Elevated glutathione levels may reflect an accumulation resulting from impaired recycling, often due to deficiencies in NADPH, selenium, or riboflavin (vitamin B2). This indicates a disruption in the redox balance rather than 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 Nutritional Assessment: Riboflavin Chapter 7 Flashcards Quizlet Exploring the role of riboflavin in swine well being: a literature review Porcine Health Management Springer Nature Link Protocol for measuring erythrocyte glutathione reductase activity coefficient to assess riboflavin status ScienceDirect