If you’ve spent any time on the back end of the nootropic forums in the last decade, you’ve seen the same two compounds come up over and over: Selank and Semax. Both were developed at the Russian Academy of Medical Sciences in the 1990s. Both are used clinically in Russia and a handful of CIS countries for anxiety, cognitive impairment, and stroke recovery. Both are essentially unknown in Western mainstream medicine. And both are, in my opinion, two of the most useful peptides a high-functioning person can have in their toolkit.
I’ve been running this stack for almost five years now. I use Selank for state — that means anxiety control, social presence, evenness — and Semax for trait — focus, learning, deep work. Here’s the full breakdown.
Semax — the focus peptide
Semax is a synthetic heptapeptide derived from the N-terminal fragment of adrenocorticotropic hormone (ACTH 4–7). The original Russian researchers tweaked the structure to remove the steroidogenic activity while preserving the central nervous system effects. The result is a compound that increases BDNF (brain-derived neurotrophic factor), increases NGF (nerve growth factor), and modulates several monoamine systems in a way that produces a clean, sustained focus state without the harsh edge of a stimulant.
It’s been used in Russia since 1995 for stroke recovery, optic nerve atrophy, ADHD in children, and general cognitive enhancement. It’s on the World Anti-Doping Agency banned list for athletes because of its CNS-stimulating effects.
How I use Semax
Form: intranasal solution, 0.1% concentration. 2 sprays per nostril delivers approximately 200 mcg, which is my standard morning dose. Some users go up to 500 mcg per day; I find anything above 300 mcg loses the clean focus signal and starts pushing into a slightly anxious headspace for me.
Timing: first thing in the morning, before caffeine. Onset is roughly 10–20 minutes. The window of effect is 4–6 hours. I dose at 7 a.m. before the household wakes up and the energy is sharp until lunch.
Frequency: 5 days on, 2 days off. I take weekends off because BDNF receptors do have some adaptive downregulation and I prefer to keep the response clean. I also do a full week off every 8 weeks.
What Semax actually feels like
The cleanest comparison I can offer is this: caffeine gives you energy at the cost of edge. Adderall gives you focus at the cost of personality. Semax gives you focus without taking anything away. There’s no jitter, no rebound crash, no tunnel vision, no irritability. You sit down to write or to do deep work and you just… do it. Distraction doesn’t disappear, but it stops winning. Two hours pass and you’ve gotten the work done.
I write a lot of content. Books, articles, scripts for the YouTube channels. Semax is what I use to get into the writing chair every morning. It is not a creativity drug — creativity happens during walks, conversations, and recovery — but it is a get-it-onto-the-page drug, and that’s most of the actual work.
The mood lift is real but subtle. Mild anti-anxiety effect, slight elevation in baseline well-being. Some users report a noticeable euphoria; I don’t. For me it’s more of a steadying effect.
Selank — the calm peptide
Selank is the anxiolytic counterpart. It’s a synthetic analog of tuftsin, a naturally occurring tetrapeptide, modified for stability. It modulates GABA, serotonin, and brain-derived neurotrophic factor signaling. In Russian clinical use it’s prescribed for generalized anxiety disorder, neurasthenia, and post-traumatic stress symptoms.
The reason this matters: Selank produces an anxiolytic effect comparable to benzodiazepines in some animal studies, without the GABA-A receptor binding that drives benzodiazepine dependence, withdrawal, and cognitive impairment. There is no tolerance development, no addictive potential, and — critically — no sedation.
How I use Selank
Form: intranasal solution, 0.15% concentration. 3 sprays per nostril delivers approximately 450 mcg, which is my standard dose.
Timing: situational, not scheduled. Unlike Semax, which I run daily, Selank I use specifically on high-stakes days. Filming a video, doing a podcast interview, navigating a tough conversation with a partner, dealing with a high-stress business situation. I dose 20–30 minutes before the event.
Frequency: maybe 2–3 times per week on average. Sometimes more during travel-heavy weeks, sometimes not at all if life is calm. It’s a tool, not a foundation.
Stacking: I do not combine Selank and Semax in the same dose window the first time I use them together. The two peptides have complementary effects but also overlap in mechanism. Most users tolerate the combination fine. I prefer to test response to each individually before stacking.
What Selank feels like
Selank is one of the strangest compounds in my toolkit because the effect is so subtle that the first few times I tried it I assumed it wasn’t working. Then I’d notice halfway through a stressful situation that I just… wasn’t stressed. My heart rate wasn’t elevated. I wasn’t catastrophizing in my head. I was present.
The way I describe it to friends: Selank doesn’t make you happy. It makes you fine. It removes the noise. Your baseline emotional state stays where it would be without it, but the anxious overlay that normally rides on top of everything is gone.
This is particularly useful in my situation. I live in Pattaya with a household of partners. The household is built on transparency — we have a daily check-in where every partner shares what’s going on emotionally and where everyone gets heard. That kind of constant relational attentiveness takes energy. Selank gives me the calm and presence to show up fully without burning the reserves I need for everything else I’m running.
