NSI-189 (NSI-189 Phosphate (Neurogenic Compound))
A small molecule stimulating hippocampal neurogenesis. Developed for MDD, it increases hippocampal volume measurable by MRI and improves cognition independent of mood effects.
How it works
Stimulates hippocampal neural stem cell proliferation and differentiation via Akt/CREB/BDNF signaling. Increases hippocampal volume visible on MRI.
Key facts
- Molecular weight: 366.4 Da
- Half-life: 18-22 hours
- Bioavailability: High (oral)
- Storage: Room temperature, protected from moisture.
Dosing overview
- Typical dose: 40-80 mg
- Frequency: Once daily
- Duration: 8-12 weeks
- Route: Oral
Reported benefits
- Hippocampal neurogenesis
- Measurable brain volume increase
- Cognitive enhancement
- Antidepressant effects
- Long-term neural benefit
Possible side effects
- Headache
- Insomnia
- Agitation
- Dizziness
- Suicidal ideation (monitor)
Research
- NSI-189 Phase 2 in MDD (2019): Significant cognitive improvements (SDR, CogScreen) vs placebo but missed primary depression endpoint.
- Hippocampal volume changes with NSI-189 (2020): 4% hippocampal volume increase after 12 weeks vs 1% decrease in placebo on MRI.
Community reviews of NSI-189
- recon_math_ray rated it 5/5 - Worth adding to the protocol: NSI-189 has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.
- bac_water_betty rated it 5/5 - Genuinely effective after 2 weeks: Been using NSI-189 for about 2 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- peptidehead_rational rated it 4/5 - helped my focus, but my sleep got weird: i ran nsi-189 phosphate for about 8 weeks while working pa shifts and trying to keep up with training on the east coast grind. for me it seemed to sharpen focus and mood a bit, but i also noticed lighter, choppier sleep. still a solid 4 stars.
- researcher_mel rated it 5/5 - NSI-189 sharpened my foggy mornings: I ran NSI-189 for about 12 weeks, mostly because my brain felt like it was stuck in Jersey traffic some mornings, and I wanted something that might help me think cleaner while juggling pharmacy work and my own training. For me, the change was pretty obvious. I felt more mentally organized, less sluggish, and weirdly more steady in the afternoon instead of hitting that usual wall. Could be placebo, sure, but it did not feel like it. Anecdotally, my mood was better too, just lighter. I’d call it one of the few nootropics I’d actually bother with again.
- frugalrobin rated it 4/5 - Helped my foggy winter focus, but felt a bit flat: I tried NSI-189 after a long grey winter in Poland, when my data work felt like wading through mud and even my training was meh. For about 6 months, it seemed to make my thinking cleaner, like I could hold a thread in my head longer, and my mood was a bit less heavy. The odd part was it also felt slightly flat at times, not bad, just less spark. For me, that was the only caveat.
- careful_claire rated it 4/5 - Noticed clear benefits within weeks: Added NSI-189 to my protocol about 3 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
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Community discussions about NSI-189
Research and educational reference only. Not medical advice.