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Vegans or vegetarians sometimes have lower B12 levels because plant based foods lack substantial amounts of this nutrient

PLOS One

Pooled protein dialysate concentration was determined by UV spectroscopy, portioned into 120 uL aliquots with 20% final glycerol concentration, flash-frozen in liquid nitrogen, and stored at 70 C

Playing off the rich, fatty texture, acidic foods such as tomato, pickled onions, citrus juice or zest, vinegar and vinegar-based condiments such as hot sauce and mustard complement tinned fish

Because Vitamin B12 requires proper digestive absorption, some individuals choose IV delivery for direct availability in the bloodstream, which removes dependence on gastrointestinal uptake