BiomarkersVitamin C
Vitamins
Vitamin C
Antioxidant for immunity, skin and iron absorption
On your report it may say: Ascorbic acid, Plasma vitamin C
Vitamin C is needed for collagen, immunity and absorbing iron from plant foods. It's rarely part of routine panels, and the body doesn't store much, so levels reflect recent intake.
Typical ranges · mg/dL
µmol/L = mg/dL × 56.8
Not having this test doesn't mean you're deficient; it simply isn't on most panels.
Ranges vary by lab, age and sex. The range printed on your report applies.
If it's low
Intake has been low recently; severe deficiency (scurvy) is rare but still occurs.
Common causes
- Few fruits and vegetables
- Smoking
- Restrictive diets
- Heavy alcohol use
What you might notice
- Easy bruising
- Bleeding gums
- Slow wound healing
- Tiredness
If it's high
Usually from supplements; very high doses can raise kidney stone risk in some people.
Common causes
- High-dose supplements
What you might notice
- Loose stools at high doses
Testing
- Who should test
- People with very limited diets, smokers, or signs like bleeding gums and easy bruising.
- How to prepare
- Fasting is usually required; the sample must be handled quickly by the lab.
- When to retest
- 4–8 weeks after changing intake.
What can help
Food sources
See a doctor if you have bleeding gums, easy bruising or slow-healing wounds.
Common questions
Is amla a good source?
Yes, it's one of the richest natural sources.
Do I need a test?
Most people can judge intake from diet; testing is for unclear cases.
Explore further
When to take them
Sources
Free nutrition assessment
Not sure what your body needs?
Answer a few questions about your diet, lifestyle and goals, and SYNC builds a personalised supplement plan with the reason for every suggestion. Free, about 6–8 minutes.
Build My Nutrition PlanFor general education only, not medical advice. Ranges shown are typical for adults; the range printed on your lab report applies. Talk to a qualified doctor about your results.