Vitamin C Deficiency Test: Check Your Symptoms Online
Based on NIH Office of Dietary Supplements guidance · Last reviewed: July 15, 2026 · How we source our content
Vitamin C deficiency has an image problem: most people associate it with scurvy and 18th-century sailors, so they never connect their own bruising, bleeding gums, or slow-healing cuts to their actual vegetable intake. The body can't make or store vitamin C — you're running on whatever you ate in roughly the last few weeks, and that reserve empties faster than most other nutrients.
Bruising, bleeding gums, slow healing?
Our free assessment weighs your symptoms and diet in about 2 minutes.
Why it shows up in connective tissue first
Vitamin C's main job is building collagen — the structural protein that holds blood vessel walls, skin, gums, and healing wounds together. That's why deficiency symptoms cluster around exactly those tissues rather than causing the generic fatigue you'd expect from most nutrient shortfalls:
- Bruising more easily than usual — weakened capillary walls leak under minor pressure
- Bleeding or swollen gums — often the earliest noticeable sign
- Cuts and wounds that heal slowly — collagen synthesis stalls without it
- Dry, rough, or "corkscrew" body hair — a classic but under-recognized sign
- Joint pain or swelling — from small bleeds around joints in more advanced cases
Fatigue and irritability do appear too, but usually alongside the connective-tissue signs above — fatigue alone is rarely the first clue.
Who actually runs low
Because vitamin C is abundant in common produce, most omnivorous diets cover it without effort. Risk concentrates in a few specific situations:
Diets heavy in processed or shelf-stable food, or very restrictive eating patterns, are the single biggest risk factor.
Smoking raises oxidative stress and burns through vitamin C faster — the recommended intake is set 35 mg higher for smokers.
Regular alcohol use is strongly linked to poor overall diet quality and reduced vitamin C intake specifically.
Crohn's disease, certain cancers, and dialysis all increase requirements or reduce absorption.
What our test does that a checklist can't
There's no routine blood test for vitamin C the way there is for iron or B12 — it's rarely ordered outside of suspected scurvy. That makes symptom-and-diet pattern matching more useful here than for most nutrients: our free assessment weighs your fruit and vegetable intake against your specific symptoms, and checks whether something else — like iron deficiency, which also causes fatigue and can worsen when vitamin C is low (it helps you absorb iron) — is a better fit.
If you are low
The fix is usually fast and cheap: citrus fruits, strawberries, bell peppers, broccoli, Brussels sprouts, and kiwi are all excellent sources, and symptoms typically start improving within days of consistent intake. Adults need 90 mg/day (men) or 75 mg/day (women), with an extra 35 mg for smokers — easily covered by one bell pepper or a cup of strawberries. Remember that boiling destroys much of it; eating produce raw or lightly steamed preserves more.
Frequently asked questions
Related checks and reading
- → Iron deficiency test — vitamin C helps you absorb iron from plants
- → Zinc deficiency test — another immune and wound-healing nutrient
- → Vitamin C in our nutrition guide — food sources and daily intake reference
- → What vitamins should I take? — a practical decision guide
Find out in 2 minutes
Free vitamin C risk check — no email, no payment, no blood draw.