Vitamin B2 (Riboflavin) - glutathione reductase activity



Body levels of B vitamin levels are best determined using enzyme dependent activity tests. Direct measurements of the vitamins are affected by dietary intake and nutritional supplementation.

In our tests for vitamins B2 we measure the change in enzyme activity (glutathione reductase [EGR] ) before and after the addition of excess vitamin.

Reference ranges:

B2 (Riboflavin) <1.20 normal, 1.20 - 1.30 borderline, >1.30 deficient

Results expressed as ratio of activated to basal activity in IU/gHb

Included in Profiles:

B vitamin profile and full vitamin profile

hair mineral analysis sample test resultsSample Report:

rep-bvitamins.pdf (Click to Download)

Sample Requirements:

Green (lithium heparin)- must reach the lab within 24 hours of collection.

Postal Samples Acceptable:


For further details please contact the laboratory at: