Vitamin B2 for Thyroid Health Thyroid Dietitian: Nicole Morgan, RDN, LD, CLT Glutamax Tablet Provital International How to assess Vitamin B2 Status? B2 nutritional status is assessed through the ERYTHROCYTE GLUTATHIONE REDUCTASE ACTIVITY COEFFICIENT (EGRAC), which should be < 1.2. What is this coefficient? FAD Pedro Carrera Bastos Elemental Selenium and Vitamin B2 (riboflavin) are essential for glutathione use and recycling. Selenium is really low in Australian soils, and people are commonly deficient. Signs of low B2 are blood PDF) Riboflavin (vitamin B2) and oxidative stress: A review Vitamin B2 Riboflavin 100 Veg caps