Follow Instructions: The dose and schedule are strictly determined by the doctor based on your blood test results and clinical status
Sources: Institute of Medicine, Food and Nutrition Board, National Academies of Science, Dietary Reference Intakes (DRI): Recommended Dietary Allowances and Adequate Intakes , USA 2018, Mustafa Vakur Bor, Kristina M von Castel-Roberts, Gail PA Kauwell, Sally P Stabler, Robert H Allen, David R Maneval, Lynn B Bailey Ebba Nexo Daily intake of 4 to 7 g dietary vitamin B-12 is associated with steady concentrations of vitamin B-12related biomarkers in a healthy young population Am J Clin Nutr 2010 91: 3 571-577
Clinical ophthalmology (Auckland, N.Z.), 1(3), 201207
Then, in the 70s, that number increased to once every two months