Same Moscow lab. Same Pro-Gly-Pro tail. Two opposite jobs.
Same Moscow institute, same Pro-Gly-Pro trick to keep a short peptide alive, two jobs that do not substitute for each other. Semax is the focus compound — BDNF, dopamine, the one that shows up in writing and long work blocks. Selank is the calm compound — GABA without benzo fog, the one that takes the edge off and leaves the lights on.
Most “vs” pages treat them like two flavors of Russian nootropic. They are not. Run Semax when you wanted Selank and the day gets sharper and louder. Run Selank when you wanted Semax and the brief still sits there. The useful page is the one that holds both in view the whole way down.
Mechanisms, the trials that are actually worth a link, community ranges, how the stack is run, and why a 40mg Semax vial exists when Selank still comes as a 10. Russian hospital products went in the nose. A lyophilized research vial gets mixed and pinned. Different formats, same milligram conversation.
Everest Semax is 10mg and 40mg. Everest Selank is 10mg. Code BRAINFLOW is 10% off.
The BrainFlow Take
Semax moves output. Selank turns the volume down. The stack exists because a lot of people have both problems, and because Semax alone can feel racy if you already run hot. Test them separately first. The Russian file is the reason either peptide is still discussed: Semax as a 1996 prescription for stroke and cognition, Selank as a 2009 anxiolytic with benzo head-to-heads. No US approval. July 2026 PCAC recommended Semax for the 503A list. Selank has not had that vote. Vials sold here are still research vials.
At a Glance
Semax
Focus
ACTH(4-10) + PGP tail. BDNF / TrkB + dopamine. Morning. 300–900 mcg. 10–14 days on.
BDNF · dopamine · morning
Selank
Calm
Tuftsin + PGP tail. GABA allosteric, not a benzo. Any time of day. 300–900 mcg. 10–21 days on.
GABA · no sedation · flexible timing
| Semax | Selank | |
|---|---|---|
| Job | Clean focus, verbal fluency, drive | Anxiety down, brain still on |
| Parent | ACTH fragment | Tuftsin |
| Main lever | BDNF, dopamine, serotonin | GABA, enkephalins |
| Russian Rx | 1996 | 2009 |
| Sedating | No. Late doses wreck sleep | No. Calm without a knockout |
| Community range | 300–900 mcg, AM | 300–900 mcg, as needed |
| Cycle | 10–14 on / 10–14 off | 10–21 on, then a break |
| Best first buy | 10mg, then 40mg if you stay | 10mg |
Same shop · two jobs
Semax 10mg + 40mg · Selank 10mg
Third-party HPLC, COA before checkout. Semax is one of the few 40mg vials on the market, which is how the per-mg price drops. Selank is 10mg. Code BRAINFLOW is 10% off both.
Code BRAINFLOW = 10% off Research use only. Sale prices move.
What Semax Does
Seven amino acids: Met-Glu-His-Phe-Pro-Gly-Pro. Built off ACTH(4-10) so you keep the brain piece and drop the cortisol shove. The PGP tail is why it lasts hours instead of minutes. Russian Rx since March 28, 1996. Stroke wards, optic nerve work, cognitive clinics. Not an FDA drug.
The paper everyone cites is Dolotov 2006, Brain Research. One research dose in rats: hippocampal BDNF protein up 1.4×, BDNF mRNA up 3×, TrkB phosphorylation up 1.6×. Eremin 2005 is the dopamine / serotonin piece that matches the “clean, not caffeinated” logs. Stroke models move a pile of immune and vascular genes (Medvedeva 2014). A Russian cohort of 110 stroke patients on high-dose Semax moved BDNF and Barthel scores faster than controls (Gusev 2017). That dose is a hospital protocol. Do not steal it for a writing day.
What people actually report: easier sentences, less afternoon drag, motivation that does not feel like a stimulant. What they also report: late doses wreck sleep, high mcg gets irritable, a minority feel nothing. If you already run hot, Semax first with no Selank under it is how you find that out.
What Selank Does
Also seven amino acids: Thr-Lys-Pro-Arg-Pro-Gly-Pro. Built off tuftsin, the immune peptide from Tufts, then given the same PGP tail. Russian approval in 2009 for generalized anxiety and neurasthenia. Same institute as Semax. Different brief: take the edge off without turning the lights out.
Benzos force GABA-A receptors open. That is why they work and why they ruin people. Selank is a positive allosteric modulator — it turns your own GABA signal up instead of kicking the door. Volkova 2016, Frontiers in Pharmacology watched 45 genes move in an hour, with a 0.86 correlation to GABA pathways. It also slows the enzymes that chew enkephalins, which is why the mood piece is not just “less anxious.”
The trials that matter are the head-to-heads. 62 GAD patients vs medazepam: anxiety drop matched the benzo, Selank group was not sedated and picked up energy instead of losing it. Vs phenazepam: same anxiety relief, effects hung around a week after the last dose, no withdrawal theater. Selank plus a benzo cut the benzo side effects. That last one is why taper conversations keep coming back to this molecule. It is not a license to self-taper. It is why the file is thicker than a forum rumor.
What people report: background worry drops, social rooms get easier, sleep improves because the 1 a.m. loop gets quieter — not because Selank knocks you out. Side effects are mostly pin-site stuff and the occasional headache. Autoimmune conditions are the one group that should not treat the tuftsin origin as trivia.
Where They Split
Long focus, verbal fluency, a brief that will not move. Anxiety is not what is wrecking the day.
Background worry, a hard room, a week that will not come down. You still need the brain on.
Semax in the morning block, Selank when the edge shows up. Learn each vial before you combine them.
