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Vitamin B2 (Riboflavin)

Vitamins

Vitamin B2 (Riboflavin)

Also known as: Riboflavin, B2

COMMON RANGE

2.66 – 50.5

nmol/L

55.3

Mayo Clinic Laboratories

Adult

↗

See all sources ↓

Reference ranges across 10+ sources

Adult reference ranges from 3 entries across 3 named sources, shown in nmol/L. Compare side-by-side.

SOURCE

SEX

AGE

RANGE

VISUAL

CITE

ARUP Laboratories

All

≥18y

5 – 50 nmol/L

↗

Mayo Clinic Laboratories

All

≥18y

2.66 – 50.5 nmol/L

↗

Quest Diagnostics

All

≥18y

6.2 – 39 nmol/L

↗

ARUP Laboratories

All · ≥18y

↗

5 – 50 nmol/L

Mayo Clinic Laboratories

All · ≥18y

↗

2.66 – 50.5 nmol/L

Quest Diagnostics

All · ≥18y

↗

6.2 – 39 nmol/L

About Vitamin B2 (Riboflavin)

B vitamins are nutrients that your body needs to work well and stay healthy. There are eight different types. A vitamin B test checks the level of one or more B vitamins in a sample of your blood or urine (pee). Vitamin B2, also called riboflavin, helps your body break down fats, carbohydrates, and proteins so it can use them for energy.

All the B vitamins together are called the "B vitamin complex." Each type of vitamin B plays different important roles in your body.

You get B vitamins from many foods, including leafy green vegetables, meats and fish, eggs, whole grains, milk, and other dairy products. A lack of vitamin B is rare in the United States, because many foods have added B vitamins. These foods include cereals, breads, and pasta.

Main source: MedlinePlus ↗

Useful for

Checking your vitamin B2 (riboflavin) level when you have symptoms that suggest you may not be getting enough

Helping evaluate symptoms that can be caused by riboflavin deficiency, such as sores or cracks around the mouth, skin changes, eye problems, anemia, or mood changes

Helping investigate poor nutrition or conditions that affect how your body absorbs vitamins

Main source: MedlinePlus ↗

Interpretation

Your results will show the amount of vitamin B2 in your sample. If your level is normal but you still have symptoms, you may need other tests to find the cause.

If your vitamin B2 level is low, you may have a deficiency. Symptoms of riboflavin deficiency are not very specific, but can include sores or cracks around the mouth and skin, eye changes such as new blood vessels growing into the cornea, anemia, and changes in mood or behavior. Your provider may recommend dietary changes or a supplement, and may look for an underlying reason such as poor nutrition or a problem with how your body absorbs nutrients. In certain cases, vitamins may be given by intravenous (IV) treatment.

If you have questions about your results, talk with your provider.

For general wellness information only. Talk to a clinician about your specific results.

Main source: MedlinePlus ↗

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Related biomarkers

Often tested alongside vitamin b2 (riboflavin) or part of the same panel.

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Sources

ARUP Laboratories

Mayo Clinic Laboratories

Quest Diagnostics

Last updated 2026-05-02

This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.

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