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The metabolic syndrome in the West Bank population: an urban-rural comparison
You might wonder how a pill works if you lack intrinsic factor: at very high oral doses, a small amount of B12 can be absorbed directly through the gut wall via passive diffusion, bypassing the need for intrinsic factor entirely [1] [3]
Serum levels of homocysteine, vitamin B12 and folate in patients with multiple sclerosis: an updated meta-analysis
[15] Why would someone need an injection of vitamin B instead of an oral supplement
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however, recent studies have proposed that it may promote restful sleep
