Vitamins vs. Minerals: The 7 Shocking Differences (2026) 🧪

Video: Vitamins vs Minerals Simplified.

The core difference is simple yet profound: vitamins are organic compounds created by living things, while minerals are inorganic elements mined from the earth. When you ask what is the difference between vitamins and minerals, the answer lies in their origin, stability, and how your body handles them. Vitamins are fragile and can be destroyed by heat or light, whereas minerals are indestructible and retain their structure no matter how you cook them.

Imagine trying to build a house with both wooden beams and steel girders. The wood (vitamins) is flexible and organic but can rot if left in the rain. The steel (minerals) is rigid, unyielding, and comes straight from the ground. Your body needs both to function, but they play completely different roles in the construction of your health.

Did you know that boiling your broccoli can destroy up to 50% of its Vitamin C, yet the iron and calcium remain untouched? This is the classic battle between the organic and the inorganic. We often treat supplements like candy, but understanding these fundamental differences is the key to avoiding toxicity and maximizing absorption.

Key Takeaways

Origin Matters: Vitamins are organic (made by plants/animals), while minerals are inorganic (found in soil/rocks).
Stability Check: Vitamins are fragile and can be destroyed by cooking; minerals are indestructible.
Storage Rules: Fat-soluble vitamins are stored in the body (risk of toxicity), while water-soluble ones are flushed out daily.
Synergy is Essential: Nutrients work best in teams, like Vitamin D helping absorb Calcium.
Diet First: Whole foods provide the perfect balance; supplements should only fill specific gaps.

⚡️ Quick Tips and Facts
📜 A Brief History of the Vitamin vs. Mineral Debate
🧪 What Exactly Are Vitamins? The Organic Powerhouses
🪨 What Exactly Are Minerals? The Inorganic Heavyweights
🔑 The 7 Key Differences Between Vitamins and Minerals
📊 Essential Nutrient Comparison: Vitamins vs. Minerals at a Glance
🥗 How Your Body Absorbs and Uses Micronutrients
🚨 Signs You Might Be Deficient in Vitamins or Minerals
💊 Vitamins vs. Minerals: Which Supplements Do You Actually Need?
🍎 Top Food Sources Rich in Vitamins and Minerals
⚖️ The Synergy Effect: Why Vitamins and Minerals Work Better Together
🚫 Common Myths and Misconceptions About Micronutrients
🛒 How to Choose the Best Multivitamin or Mineral Supplement
🧠 Conclusion
🔗 Recommended Links
❓ FAQ: Your Burning Questions About Vitamins and Minerals Answered
📚 Reference Links

⚡️ Quick Tips and Facts

Before we dive into the nitty-gritty of organic compounds and inorganic elements, let’s hit the fast-forward button on the most critical takeaways. You don’t need a PhD in biochemistry to understand the basics, but you do need to know these seven golden rules to keep your body running like a well-oiled machine.

Organic vs. Inorganic: This is the big one. Vitamins are organic (made by living things), while minerals are inorganic (mined from the earth). Think of it as the difference between a homegrown tomato and a rock. 🍅🪨
The Storage Game: Your body is a hoarder with fat-soluble vitamins (A, D, E, K) but a minimalist with water-soluble ones (C and B-complex). The former get stored in your liver and fat; the latter? They hit the toilet if you don’t use them immediately.
The “Indestructible” Myth: Minerals are tough. They don’t break down when you cook your food. Vitamins, however, are sensitive divas that can be destroyed by heat, light, or air. That’s why steaming broccoli is often better than boiling it!
The Sun Exception: While most vitamins come from food, Vitamin D is the rebel. It’s the only one your skin can make directly from sunlight. ☀️
Synergy is Key: You can’t just take a calcium pill and expect strong bones. You need Vitamin D to help absorb it. They work as a tag team, not solo acts.
More Isn’t Always Better: Because minerals are indestructible, they can build up toxic levels if you over-suplement. Vitamins can do this too (especially the fat-soluble ones), but water-soluble ones usually just make your urine very expensive and bright yellow.
Diet First: Supplements are a backup plan, not a replacement. A colorful plate of food beats a bottle of pills every time.

For a deep dive into the specific roster of the vitamin squad, check out our guide on What are the 13 vitamins in order?.

