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
For others, it might take a few weeks of consistent injections before you notice a change if your symptoms are more complicated, such as numbness, exhaustion, or memory problems
The Israel Medical Association Journal
As a result, we decided to step up and offer pure methyl B12 shots, so you can take control of your health and prevent further nerve and brain damage
However, its common for blood tests to reveal inaccurate information regarding B12 levels since a high percentage is stored in the liver and not always revealed through testing