Vitamin B12 acts as a co-factor in many enzymatic processes, and each form of cobalamin supports different cellular functions. Deficiency — which can result from poor diet, malabsorption, or genetics and is common in older adults, vegans, and smokers — may show up as fatigue, poor balance, or low mood over time. Tri B12 Synergy combines three active forms: methylcobalamin (methylation and red blood cell production), adenosylcobalamin/cobamamide (mitochondrial energy metabolism), and hydroxocobalamin (a longer-lasting precursor and storage form). AOR Advantage: delivers B12 in its three most active, bioavailable forms from environmentally certified Green Chemistry sourcing.