I was doing a lot of research and I don't think I trust any of the companies that sell "longevity" supplements.
A study revealed over 90% of NMN was fake.
Most of the companies that sell NMN, fisetin, CAAKG, etc. are shady AF. They market HEAVILY (this always turns me off, having spent a decade in internet marketing, I feel like I can tell spam when I see it). They make up stuff. Some sell "lipo" versions of everything with "enhanced absorption" yet there is no data whatsoever that this even does anything.
At least one company selling CAAKG makes their own CoAs. I mean come on. I emailed them and they said it's to protect themselves from competition. This doesn't even track. Why would your competition knowing who you use to examine your product be a problem? However, these guys just make their own quality analysis in Excel.
Another popular company that sells a dozen or so products (some of which are various forms of NMN), has like 50 categories on their website. Why do you need 50 categories for a dozen products? That doesn't even make sense. No matter what you click on, you see mostly the same products. Uncomfortable. It's as if they're just trying to sell as much as possible.
Many (but not all) companies sell a brand of NMN called "Uthever." According to at least one paper, Uthever doesn't raise NAD levels.
Many of them sell Resveratrol. Resveratrol is useless in humans (prove me wrong).
Some places don't even have analyses, but "trust us, it's the best quality, that's why we have so many return customers."
Sure.