A calm, plain-English reference for the nutrients your body runs on — what each one does, which foods carry it, and when a shortfall is actually worth thinking about. No supplements to sell, no scare tactics.
Vitamins · Minerals · Where the food is
Most nutrient advice is either a wall of numbers or a sales pitch. This is neither.
Vitamin Vault is a straightforward reference to the vitamins and minerals in everyday food. Each entry answers three practical questions: what the nutrient does in your body, which ordinary foods deliver it, and what a genuine shortfall tends to look like. That's it — no proprietary blends, no miracle framing, no fear.
The aim is quiet usefulness. Skim the index when you're curious, read a full guide when you want the detail, and check the deficiency table when something feels worth a closer look. When in doubt, the answer is nearly always a doctor and a blood test, not a jar of pills.
It's the one nutrient a lot of people are genuinely short on, especially through the darker months — and the signs are quiet enough to miss. Here's what tends to show up, and the simple way to actually find out.
Read the article →Each one takes a single nutrient people ask about, and answers the same practical questions: what it does, where to find it, and when to pay attention.
Tiredness, low mood, achy bones — the signs are vague on their own. What to watch for, and why a blood test settles it.
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You can eat plenty of iron and still absorb little. A few simple pairings — and one thing to skip at mealtimes — change that.
Read →
B12 hides almost entirely in animal foods. If you eat little or none, here's how to cover it reliably rather than by luck.
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Nuts, seeds, beans, whole grains and dark leaves. A short list of the foods that carry the most, and how to work them in.
Read →
Zinc genuinely matters for your immune system — but the popular story oversells it. Here's the honest version.
Read →Folate, vitamin C, calcium and potassium are next on the shelf. The index below already covers the essentials at a glance.
Jump to the index →A quick reference card for each nutrient: its main job, and the everyday foods that carry it. Print it, screenshot it, or just skim.
The one many people run low on in winter.
Pair plant iron with vitamin C to absorb more.
Almost absent from unfortified plant foods.
Widespread in whole plant foods.
Plant sources absorb a little less readily.
Easy to get from a varied plate.
Especially important before and during pregnancy.
Works alongside vitamin D for bones.
Plentiful in fruit and vegetables.
None of these prove a shortfall on their own — most have many possible causes. Treat the table as a prompt to ask a doctor, not a diagnosis.
| Nutrient | Signs sometimes linked to a shortfall | Food to reach for first |
|---|---|---|
| Vitamin D | Persistent tiredness, low mood, achy bones or muscles | Oily fish, eggs, fortified foods, sunlight |
| Iron | Unusual fatigue, pale skin, breathlessness, brittle nails | Red meat, lentils, greens plus vitamin C |
| Vitamin B12 | Tingling hands or feet, fatigue, foggy thinking | Meat, eggs, dairy, or a reliable supplement |
| Magnesium | Muscle cramps, twitches, poor sleep, low energy | Nuts, seeds, beans, whole grains, greens |
| Zinc | Slow-healing cuts, dulled taste or smell, frequent colds | Shellfish, beef, pumpkin seeds, chickpeas |
| Vitamin C | Slow healing, easy bruising, sore or bleeding gums | Citrus, berries, peppers, broccoli |
Ongoing or worrying symptoms are a reason to see a doctor. A simple blood test is the only way to confirm a genuine deficiency.
For most people eating a reasonably varied diet, a multivitamin isn't necessary and won't do much. It's not harmful in normal doses, but it can lull you into skipping the real work — a plate with enough vegetables, whole grains, beans and a protein source. Supplements make more sense for specific gaps, like B12 on a plant-based diet or vitamin D through winter, than as a blanket insurance policy.
A blood test, ordered by a doctor. The symptoms linked to low nutrient levels — tiredness, cramps, foggy thinking — are frustratingly vague and overlap with dozens of other things, including simply not sleeping enough. If you have persistent symptoms, that's a reason to get checked rather than to start guessing with pills. Self-diagnosing from a symptom list tends to create worry, not answers.
Mostly, yes — with two well-known exceptions. Vitamin D is hard to get from food in the darker months, so many people in northern climates benefit from a supplement then. And vitamin B12 is almost absent from plant foods, so anyone eating little or no animal produce needs a fortified food or a supplement. Beyond those, a varied whole-food diet covers the rest for most people.
No, and this is where supplements can backfire. Water-soluble vitamins like C are mostly flushed out in excess, but the fat-soluble ones — A, D, E and K — and minerals like iron can build up and cause problems at high doses. The doses in whole food are safe by design. The doses in some high-strength pills are not something to take casually, especially without a reason.
Some, but far less than people fear. Heat and water reduce a few of the more fragile vitamins, like vitamin C and some B vitamins, which is why steaming or roasting keeps more than boiling in lots of water. But cooking also makes some nutrients easier to absorb. A cooked vegetable is still a good vegetable — the worst option is the one you skip because you were worried about losing a little vitamin C.
No. Vitamin Vault is general nutrition information for a curious adult audience. It doesn't diagnose, and it isn't a substitute for a doctor or dietitian. If you're pregnant, managing a health condition, taking medication, or have ongoing symptoms, talk to a professional before making big changes or starting supplements.