Semax first is a mistake if you already live in fight-or-flight. The dopaminergic bump that feels like drive in a calm person feels like static in an anxious one. Selank first is a mistake if your only complaint is that you cannot finish the brief. It will not replace a focus peptide.
NASA and N-Acetyl versions are a different product than the Russian hospital molecule. Everest and the papers that built this reputation are base Semax and base Selank. Anecdotes say the capped versions last longer. There is no head-to-head trial. Do not buy NASA because a blend spray told you it was “2–5× stronger.”
The Stack
Community pattern that actually holds: Semax in the morning. Selank later, or on the days the room is loud. Three to five days on each alone before you combine them. If something feels off you want to know which vial did it.
Spacing them a few hours apart is not sacred. It is diagnostics. Once you know your response, same-morning is common. Semax plus modafinil still gets the “I got sleepy” reports. Semax plus a prescribed stimulant can amplify anxiety — that is a clinician conversation, not a stack tip. Selank plus caffeine is usually uneventful. Semax plus a full pot of coffee is how the racy logs get written.
What People Actually Take
Lyophilized powder, bacteriostatic water, U-100 insulin syringe, subcutaneous into abdominal fat. The published Russian products were nasal. That is how Dolotov and the GAD trials dosed. It is not a rule that a research vial has to go up your nose.
| Semax | Selank | |
|---|---|---|
| Community range | 300–900 mcg, morning | 300–900 mcg, flexible |
| Where most people live | 300–600 mcg | 300–600 mcg |
| High end | 900 mcg | 900 mcg |
| Hospital / clinic charts | Stroke protocols went to milligrams | ~450 mcg/day in some 0.15% charts |
| Cycle | 10–14 on / 10–14 off | 10–21 on, then off |
| Timing | Before mid-afternoon | Whenever the edge is |
Same mix math on a 10mg vial with 2.0 mL BAC: 5 mg/mL. 300 mcg is 6 units. 600 mcg is 12 units. 900 mcg is 18 units. A Semax 40mg vial with the same 2.0 mL is 20 mg/mL — 3 units is 600 mcg, which is the clean mark. Do not copy a 10mg chart onto a 40mg vial.
Semax 10mg
$29.99
~$3.00 / mg
~16 mornings at 600 mcg
First course
Semax 40mg
$63.74
~$1.59 / mg
~66 mornings at 600 mcg
Almost nobody else stocks this size
Selank 10mg
$29.99
~$3.00 / mg · the size most shops sell · same 2.0 mL mix as a Semax 10
No 40mg Selank on most menus, including Everest
40mg Semax is the value play
Do not buy two tiny Semax vials
Selank 10mg covers a course. Semax 10mg covers a look. The 40mg Semax is how you stop paying $4–5/mg. Code BRAINFLOW is 10% off Semax and Selank.
Semax 10mg + 40mg → Selank 10mg →Legal Status in 2026
Neither is FDA-approved. Both are sold here as research peptides. Russia treats them as drugs.
July 24, 2026: PCAC voted 8–5–1 to recommend Semax free base and acetate for the 503A Bulks List. That is a committee recommendation. FDA has not issued the rule. Selank came off Category 2 earlier in 2026 and has not had its own vote. Do not read a Semax recommendation as “my pharmacy can make both tomorrow.”
Not named on the 2026 WADA list. Unapproved substances can still sit under S0. Tested athletes should treat both as high-risk.
Where to Buy
Demand a COA you can see before checkout, milligrams on the vial, and base Semax / base Selank if you want the molecule the papers used. Blend nasal sprays of N-Acetyl-this and Amidate-that are a different product than the Russian file.
Everest Semax is 10mg from $29.99 and 40mg from $63.74. Everest Selank is 10mg at $29.99. Third-party HPLC, COA posted. Code BRAINFLOW takes 10% off either page.
Two pages · one code
Semax for the work. Selank for the edge.
Grab the Semax 40mg if you already know this is more than a sample week. Selank 10mg covers the calm side. Code BRAINFLOW is 10% off.
Shop Semax → Shop Selank →FAQ
Can I just run both from day one?
You can. You just will not know which vial gave you the headache. A few days on each first is how people keep the notes honest.
Is Selank a benzo replacement?
Head-to-head Russian data vs medazepam and phenazepam is the strongest anxiolytic file in this aisle. It is not an FDA-approved substitute. Do not self-taper a prescription off a blog post.
Will Semax fix ADHD?
No trial. Mechanism is in the neighborhood. Plenty of logs. That is not a diagnosis and it is not Adderall.
Why is Semax 40mg and Selank only 10mg?
Most shops sell both as 10s. A 40mg Semax is rare and that is where cost per milligram actually breaks. Selank courses fit a 10.
Do I use the nose or a pin?
Studies: nose. Lyophilized research vial: people inject subcutaneous. Oral is still a waste.
NASA / N-Acetyl — worth it?
Different molecule than the hospital evidence. Maybe longer lasting. No head-to-head. Base first.
Bottom Line
Semax if the work is stuck. Selank if the nervous system is stuck. Both, often, because those two complaints travel together. The Russian file is why these names outlasted a decade of nootropic-peptide launches. The US file is still research-only.
Everest Semax 10mg + 40mg · Everest Selank 10mg · code BRAINFLOW saves 10%
Semax and Selank are sold as research peptides for laboratory use only. Not FDA-approved in the United States. Educational, not medical advice. Consult a clinician before any protocol.
Affiliate links to Everest Peptides. BrainFlow may earn a commission at no extra cost to you.
Last updated: September 2026
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