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And even some meat eaters dont absorb it as well as they might

1.5 g according to the UK National Health Service (NHS) and British Nutrition Foundation (BNF) Increased requirement: 5 g factors which increase an individuals B12 requirement are illness, stress, toxic stress, pregnancy and breastfeeding Dietary Supply or Supplement Requirement

Benefits of Oral Supplements Limitations of Oral Supplements Comparing Treatment Effectiveness Clinical studies demonstrate both methods effectively treat vitamin B12 deficiency when appropriately selected for individual patient needs

This happens because the body doesnt have enough healthy red blood cells to transport oxygen efficiently throughout the body