Not sure about above, but I used to (~1yr ago) buy NSI-189 from THT.CO and other sources compiled&#x2F;tested by the reddit r&#x2F;nootropics community. Apparently since then, Neuralstem has sent cease &amp; desist letters to all of the companies selling it, and sources have since been spotty. Also I know that some group buys&#x2F;syntheses have been coordinated on Longecity.