I have no reason to believe that one brand is categorically better than another so I typically buy from someplace like puritans pride because of cost. Seems to work. From the website it’s cheaper than if you buy from their Amazon store.

But I wouldn’t call this a recommendation, more if a report of my choice and my reasoning.

I’m sure there are “better” options, but I don’t care if I have to ingest 200 mg of one brand to get the benefit I would get from 100mg of another brand, for 4x the price. In all I’d rather buy from a source that moves a lot of production and is less likely to be counterfeited or suffer from production inconsistencies.

But that’s just like, my unfounded and poorly considered opinion so…

I've had great experiences with Nootropics Depot in terms of both product purity and customer service.

I'll second the recommendation for Nootropics Depot. They're top notch with regard to testing (they run an ISO 17025 accreddited lab), and the owner frequently talks about the science of how various compounds work and interact on r/NootropicsDepot.

Solgar has been my go-to for a long time.