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A small number of people are allergic to B12, but this is rare
The life cycle of a red blood cell is 90 days, so you will not reach your optimal improvement until after 90 days, when all malformed red blood cells have died off
et al.: Surfactant therapy: past, present and future
When B12 levels become low, symptoms can affect daily life, making it harder to concentrate, stay energised, or feel like yourself
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