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EClinical Medicine, 29-30, 100587

10.3390/genes10030236 40

Methylcobalamin is preferred over cyanocobalamin (the synthetic form) in many clinical settings because it is the metabolically active coenzyme form of B12, meaning the body can utilise it immediately without further conversion

Some studies in older adults have either linked lower 25-hydroxyvitamin D levels with measures of poor cognitive performance (50-53) or higher 25-hydroxyvitamin D levels with measures of better cognitive performance (54, 55)

Moreover, this trial was conducted at a private practice and published in an alternative medicine journal, again raising concerns about bias

Reactive oxygen species and sperm DNA fragmentation