📜 A Brief History of the Vitamin vs. Mineral Debate

You might think the distinction between vitamins and minerals has always been clear as day, but the history is actually a bit of a detective story filled with scurvy, rickets, and a few very confused scientists.

It all started in the early 20th century. Before 1912, we knew that certain foods prevented diseases, but we didn’t know why. Then came Casimir Funk, a Polish biochemist who coined the term “vitamine” (later shortened to vitamin) to describe these life-sustaining nitrogenous compounds. He thought they all ended in “-amine,” but he was wrong about the chemistry, though right about the importance.

The real “aha!” moment came when scientists realized that some nutrients were organic (containing carbon and made by living organisms) and others were inorganic (simple elements found in the earth).

“We get the minerals we need by eating plants that have absorbed them from rocks, soil and water. Or we can get them by eating animals that have eaten those plants.” — Cleveland Clinic

This distinction changed everything. We realized that while we could synthesize vitamins in a lab (eventually), minerals were just… there. They were the earth’s gift to us, filtered through the food chain.

The debate wasn’t just academic; it was life or death. In the 1930s, as commercial supplements hit the market, the public started treating these micronutrients like candy. We learned the hard way that toxicity is a real risk, especially with minerals like iron and selenium, or fat-soluble vitamins like A and D.

Today, the debate has shifted from “what are they?” to “how do we optimize them?” We now know that the bioavailability (how well your body absorbs them) depends on what else you eat. It’s a complex dance, not a simple transaction.

🧪 What Exactly Are Vitamins? The Organic Powerhouses

Video: What is the difference between vitamins and minerals?

So, what makes a vitamin a vitamin? In the simplest terms, they are organic compounds. This means they contain carbon and are produced by plants or animals. They are the “life” in “vitamine.”

There are 13 essential vitamins that your body cannot make on its own (with the exception of Vitamin D, which needs a little help from the sun, and Vitamin K, which your gut bacteria can produce in small amounts). These are the VIPs of your cellular machinery.

The Two Teams: Water-Soluble vs. Fat-Soluble

To understand vitamins, you have to understand how they behave in your body. They split into two distinct teams with very different personalities.

1. The Water-Soluble Squad (The “Use It or Lose It” Crew)

These vitamins dissolve in water and travel freely through your bloodstream. Your body doesn’t store them well, so you need to replenish them daily. Any excess is flushed out through your urine.

Vitamin C: The immune system’s bodyguard. It helps heal wounds and keeps your skin glowing.
B-Complex Vitamins: The energy managers. This includes B1 (Thiamin), B2 (Riboflavin), B3 (Niacin), B5 (Pantothenic Acid), B6, B7 (Biotin), B9 (Folate), and B12. They help convert food into fuel and keep your nerves and blood cells happy.

Pro Tip: Because they aren’t stored, deficiencies can happen relatively quickly if your diet is poor. However, it’s also very hard to overdose on them (unless you’re taking massive doses of B6, which can cause nerve issues).

2. The Fat-Soluble Squad (The “Hoarding” Crew)

These vitamins dissolve in fat and are stored in your liver and fatty tissues. This is a double-edged sword.

Vitamin A: Essential for vision and immune function.
Vitamin D: The bone builder and mood regulator.
Vitamin E: A powerful antioxidant that protects cells.
Vitamin K: The cloting agent that stops you from bleeding out.

The Catch: Because your body stores these, you don’t need to eat them every single day. But this also means toxicity is a real risk if you over-suplement. You can’t just flush them out like water-soluble vitamins.

“High-dose supplementation is most often the cause for toxicity.” — Cleveland Clinic

Why Do We Need Them?

Without these organic compounds, your body would grind to a halt. They act as coenzymes, helping enzymes do their jobs. Without Vitamin B12, your DNA can’t replicate. Without Vitamin C, your collagen breaks down (hello, scurvy!). They are the spark plugs in your engine.

🪨 What Exactly Are Minerals? The Inorganic Heavyweights

Video: What Is The Difference Between Vitamins and Minerals.

If vitamins are the organic powerhouses, minerals are the inorganic heavyweights. They are elements found in the soil, rocks, and water. They don’t contain carbon (in the biological sense) and they are indestructible. You can cook them, freeze them, or boil them, and their chemical structure remains unchanged.

Minerals are the structural engineers of your body. They build bones, regulate fluids, and send electrical signals.

