I recommend everyone to stay away from sunifiram. It is an untested drug (in clinical human trials) and this should be reason enough. It has caused temporary to persistent headaches in many people. There is good reason for it causing excitotoxicity by NMDAr overactivation. It also activates PKCa, overactivation of which causes metastatic brain cancer and other cancers. It is the height of arrogance to presume that the drug is safe and beneficial.
I wouldnt want to test this stuff on myself either, as a matter of fact I do have a sample that I wont touch.
If I recall right even the inventor of this was shocked that people allready use what he only tested on mice.
I happened to try Oxiracetam lately and think it could be a nice racetam to research a little more since it feels pretty clear and has practically no weird effects.