LounaLab service will close June 18th. As of today, products can no longer be purchased there.

All purchased appointments and test results are safe and are available here until the stated date, then transferred to the current SYNLAB service. For more details see the news or contact our representative.

Vitamin B2


Vitamin B2 helps the body to produce energy, and it is involved in the functioning, growth, and development of cells. In addition, it is involved in the metabolism of lipids, medicinal agents and steroids – and, if necessary, also other B vitamins. Furthermore, vitamin B2 maintains the balance of the amino acid homocysteine in the blood. It is also called riboflavin.

We get vitamin B2 from eggs, liver, kidneys, low-fat meat and milk, green vegetables, and whole-grain products.

When should vitamin B2 levels be measured?

Riboflavin deficiency can cause:

  • skin disorders
  • throat pain
  • sores in the corners of the mouth
  • swollen and cracked lips
  • liver disorders
  • hair loss
  • reproductive and nervous system disorders
What does a vitamin B2 test measure?

Measuring the level of vitamin B2 in the blood indicates whether the body has enough vitamin B2.

The test does not give the reason for the deficiency, namely, whether vitamin deficiency is caused by insufficient intake or an absorption disorder.

Normally, the result is:

Reference values:

  • 136 - 370 µg/l

The reference values of this examination have changed 11.10.2021. You will find your own result's reference values from My LOUNA in touch with the graph. Read more about defining reference values.

Please contact your physician or other healthcare professional if you suspect an illness or need help interpreting the results.

Excessive intake of vitamin B2 is rare. It can be caused by eating products with high amounts of supplemented B vitamins. These include nutritional supplements.

Long-term vitamin B2 deficiency can cause anaemia and cataract. Deficiency is seen in people who consume high amounts of alcohol, those with absorption disorders, the elderly, vegetarians, and in connection with liver diseases. Vitamin B2 deficiency also occurs in women who are pregnant or breastfeeding.


Fasting is not required

This examination does not require fasting