A private group I am a member of found that reconstituted PGB NAD+ that originally tested at 653.69mg stays above 600mg for at least two weeks, but that it degraded all the way down to 443.19mg after 30 days. For people on a 50mg or 100mg, probably not a problem to kill the vial in two-weeks but for people on 25mg or micro-dosing after 14 days you're pinning degrade product. We're not sure how quickly it degrades between day 14 and day 30 but will have this answer in a couple of months.