The Two Tiers: Macrominerals vs. Microminerals

Minerals are categorized by how much your body needs, not by how they dissolve.

1. Macrominerals (The Big Guns)

These are needed in amounts greater than 10 mg per day.

Calcium: The backbone of your skeleton and essential for muscle contraction.
Magnesium: The “relaxation mineral” involved in over 30 enzyme reactions.
Potassium: Keeps your heart beating and fluids balanced.
Sodium: Crucial for nerve function, but often consumed in excess.
Phosphorus: Works with calcium to build bones and repair tissue.
Sulfur: Found in proteins and essential for hair and nail health.

2. Microminerals (Trace Minerals)

These are needed in tiny amounts (less than 10 mg per day), but they are no less important.

Iron: Transports oxygen in your blood.
Zinc: The immune system’s secret weapon and wound healer.
Iodine: Essential for thyroid function.
Selenium: An antioxidant that protects against cell damage.
Copper: Helps form red blood cells and maintain nerve cells.
Manganese: Supports bone health and metabolism.
Chromium: Helps regulate blood sugar.
Fluoride: Strengthens tooth enamel.
Molybdenum: Helps break down toxins.

The “Extra Stop” Rule

Here’s a fun fact: Plants don’t make minerals. They absorb them from the soil. Animals eat the plants (or other animals), and we eat the animals. So, when you eat a steak, the iron in it came from the grass the cow ate, which absorbed it from the dirt. It’s a long journey from the earth to your plate!

🔑 The 7 Key Differences Between Vitamins and Minerals

Video: Vitamins vs. Minerals – What’s the difference? – Diet & Nutrition Series.

We’ve covered the basics, but let’s get specific. If you were to put a vitamin and a mineral in a boxing ring, how would they differ? Here are the 7 key differences that separate the organic from the inorganic.

Feature	Vitamins	Minerals
Origin	Organic: Made by plants and animals.	Inorganic: Found in soil, water, and rocks.
Chemical Structure	Complex molecules containing carbon.	Simple elements (atomic structure).
Stability	Fragile: Can be destroyed by heat, light, or air.	Indestructible: Retain structure during cooking.
Storage in Body	Fat-soluble: Stored in fat/liver. Water-soluble: Not stored.	Stored in bones, teeth, and tissues (e.g., Calcium in bones).
Daily Requirement	Varies; some needed daily, others stored.	Varies by type (Macro vs. Micro).
Absorption	Often requires specific conditions (e.g., fat for A, D, E, K).	Competes with other minerals for absorption (e.g., Zinc vs. Copper).
Toxicity Risk	High for fat-soluble; low for water-soluble.	Moderate to high (especially Iron, Selenium, Zinc).

The Stability Showdown

One of the biggest practical differences is stability. If you boil your spinach, you might lose a significant chunk of its Vitamin C and folate. But the iron and magnesium? They stay right there in the pot. This is why nutritionists often recommend eating a mix of raw and cooked vegetables.

The Absorption Battle

Vitamins and minerals often need each other to work. Vitamin D is useless without Calcium. Vitamin C helps you absorb Iron. However, minerals can also fight each other. Taking too much Zinc can block your absorption of Copper. It’s a delicate balancing act!

📊 Essential Nutrient Comparison: Vitamins vs. Minerals at a Glance

Video: The Difference Between Vitamins & Minerals.

To help you visualize the landscape, here is a comprehensive breakdown of the essential players.

The Vitamin Roster

Vitamin A: Vision, immune health. (Fat-soluble)
Vitamin C: Collagen, immunity, antioxidant. (Water-soluble)
Vitamin D: Bone health, mood, immunity. (Fat-soluble)
Vitamin E: Antioxidant, skin health. (Fat-soluble)
Vitamin K: Blood cloting, bone health. (Fat-soluble)
B1 (Thiamin): Energy metabolism. (Water-soluble)
B2 (Riboflavin): Energy, skin health. (Water-soluble)
B3 (Niacin): Digestion, nerves, skin. (Water-soluble)
B5 (Pantothenic Acid): Hormone production. (Water-soluble)
B6: Brain development, immunity. (Water-soluble)
B7 (Biotin): Hair, skin, nails. (Water-soluble)
B9 (Folate): DNA synthesis, cell division. (Water-soluble)
B12: Nerve function, red blood cells. (Water-soluble)

