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Researchers should use appropriate laboratory tools and equipment to ensure accurate and sterile results
Every injection is administered by a trained healthcare professional
Sufferers of pernicious anaemia, which causes memory loss, extreme fatigue and irrational behaviour, receive an NHS vitamin B12 jab every three months
Finally, B12 is required to make myelin, the protective layer that coats nerve cells. B12 also works alongside folate to produce red blood cells, and without adequate B12 those cells grow abnormally large and lose their ability to carry oxygen efficiently
The changes are subtle but detectable
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