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Fourth, MR requires stringent assumptions, i.e., the genetic variants are associated with the exposure, no confounders of the associations of the genetic variants with the outcomes exist, and the genetic variants are not associated with the outcomes other than via affecting the relevant exposure (no pleiotropy) [17]
While B12 is naturally present in animal-based foods such as meat, fish, and dairy, many people struggle to get adequate amounts due to dietary restrictions, absorption issues, or certain medical conditions
Rajesh K, Khan MI, Mahesh P, Kumar SR, Kumar SS
AIDS, 22 (14), 1719-1728
Product copy should state what documentation is available, not imply laboratory findings are transferable to non-research settings
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