Including cortisol in your panel actually confirms this selectivity
The absorption speed of B12 depends on whether someone takes sublingual tablets that dissolve under the tongue or requires B12 injections
Miriyala S, Thippakorn C, Chaiswing L, Xu Y, Noel T, Tovmasyan A, et al
343 Supplements like Metanx , which contains L-methylfolate, methylcobalamin, and pyridoxal-5-phosphate, have improved symptoms by enhancing endothelial function and restoring neurotrophic support
Patient Management and Practical Recommendations Pre-treatment Tests to be Performed Plasma Carnitine Levels: To see if you are actually deficient before starting
Feng C, Chen Y, Pan J, Yang A, Niu L, Min J, et al