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Do not wait until deficiency develops
See here for further information
"Cobalamin metabolism and its clinical aspects" (PDF)
Caffeine if concentrations in urine exceed 15 micrograms/ml
Some grains, like breakfast cereals and nutritional yeast, are also fortified with the nutrient ( On the contrary, liquid vitamin B12 supplements are made synthetically in laboratories using microbes and other chemical processes
Esto significa que, aunque muchas personas reportan beneficios anecdticos, no tenemos evidencia cientfica slida que respalde su eficacia o seguridad en humanos
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