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T.LebofskyM.FarhoodA.et al (2015)
If your body lacks sufficient B12 due to dietary reasons (e.g., youre vegan and not supplementing) or, more commonly, due to an inability to absorb B12 from your gut (e.g., pernicious anaemia, certain stomach conditions, or medications), then replenishing those levels with an injection will directly address the cause of your fatigue
Methods Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) protocol recommendations were followed 13 and was registered at the International Prospective Register of Systematic Reviews (PROSPERO) under the number CRD42016953346
It is a tripeptide, which is a fancy way of saying it is made from three specific amino acids: cysteine, glutamate, and glycine
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