A vegan patient has normal energy intake but low serum B12. Which practical strategy best addresses this deficiency?

• A. Use reliable vitamin B12 sources such as fortified cereals or plant milks and consider an oral B12 supplement (cyanocobalamin or methylcobalamin) as recommended by a clinician
• B. Rely only on fermented plant foods like tempeh and unverified 'natural' sources for long-term B12 needs rather than fortified sources or supplements
• C. Consume more leafy greens, which are consistently high in active B12 and will solve the deficiency without supplements
• D. Increase intake of vitamin C supplements to convert plant-derived compounds into active B12 in the gut

Answer: (A)