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

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

Rely only on fermented plant foods like tempeh and unverified 'natural' sources for long-term B12 needs rather than fortified sources or supplements

Consume more leafy greens, which are consistently high in active B12 and will solve the deficiency without supplements

Increase intake of vitamin C supplements to convert plant-derived compounds into active B12 in the gut