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Vitamins

Vitamin C Blood Test

Vitamin C is considered a critical antioxidant for active individuals, potentially supporting immune function during intense training and aiding tissue repair and recovery. Active individuals may have increased vitamin C requirements. Consult a sports medicine professional for guidance.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
umol/l
Low 26 Normal 85 High
Female Your group
umol/l
Low 26 Normal 85 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Vitamin C: what this test measures

This test measures vitamin C (ascorbic acid) levels in your blood, expressed in umol/l. It may help assess whether your body has adequate vitamin C for immune function and antioxidant protection. Your healthcare provider can interpret results in your clinical context.

Vitamin C: why this value matters

For active individuals, vitamin C may help protect against exercise-induced oxidative stress, support collagen synthesis for joint and tendon health, and maintain immune function during heavy training. Suboptimal levels may affect recovery. Discuss your results with a sports medicine professional.

Vitamin C: when is testing worthwhile?

Testing may be considered when experiencing slow wound healing, frequent infections, easy bruising, or fatigue. Healthcare providers may also suggest testing for individuals who smoke, have limited fruit and vegetable intake, or have conditions affecting nutrient absorption.

Vitamin C: symptoms of a high or low value

Low Levels

Some people with low vitamin C may experience fatigue, easy bruising, slow wound healing, swollen or bleeding gums, and dry or rough skin. Frequent infections may also occur. In severe cases, scurvy may develop. A healthcare provider can help assess your symptoms.

High Levels

Very high vitamin C intake, typically from supplementation, may sometimes cause digestive discomfort, including diarrhoea and nausea. Some people may experience kidney stone risk at very high doses. Consult your healthcare provider about appropriate intake levels for your situation.

Vitamin C: lifestyle and this value

Foods considered rich in vitamin C include citrus fruits, berries, bell peppers, broccoli, and kiwi. Vitamin C is heat-sensitive, so raw or lightly cooked foods may retain more. Some people may benefit from increased intake during illness. Discuss supplementation with your healthcare provider.

Vitamin C: frequently asked questions

Can vitamin C help prevent colds?
While vitamin C is widely used during cold season, research on its preventive effects is considered mixed. Some studies suggest it may slightly reduce cold duration in certain populations. Regular adequate intake may be more beneficial than high doses during illness. Consult your healthcare provider.
Does cooking destroy vitamin C?
Vitamin C is considered heat-sensitive and water-soluble, so prolonged cooking or boiling may reduce its content in foods. Steaming, microwaving, or eating raw fruits and vegetables may help preserve more vitamin C. Your healthcare provider or dietitian can offer specific dietary guidance.
Can smokers have lower vitamin C levels?
Research suggests that smoking may increase oxidative stress and deplete vitamin C more rapidly. Healthcare providers may recommend that smokers consume more vitamin C-rich foods or consider supplementation. Discuss your specific needs with a qualified health professional.

Tests with related values

These panels measure values from the same category as this marker.

Whoop

Whoop Women's Health

A 53-biomarker women's health panel inspired by the WHOOP Women's Health Panel — fertility, cycle and thyroid hormones plus a complete metabolic and nutrient base.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) AMH (Anti-Müllerian Hormone) Progesterone Prolactin TPO Antibodies Free T3 (Triiodothyronine) Free T4 (Thyroxine) Leptin Vitamin B12 Folate (Folic Acid) Phosphorus
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Health Checkups

InsideTracker

A 35-biomarker performance and longevity panel inspired by InsideTracker Ultimate — covering heart, hormones, metabolism, inflammation, recovery and iron status.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count
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Whoop

Whoop Performance Health

A 50-biomarker performance panel inspired by the WHOOP Performance Health Panel — recovery, blood production, thyroid, hormones, iron and nutrient status for people who train.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) IGF-1 (Insulin-like Growth Factor) Creatine Kinase (CK) Reticulocytes Free T3 (Triiodothyronine) Free T4 (Thyroxine) Vitamin B12 Folate (Folic Acid)
€689,-
Complete Health

360 Health

Broad health panel: hormones, thyroid, vitamins, lipids, liver, kidney, and blood count.

HbA1c (Glycated Hemoglobin) TSH (Thyroid Stimulating Hormone) Triglycerides Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Free T4 (Thyroxine) LDL Cholesterol Liver Function Test (LFT) SHBG (Sex Hormone Binding Globulin) Vitamin B12 Vitamin D (25-OH) Total Testosterone Free T3 (Triiodothyronine) Ferritin HDL Cholesterol Albumin Total Cholesterol Basic Blood Count
€346,-

Medical reviewer

Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
CIBG Ministerie van Volksgezondheid,
Welzijn en Sport Official BIG registration BIG 49928676701 Opens in a new tab

Vitamin C

€59,-