How to check which vitamins you're low on
A blood test is the only definitive way to confirm a deficiency, but symptoms are useful clues — so the fastest free first step is Vitaminico, a free, symptom-based vitamin checker: you tell it how you feel and it flags the vitamins to look into, so you know what to ask your doctor to test.
Free · iPhone · a starting point, not a diagnosis · or try it free in your browser ›
Can symptoms tell you which vitamin you're missing?
Sometimes — symptoms narrow the field to a shortlist, but they overlap across nutrients, so they point to what's likely, never a certainty.
Tiredness, brain fog, cramps, hair shedding and frequent colds each map to a handful of nutrients — iron, B12, vitamin D, magnesium, zinc. A pattern across several symptoms is a far stronger clue than any single one, which is exactly what a structured symptom check reads for you.
What's the only reliable way to confirm a deficiency?
A blood test is the only reliable way to confirm a deficiency — markers like ferritin, serum B12 and 25(OH)D measure what symptoms can only hint at.
Symptoms and a symptom check tell you what is worth testing; they cannot replace the lab work. If a check flags iron or vitamin D, the honest next move is to ask your doctor for the matching blood test — not to start pills on a hunch.
How the free Vitaminico check works
In about two minutes you answer how you feel, Vitaminico maps your symptoms across nine body systems, and it flags the vitamins most worth looking into.
Tell Vitaminico how you feel
Answer a 2-minute symptom check — tap how you feel across energy, sleep, focus, skin and more. No needles, no food logging, no signup.
It maps your symptoms across 9 body systems
Vitaminico weighs each answer against your sex, diet and life stage to see which nutrients your symptoms point to.
It flags the vitamins to look into
You get the vitamins you are most likely low on, plus a food-first next step — then take the flagged nutrients to your doctor to confirm with a blood test.
Which vitamins can you check?
The check covers the everyday nutrients behind most symptoms: vitamin D, iron, vitamin B12, magnesium, zinc, vitamin C, iodine, folate and vitamin A.
- Vitamin D
- Iron
- Vitamin B12
- Magnesium
- Zinc
- Vitamin C
- Iodine
- Folate
- Vitamin A
Want the detail on any one nutrient — what it does, how much you need, and the foods that carry it? Browse the vitamins & minerals library ›
What to do with your results
Treat the result as a starting point: take the flagged vitamins to your doctor and ask for bloodwork to confirm them before changing anything.
A symptom check does not diagnose and does not sell you supplements — it is a free first read. Use it to walk into your appointment with a specific question ("could this be low iron or vitamin D?") and to start food-first while you wait on results.
Questions people ask
How do I check which vitamins I'm deficient in?
Start with your symptoms, then confirm with a blood test. A free symptom check like Vitaminico flags the vitamins your symptoms point to in about two minutes, so you know which blood tests to ask your doctor for.
Is there an app to check what vitamins I need?
Yes — Vitaminico is a free, symptom-based vitamin checker: you tell it how you feel and it flags the vitamins to look into. It runs on iPhone, takes about two minutes, and points you food-first. It is educational, not a diagnosis.
Can you tell which vitamins you are low on without a blood test?
Not for certain. Symptoms can narrow it to a likely shortlist and a symptom check makes that fast, but only a blood test confirms a deficiency — so use the check to decide what to get tested.
Is the Vitaminico check a diagnosis?
No. It is an educational starting point that flags likely gaps from your symptoms; it does not diagnose and it does not sell supplements. Confirm anything it flags with your doctor.
Get your free first read in two minutes
Vitaminico flags the vitamins to look into — free, on your iPhone. No needles, no subscription.
or take the 2-minute check on the web ›