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Here are some groups at higher risk of deficiency: People with gastrointestinal issues: Conditions like pernicious anaemia, Crohns disease, or those who have undergone gastric bypass surgery can affect B12 absorption
Choosing the right syringe size Insulin syringes come in three common sizes: 0.3mL (30 units), 0.5mL (50 units), and 1.0mL (100 units)
2005 Mar;28(3):335-42
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