In light of, to say the least, conflicting research on D-Serine I want to bring attention to the title of this thread.
Not every available powder that acts on the brain, even if beneficially (and perhaps myopically) on paper, is a "nootropic".
Prematurely labeling substances as such, especially in thread titles, may work to cause less thorough individuals who may browse this very public forum to jump-the-gun and order whatever is being sold (idea wise).
I hold that the word "nootropic", as it is applied on this forum, should be reserved only for substances that are thoroughly vetted by research and tested by forum participants.