The combined daily routine
For a normal weekday, here’s the actual routine:
6:30 a.m. Up, water with electrolytes, brief mobility work.
6:45 a.m. Semax intranasal, 200 mcg.
7:00 a.m. 8 oz of coffee. Caffeine and Semax don’t compete; they layer beautifully if the Semax goes in first. I keep caffeine to under 200 mg per day to avoid receptor downregulation.
7:15 a.m. to 11:30 a.m. Deep work block. Writing, content, scripts, business planning. The Semax window covers this entire stretch and no other intervention is needed.
11:30 a.m. Brief walk, sunlight, light snack.
12:00 p.m. Household time. Lunch with partners, daily check-in, planning the rest of the day. No additional peptide.
If a high-stakes event is on the calendar for the afternoon: Selank 450 mcg, 20 minutes before. Otherwise the Semax morning dose is the only nootropic intervention for the day.
4:00 p.m. Training. Heavy resistance work, 60–90 minutes. No peptide in this window — I want my CNS to do the work.
Evening: Family time, presence, no compounds. The goal is to have built enough capacity through the day that the evening doesn’t need pharmacological help to be enjoyable.
Side effects — what I’ve actually seen
In five years of use across myself and dozens of friends I’ve shared this stack with, the side effect profile is one of the cleanest in any nootropic category I’ve tested.
Semax side effects: Occasional mild headache the first few days of restarting after a break. Slight irritability if dosed too late in the day — anything past 2 p.m. and I’m reaching for melatonin at night. Some users report dry mouth. No cardiovascular effects, no blood pressure changes, no impact on sleep when dosed appropriately.
Selank side effects: Almost nothing. A small percentage of users report a brief brain fog at high doses (above 600 mcg). I’ve never personally experienced any. No tolerance development. No withdrawal effects. No sedation.
The cleanest comparison: I have tried prescription anxiolytics (alprazolam, propranolol), I have tried nootropics from the racetam family (piracetam, oxiracetam, phenylpiracetam), I have tried modafinil, I have tried microdoses of various less-legal compounds, and the only thing in this category that I’ve stuck with for more than 18 months is the Selank/Semax stack. That’s the cleanest endorsement I can give.
Sourcing and quality
The peptide market is murky and the intranasal solution market is even murkier. Here’s how I think about quality:
Reconstitution-from-lyophilized is the safest path. You buy lyophilized peptide from a vendor with third-party COA testing, you reconstitute with bacteriostatic saline (Selank with about 0.9% saline preserved with 0.9% benzyl alcohol), you store it in a 5 mL nasal spray bottle in the fridge, and you use it within 2–3 weeks.
Pre-mixed nasal sprays are convenient but variable. Concentrations can drift, preservatives can be inadequate, and some products have shown lower than labeled potency on third-party testing.
Reputable sources publish certificates of analysis. If a vendor cannot show you a COA for the specific lot, walk away. The cost of a vial of lyophilized Selank or Semax from a reputable source runs $30–60 per vial, and that vial typically lasts a month at the protocols I described above. That’s not a market where you should be chasing a discount.
Who shouldn’t use this stack
This is a short list because the safety profile is so clean, but it exists.
Pregnant or breastfeeding women — both compounds lack human safety data in these populations. Anyone on prescription anxiolytics or stimulants should clear additions with their prescriber. Children should not be self-dosing peptide-based nootropics outside of formal medical supervision. Anyone with a history of psychosis should be cautious with anything that modulates monoamine signaling, including these.
Beyond those buckets, the Selank/Semax stack has one of the gentlest safety profiles of any nootropic category I’ve explored, and the upside for a high-functioning person trying to extract more from their cognitive day is substantial.
How this stack fits the broader picture
I want to be clear: peptide nootropics are not the foundation. The foundation is sleep, training, sunlight, nutrition, and meaningful work. If those aren’t dialed in, no peptide is going to fix anything. I’ve written about the foundation pieces extensively across the site, including my piece on cold plunge and red light protocols and my thoughts on looksmaxxing as a holistic concept.
Once the foundation is in place, peptide nootropics are a multiplier. They take the work you’re already doing and make it more efficient. Selank and Semax are, in my experience, the two best multipliers in the category. They’re cheap. They’re safe. They work. They don’t ask much of you in return.
If you’re a writer, a creative, a high-output entrepreneur, an executive making complex decisions every day, or just someone who wants more from their cognitive bandwidth — this is a stack worth experimenting with. Start with Semax alone for two weeks, then add Selank situationally, then build from there.
Bottom line
Semax is the daily focus tool. Selank is the situational calm tool. Together they cover the two failure modes that limit cognitive performance in adults — distractibility and anxiety — without the harshness of stimulants or the dependence risk of benzodiazepines. Five years in, this is the longest-running stack in my personal regimen, and the one I’d hand to a friend with the most confidence.
If you try it, do me a favor: get the foundation right first. Sleep, training, sunlight, food, relationships. The peptides will reward you for the work you already did.