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Vitamins

Vitamin B1 (Thiamine)

Vitamin B1 (thiamine) is considered essential for converting carbohydrates into energy during exercise. Active individuals may have higher requirements due to increased metabolic demands. A healthcare provider can help assess whether your levels support optimal performance.

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
nmol/l
Low 66.5 Normal 200 High
Female Your group
nmol/l
Low 66.5 Normal 200 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

What It Measures

This test measures thiamine (vitamin B1) levels in your blood, expressed in nmol/l. It may help assess whether your body has adequate thiamine to support energy metabolism and neurological function. Your healthcare provider can interpret results in context.

Why It Matters

For active individuals, thiamine may play a critical role in aerobic energy production and recovery. Suboptimal levels have been associated with decreased endurance and slower recovery times. Discuss your results with a sports medicine professional for targeted guidance.

When to Test

Testing may be considered when experiencing unexplained fatigue, tingling in extremities, or cognitive difficulties. Healthcare providers may also recommend testing for individuals with restrictive diets, chronic alcohol use, or gastrointestinal conditions that may affect absorption.

Symptoms

Low Levels

Some people with low vitamin B1 may experience fatigue, irritability, poor memory, or tingling in the hands and feet. In more pronounced cases, muscle weakness and difficulty walking have been reported. A healthcare provider can help determine the cause.

High Levels

Elevated vitamin B1 levels are generally considered uncommon since excess thiamine is typically excreted by the kidneys. Some people may rarely experience mild reactions. If your levels appear elevated, your healthcare provider can advise on appropriate next steps.

Lifestyle Tips

Foods considered rich in thiamine include whole grains, legumes, pork, and fortified cereals. Some people may benefit from reducing processed food intake. Cooking methods such as steaming may help preserve thiamine content. Discuss dietary changes with your healthcare provider.

Frequently Asked Questions

What foods are high in vitamin B1?
Foods generally considered good sources of thiamine include whole grains, pork, legumes, nuts, and fortified cereals. Your healthcare provider or a dietitian can help you plan a balanced diet that supports adequate B1 intake.
Can vitamin B1 deficiency cause nerve damage?
Prolonged thiamine deficiency may be associated with nerve damage in some cases. This is sometimes referred to as peripheral neuropathy. Early detection through testing and consultation with your healthcare provider may help address concerns before they progress.
Does alcohol affect vitamin B1 levels?
Chronic alcohol consumption is believed to impair thiamine absorption and increase its excretion. Healthcare providers may recommend B1 monitoring for individuals with significant alcohol intake. Discuss your specific situation with a qualified professional.

Tests with related values

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

Health Checkups

InsideTracker

A 36-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 Magnesium (Intracellular) 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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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
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A 44-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count
€499,-

Vitamin B1 (Thiamine)

€47,-