We speculate that this difference in results might be related to the type of Se supplementation, dose, duration of treatment and the status of other nutrients in the subjects organism
These naturally occurring forms of B12 (methylcobalamin, hydroxocobalamin, and adenosylcobalamin) are recommended by doctors as superior to cyanocobalamin for treating vitamin B12 deficiency
10.1152/ajpgi.1999.277.1.G120 27 CrespyV.AprikianO.MorandC.BessonC.ManachC.DemignC.et al (2001)
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NAD infusion therapy is often used with the goal of supporting mitochondrial function and cellular metabolism, although clinical outcomes may vary [4] Why NAD+ Levels Decline With Aging Aging places increasing demands on cellular repair mechanisms