If you have kept the vial at 2 to 8 C the entire time (no fridge failures, no transit exposures, no freezer accidents), the manufacturer stands behind the labeled shelf life
Starting at too high of a dose or increasing the dose too quickly can lead to symptoms such as indigestion, nausea, vomiting, diarrhea, or constipation
NAD enhances metabolism, maintains cellular energy, and supports DNA repair processes
Br J Nutr 110 Seale LA, Torres DJ, Berry MJ, Pitts MW (2020) A role for selenium-dependent GPX1 in SARS-CoV-2 virulence
GSH augmentation deserves investigation as a beneficial therapeutic approach for not only PD but also numerous other CNS disorders for which GSH deficiency and GSH-related enzyme deficits have been documented (multiple sclerosis, 25,26 autism, 2729 Alzheimers disease, 30,31 schizophrenia, 32,33 and bipolar disease 34 )
Effects of glycyl-histidyl-lysyl chelated Cu (II) on ferritin dependent lipid peroxidation