I’ve looked at this in the past because of my emotional blunting. There are quite a lot of positive anecdotes and people were quite hopeful this would be a novel and effective treatment of depression especially with regard to emotional blunting. Unfortunately, as pointed out in the Wikipedia article above, it failed to meet expectations in phase II clinical trials. The company has pointed out that despite not meeting the primary target, they have measured positive effects on secondary targets and have not given up on the compound. But as far as I can tell, things have been fairly quite over the last 18 months. NSI-189 may have other therapeutic uses, but all these are still in a pre-clinical stages. Chances are very low that this will come to market in the next few years. So there is and will probably be no legal way to purchase this.
Obviously, there is a black market and if you look at depression and nootropic communities you will find quite a few people that have used this compound. The black market is a risky avenue, though, obviously. You never know what you really receive. Positive anecdotes may be placebo effect or straight shilling. The mechanism of action of this compound is not well understood. Who knows what effects this may cause now or in the future. I mean, Finasteride went through clinical trials for more than one condition, has been prescribed for decades and is largely considered safe. And we know this is not true, at least for us. So who knows what a research chemical from China or elsewhere (which may or may not be the real compound and may or may not be “pure”) can cause when even the original compound is not well tested yet.
I am as desperate as anyone to treat my emotional bluntness and from the anecdotes this compound appears interesting. If anyone wants to try this, I will read feedback with interest. But it is worth taking the risks into account.