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The Grading of Recommendation, Assessment, Development, and Evaluation (GRADE) tool was used to assess the certainty of the evidence for the two primary biochemical outcomesserum vitamin B12 concentration increase and homocysteine reductionacross all included studies, and separately for randomised controlled trials (RCTs) and observational studies
However, the lack of human safety data, economic disincentives, and doping controversies underscore the challenges ahead
Restoring NAD+ levels is one of the most promising areas of longevity research, particularly when combined with complementary metabolic compounds
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