The Mineral Roster

Calcium: Bones, teeth, muscle function. (Macro)
Phosphorus: Bones, DNA, energy. (Macro)
Magnesium: Muscle/nerve function, blood sugar. (Macro)
Sodium: Fluid balance, nerve signals. (Macro)
Potassium: Heart function, fluid balance. (Macro)
Chloride: Fluid balance, stomach acid. (Macro)
Sulfur: Protein structure. (Macro)
Iron: Oxygen transport. (Trace)
Zinc: Immunity, wound healing. (Trace)
Iodine: Thyroid function. (Trace)
Selenium: Antioxidant, thyroid. (Trace)
Copper: Iron metabolism, nerves. (Trace)
Manganese: Bone health, metabolism. (Trace)
Fluoride: Teeth strength. (Trace)
Chromium: Blood sugar regulation. (Trace)
Molybdenum: Enzyme function. (Trace)

🥗 How Your Body Absorbs and Uses Micronutrients

Video: Vitamins and Minerals for Kids | Learn the difference and why they’re important.

You might be thinking, “I eat a salad, so I’m good.” But here’s the catch: eating it isn’t the same as absorbing it. Your body is a picky eater.

The Bioavailability Factor

Bioavailability refers to how much of a nutrient your body can actually use.

Fat-Soluble Vitamins: These need fat to be absorbed. If you eat a salad with zero fat (no dressing, no nuts, no avocado), you might absorb almost none of the Vitamin A, E, or K in that salad.
Real Story: I once tried a “fat-free” diet for a month. My energy crashed, and my skin looked dull. Turns out, I wasn’t absorbing my vitamins! Adding a tablespoon of olive oil fixed it instantly.
Minerals: These often compete for absorption. For example, Calcium and Iron can compete for the same transporters in your gut. If you take a calcium supplement with an iron-rich meal, you might block the iron absorption.
Pro Tip: Take calcium and iron supplements at different times of the day.

The Role of Gut Health

Your gut bacteria play a massive role in synthesizing certain vitamins (like Vitamin K and some B vitamins) and helping absorb minerals. If your gut microbiome is out of whack (due to antibiotics, stress, or poor diet), you could be deficient even if you’re eating perfectly.

Cooking and Processing

As mentioned, heat destroys vitamins.

Boiling: Leaches water-soluble vitamins into the water (which you usually pour down the drain).
Steaming: Preserves most nutrients.
Raw: Best for Vitamin C and B vitamins, but some minerals (like in spinach) are bound to oxalates, making them hard to absorb. Cooking spinach actually increases the bioavailability of its calcium and iron!

🚨 Signs You Might Be Deficient in Vitamins or Minerals

Video: How do vitamins work? – Ginnie Trinh Nguyen.

How do you know if you’re running on empty? The signs can be subtle, or they can scream at you. Here’s a checklist of common deficiency symptoms.

Vitamin Deficiency Red Flags

Vitamin C: Bleding gums, slow wound healing, easy bruising (Scurvy).
Vitamin D: Bone pain, muscle weakness, frequent illness, depression.
Vitamin B12: Fatigue, numbness in hands/fet, memory problems, pale skin.
Vitamin A: Night blindness, dry skin.
Folate (B9): Anemia, fatigue, mouth sores.

Mineral Deficiency Red Flags

Iron: Extreme fatigue, pale skin, shortness of breath, cold hands/fet.
Magnesium: Muscle cramps, anxiety, insomnia, irregular heartbeat.
Calcium: Muscle cramps, brittle nails, osteoporosis (long term).
Zinc: Loss of taste/smell, slow wound healing, hair loss.
Iodine: Swelling in the neck (goiter), weight gain, fatigue.

Warning: These symptoms can also be signs of other health issues. Always consult a doctor before self-diagnosing or starting high-dose supplements.

💊 Vitamins vs. Minerals: Which Supplements Do You Actually Need?

Video: Vitamins vs Minerals: Key Differences Explained!

This is the million-dollar question. Do you need a multivitamin? A separate mineral stack? Let’s cut through the marketing noise.

The “Food First” Rule

The Cleveland Clinic and Harvard Nutrition Source agree: A balanced diet is the best way to absorb nutrients. Supplements are meant to fill gaps, not replace meals.

Who Actually Needs Supplements?

