating a wide variety of whole foods is the best way to meet your daily vitamin and mineral needs. Here are some general food groups and the nutrients they provide:
- Fruits and vegetables: vitamin C, folate, potassium, vitamin A
- Whole grains and legumes: B vitamins, magnesium, zinc
- Dairy or fortified alternatives: calcium, vitamin D, B12
- Nuts and seeds: vitamin E, magnesium, zinc
- Seafood: iodine, selenium, B12
- Meat and poultry: iron, B12, zinc
Some nutrients are more commonly lacking than others. Vitamin D, iron (especially in women), magnesium, iodine, and B12 are often short. In such cases, a supplement can help fill the gap. But before you start any supplement, it’s wise to review your diet, consider testing, and choose doses that support sufficiency without going overboard.
Understanding deficiencies and their symptoms
Deficiency symptoms are often subtle and can overlap with many other conditions. Here are some common signs people notice and what they might relate to:
- Fatigue: iron, B12, folate, or magnesium
- Frequent infections: vitamin D, zinc, vitamin C
- Muscle cramps: magnesium, potassium, calcium
- Hair or nail changes: iron, zinc, biotin
- Mouth ulcers: B12, folate, iron
- Poor wound healing: vitamin C, zinc
These symptoms are clues, not proof. Instead of guessing, use a structured approach: evaluate your diet, note which symptoms persist, and consider lab tests to check your levels. Your doctor can help interpret results and guide you on safe supplementation.
How to use supplements safely
Supplements are not replacements for a healthy diet, but they can be helpful when your diet falls short. Here’s a step-by-step approach:
- Assess your diet: Keep a food diary for a week to see which food groups you might be missing.
- Identify patterns: Match your symptoms to potential nutrient gaps, but keep in mind that many causes are possible.
- Consider testing: Blood tests for vitamin D, iron, B12, and magnesium can provide clarity.
- Choose targeted supplements: Pick the nutrient you need at an appropriate dose, and avoid overlapping multi-product formulas.
- Monitor and reassess: Recheck levels after a few months to see if you need to continue.
Be aware that fat-soluble vitamins (A, D, E, K) can build up in your body, and minerals can compete with each other—for example, high zinc can lower copper. Always follow the dosage on the label unless your doctor advises otherwise. If you have a medical condition or take medications, talk to a healthcare professional before starting any supplement.
When to see a doctor
If you have severe, sudden, or persistent symptoms, don’t rely on self-diagnosis. Seek medical care, especially if you experience chest pain, shortness of breath, unusual bleeding, or neurological problems. A doctor can help identify the root cause, which might not be a nutrient deficiency at all.
Conclusion
A solid understanding of the 27 essential vitamins and minerals helps you make informed decisions about your diet and supplement use. Focus on eating a variety of nutrient-dense foods, be aware of common shortfalls, and use supplements as a tool to fill verified gaps—not as a shortcut. With a thoughtful approach, you can support your body's needs safely.
FAQ
Do I really need all 27 essential vitamins and minerals every day?
You need regular intake of all essential micronutrients, but you don't need to hit the exact amount daily. Your body can store some vitamins, and your intake can vary over a few days. Aim for consistency across the week.
Can I get enough through food alone?
Many people can, especially if they eat a varied diet. However, nutrients like vitamin D, iodine, and B12 can be harder to get from food alone, depending on your location and diet type. Supplements can help close those gaps.
Which deficiencies are most common?
Vitamin D, iron, magnesium, iodine, and B12 are often low, but it depends on your region, diet, and lifestyle. Testing can tell you for sure.
Are multivitamins enough?
Multivitamins can provide a baseline, but they may not address specific gaps that you have. A targeted supplement plan based on your diet and test results can be more effective.
Can symptoms alone tell me what I'm missing?
No. Symptoms like fatigue or brittle nails can come from many causes, not just one nutrient deficiency. Use them as a starting point for investigation, not as a diagnosis.
Is more always better with vitamins and minerals?
No. More is not better, and some nutrients can be harmful in excess. Fat-soluble vitamins can accumulate, and excess minerals can cause imbalances. Stick to recommended amounts.
What affects nutrient absorption?
Gut health, stomach acid levels, medications, and age can all affect how well you absorb nutrients. For example, PPIs reduce stomach acid, which can affect B12 and iron absorption. Stress and some health conditions can also interfere.
Key takeaways
- Essential vitamins and minerals are required for normal body function.
- The 27 essential micronutrients include 13 vitamins and 14 minerals.
- Food-first is best, but supplements can fill verified gaps.
- Symptoms are not specific; use diet review and testing to identify real deficiencies.
- Fat-soluble vitamins can accumulate; minerals can compete—dose carefully.
- Common shortfalls include vitamin D, iron, magnesium, iodine, and B12.
- Consult a healthcare provider if you have persistent or severe symptoms.
