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The body readily converts cyanocobalamin to active forms through normal metabolic pathways, so bioavailability differences between B12 forms are minimal in individuals with intact conversion capacity

A double-blind randomized controlled trial revealed that atomoxetine, a selective norepinephrine reuptake inhibitor, effectively enhanced cognitive functions, such as memory, inhibitory control, and attention, in METH users (Rabiey et al., 2022)

As cells age, this process becomes less efficient, and the availability of cysteine, the primary building block, also decreases with age