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Oral versus intramuscular administration of vitamin B12 for vitamin B12 deficiency in primary care: a pragmatic, randomised, non-inferiority clinical trial (OB12)
This pattern suggests that oral bioavailability may vary significantly between individuals and that systemic effects require adequate absorption that not everyone achieves
B12 is necessary for digestion, protein synthesis, absorption of foods and the metabolism of fat and carbohydrates
Freezing may compromise benzyl alcohol concentration and vial integrity
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