I was sent vials of NAD+ that suffer from straight-up meltback... not crystallization. Confirmed by an actual (retired) chemist, not a vendor (Cain) that just seems bent on gaslighting everyone. Meltback is definitely a problem, and I find it laughable Cain tries to say it "tested" fine when he has kits of widely varying quality and condition being sent out sight-unseen. It is also laughable that he likes to posture himself as some "stand up guy," offering refunds for bad kits, when he turns right around and arbitrarily decides "that's good to go.. it's just crystallization." Partial refunds are also a joke; he should be refunding people in full and abandoning this entire product until whoever is manufacturing it gets their crap together. There seems to be a very large set of people (disciples) hellbent on refusing to believe Cain (cult leader) is not perfect and very much want to believe everything he says. Cain relies on people's ignorance in situations like this and selectively refunds those he thinks will run the most "interference" defending his... uh... honor (cough). The need to believe is very strong with this guy. He should have just cut his losses, admitted it's crap, refunded everyone, and taken up all complaints with his source. I shouldn't have to even know what "meltback" is... unfortunately due to Cain, I do now.