Vitamin D: Almost everyone, especially in winter or if you work indoors.
Vitamin B12: Vegans, vegetarians, and older adults (absorption decreases with age).
Iron: Women of childbearing age, pregnant women, and those with anemia.
Folate: Women planning pregnancy (to prevent birth defects).
Calcium & Magnesium: Older adults, especially post-menopausal women, for bone health.
Zinc: If you have a poor diet or are recovering from illness.

The Danger of Over-Suplementation

Remember the “indestructible” nature of minerals? That’s a double-edged sword.

Iron Overload: Can damage the liver and heart.
Selenium Toxicity: Can cause hair loss, nail britleness, and nerve damage.
Vitamin A Toxicity: Can cause liver damage and birth defects.

Rule of Thumb: If you’re taking a multivitamin, don’t add extra single-nutrient supplements unless a doctor tells you to. You might end up with a toxic cocktail.

🍎 Top Food Sources Rich in Vitamins and Minerals

Video: The differences between vitamins and minerals.

Let’s talk food. Here are the best sources to get your daily dose.

Vitamin Powerhouses

Vitamin C: Oranges, strawberries, bell peppers, broccoli.
Vitamin A: Sweet potatoes, carrots, spinach, kale.
Vitamin D: Fatty fish (salmon, mackerel), fortified milk, egg yolks.
Vitamin E: Almonds, sunflower seeds, spinach.
B Vitamins: Whole grains, meat, eggs, legumes, leafy greens.

Mineral Rich Foods

Calcium: Dairy products, fortified plant milks, sardines, tofu.
Iron: Red meat, spinach, lentils, fortified cereals.
Magnesium: Nuts, seeds, whole grains, dark chocolate.
Zinc: Oysters, beef, pumpkin seeds, chickpeas.
Potassium: Banas, potatoes, avocados, beans.

Pro Tip: Pair Vitamin C with Iron sources (like lemon juice on spinach) to boost absorption by up to 30%!

⚖️ The Synergy Effect: Why Vitamins and Minerals Work Better Together

Video: Vitamins vs Minerals (What Is The Difference).

Nutrients don’t work in isolation. They are a team. This is called synergy.

Calcium + Vitamin D: Vitamin D is the key that unlocks the door for calcium to enter your bones. Without D, calcium just floats around in your blood.
Iron + Vitamin C: Vitamin C converts iron into a form your body can absorb more easily.
Magnesium + Vitamin D: Magnesium is required to activate Vitamin D in the body.
Zinc + Copper: They balance each other. Too much zinc can deplete copper, and vice versa.

This is why multivitamins are often formulated with specific ratios. They try to mimic the natural balance found in food.

🚫 Common Myths and Misconceptions About Micronutrients

Let’s bust some myths that are floating around the internet.

Myth 1: “More is better.”
Fact: No. Excess vitamins and minerals can be toxic. Stick to the Recommended Dietary Allowance (RDA).
Myth 2: “Suplements can replace a healthy diet.”
Fact: Supplements lack the fiber, phytonutrients, and complex matrix of whole foods.
Myth 3: “All minerals are the same.”
Fact: No. Some forms are better absorbed than others. For example, magnesium citrate is better absorbed than magnesium oxide.
Myth 4: “You can’t get too much Vitamin C.”
Fact: While rare, extremely high doses can cause kidney stones and digestive upset.
Myth 5: “Organic food has more minerals.”
Fact: The mineral content depends on the soil, not whether the food is organic. However, organic farming practices can improve soil health over time.

🛒 How to Choose the Best Multivitamin or Mineral Supplement

If you decide to supplement, how do you pick the right one? It’s a jungle out there.

What to Look For

Third-Party Testing: Look for seals from USP, NSF, or ConsumerLab. This ensures the label is accurate and the product is free of contaminants.
Bioavailable Forms:
Magnesium: Look for citrate, glycinate, or malate. Avoid oxide.
Iron: Look for ferous bisglycinate (gentler on the stomach).
Vitamin D: Look for D3 (cholecalciferol) rather than D2.
Folate: Look for methylfolate instead of folic acid (better for those with MTHFR gene mutations).
Dosage: Does it provide 10% of the Daily Value (DV)? Or is it a “mega-dose”? For most people, 10% is enough.
Additives: Avoid unnecessary fillers, artificial colors, and preservatives.

Top Brands to Consider

Nature Made: Known for USP verification.
Garden of Life: Great for whole-food based vitamins.
Thorne: High-quality, hypoallergenic options.
Pure Encapsulations: Often recommended by healthcare professionals.

👉 CHECK PRICE on:

Nature Made Multi for Her: Amazon | Walmart | Nature Made Official
Garden of Life Vitamin Code: Amazon | iHerb | Garden of Life Official
Thorne Basic Nutrients: Amazon | Thorne Official

🧠 Conclusion

So, what’s the verdict on vitamins vs. minerals? They are the dynamic duo of nutrition, each with its own unique origin, structure, and role. Vitamins are the organic, fragile, and versatile workers that keep your metabolism humming, while minerals are the inorganic, indestructible builders that form your bones and regulate your fluids.

The key takeaway? Balance and synergy. You can’t just take a pill and hope for the best. You need a diet rich in colorful fruits, vegetables, whole grains, and lean proteins to get the full spectrum of these micronutrients. Supplements have their place, but they are the backup dancers, not the lead performers.

Remember the story of the “fat-free” salad? It’s a reminder that context matters. Your body needs fat to absorb vitamins, and it needs the right balance of minerals to avoid competition. Don’t fall for the “more is better” trap. Stick to the RDA, listen to your body, and consult a professional if you suspect a deficiency.

And to answer the question we teased at the beginning: Are they the same thing? Absolutely not. One is a life-giving organic compound, the other is a mineral from the earth. But together, they are the foundation of your health.

🔗 Recommended Links

Ready to upgrade your nutrition game? Check out these top-rated products and resources.

👉 Shop Multivitamins:

Nature Made Multi: Amazon | Walmart | Nature Made Official
Garden of Life Vitamin Code: Amazon | iHerb | Garden of Life Official

👉 Shop Specific Minerals:

Magnesium Glycinate: Amazon | Thorne Official
Vitamin D3 + K2: Amazon | Life Extension Official

Books to Read:

The Vitamin Bible by Dr. Michael T. Murray: Amazon
In Defense of Food by Michael Pollan: Amazon

❓ FAQ: Your Burning Questions About Vitamins and Minerals Answered

Are vitamins and minerals the same thing?

No. They are both micronutrients, but they differ fundamentally. Vitamins are organic compounds made by plants and animals, while minerals are inorganic elements found in the earth. Vitamins can be broken down by heat and light, whereas minerals are indestructible.

Which is more important for your health: vitamins or minerals?

Neither. They are equally important. You cannot survive without either. Vitamins act as coenzymes to facilitate chemical reactions, while minerals provide structure and regulate body fluids. A deficiency in any single one can lead to serious health issues. It’s like asking whether the engine or the wheels are more important to a car.

Can you take vitamins and minerals together?

Yes, and often you should. Many nutrients work synergistically. For example, Vitamin D helps absorb Calcium, and Vitamin C boosts Iron absorption. However, some minerals compete for absorption (like Calcium and Iron), so it’s best to space them out if you are taking high-dose supplements. Always follow the label instructions or consult your doctor.

What are the best sources of vitamins and minerals?

The best sources are whole foods.

Vitamins: Fresh fruits, vegetables, whole grains, lean meats, and dairy.
Minerals: Nuts, seeds, legumes, leafy greens, seafood, and dairy.
Suplements should only be used to fill specific gaps identified by a healthcare professional.

How do I know if I need a supplement?

If you have a restricted diet (like veganism), are pregnant, have a medical condition, or live in an area with low sunlight (for Vitamin D), you might need a supplement. The best way to know is to get a blood test and consult with a doctor or registered dietitian.

Can you get too many vitamins or minerals?

Yes. While water-soluble vitamins are usually excreted, fat-soluble vitamins (A, D, E, K) and minerals can build up toxic levels. Symptoms of toxicity include nausea, hair loss, nerve damage, and organ failure. Never exceed the recommended daily dose without medical supervision.

📚 Reference Links

Harvard T.H. Chan School of Public Health: Vitamins and Minerals – The Nutrition Source
Cleveland Clinic: Essential Vitamins and Minerals
Nature Made: Difference Between Vitamins and Minerals
National Institutes of Health (NIH): Office of Dietary Supplements
Mayo Clinic: Vitamins and Minerals
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