Semax and Selank
Can you take Semax and Selank together, and what is the right way to time them through the day?
Reviewed by the amino101 editorial team. .
Also searched as Semax Selank nasal stack, Russian nootropic stack, Selank and Semax.
Semax is a seven-amino-acid peptide based on a fragment of ACTH, developed in Russia as a nasal drug for stroke recovery and cognitive impairment. People use it for focus, mental stamina, and mood support.
Selank is a seven-amino-acid peptide derived from the immune peptide tuftsin, approved in Russia as a nasal anti-anxiety drug. People use it for calm focus without sedation.
Semax and Selank come from the same lab, the Institute of Molecular Genetics in Moscow, and share the same stabilizing Pro-Gly-Pro tail. Semax is built from an ACTH fragment and leans toward alertness and focus. Selank is built from the immune peptide tuftsin and leans toward anxiety reduction without sedation. People use them together because the two cover opposite ends of the same problem: a mind that needs to be sharper in the morning and quieter in the afternoon. Both are prescription nasal drugs in Russia. Neither is approved anywhere else, and the human evidence for both consists of small Russian trials with no independent replication outside Russia. The rodent data on BDNF, GABA gene expression and stroke recovery is more consistent than the human data.
The combination has never been trialed, but it is used together in Russian clinical practice and is the pairing the compound pages themselves describe. Most searches are about timing, nasal dosage and whether the two cancel each other out. This page covers the morning and afternoon pattern, the nasal route, and the people for whom the stack is the wrong idea. For the compounds head to head, see Semax vs Selank. Everything here is educational.
Why people combine Semax and Selank
Semax raises BDNF and TrkB in the hippocampus and frontal cortex within hours and produces alertness within 15 to 30 minutes of a nasal dose. Selank modulates GABA signaling and slows enkephalin breakdown, which users describe as calm but clear. Dosed in that order, the Semax edge has worn off before the Selank settles things, which is the whole design of the pattern.
Both peptides increase hippocampal BDNF in rat studies. That overlap is one argument for stacking rather than choosing: the focus and the anxiety relief come through different systems, but the plasticity support is common to both.
Semax was built from the ACTH 4-10 fragment specifically because it does not stimulate the adrenal cortex, and rodent studies confirm no corticosterone rise. Selank does not act on the benzodiazepine binding site and has no reported dependence or withdrawal. That is a cleaner profile than a stimulant plus a sedative, which is the comparison people are really making.
Selank will not fix insomnia caused by a late Semax dose; moving the Semax earlier does. Semax will not override the flatness some people get from high dose Selank. Neither is a treatment for a diagnosed anxiety disorder or ADHD, and effects are subtle for a fair share of users, who report nothing at all from one or both.
Semax and Selank dosage and protocol
What appears in research and community protocols for each compound in the stack. Not a prescription.
| Peptide | Dosage | Frequency | Timing and route |
|---|---|---|---|
| Semax | 200 to 300 mcg | once or twice daily | intranasal, split across both nostrils, morning and early afternoon; no doses after mid afternoon |
| Selank | 250 to 500 mcg | once or twice daily, or as needed | intranasal, afternoon or early evening, or 20 to 30 minutes before a stressful event |
Semax courses run 10 to 20 days followed by a break of similar length, since some tolerance to the alerting effect is reported with continuous use. Selank runs 2 to 3 weeks then a break of 1 to 3 weeks, or is simply used as needed on specific days. A common pattern is a 2 week run of both, then 2 weeks off, with Selank kept in reserve for stressful days during the break.
- •Most people start at the low end of each, once daily, and only add a second dose if the first does something.
- •Nasal dosage from Russian drops: 0.1 percent Semax delivers about 50 mcg per drop, and 0.15 percent Selank about 75 mcg per drop.
- •Nasal irritation and dryness build with frequent spraying. Alternating nostrils and keeping sprays refrigerated helps. Ready-made sprays of unknown age may be nearly inert.
- •Caffeine adds to Semax restlessness and insomnia, so people keep it moderate on Semax days.
Work out syringe units for any of these in the dosage calculator.
Can you mix Semax and Selank in one syringe?
Because the two are dosed at different times of day, there is no reason to combine them in one spray bottle, and doing so would force both into every dose. People who use subcutaneous injection instead of nasal sometimes draw both into one syringe for a single morning dose, which is untested but has no known chemical conflict. Vendors sell combined Semax and Selank nasal sprays; they work for people who want one bottle but they throw away the timing that makes the stack sensible. See the reconstitution guide for making a nasal solution from powder.
What to expect, week by week
- Day 1 to 3
Alertness within half an hour of the morning Semax dose, sometimes with restlessness or a mild edge. Selank gives a subtle calm within half an hour or nothing noticeable. Nasal dryness starts.
- Week 1 to 2
Steadier focus and mental stamina from Semax, lower baseline anxiety and easier sleep onset from Selank. This is where most people decide whether the pair works for them.
- Week 2 to 3
Effects plateau and the initial Semax buzz may fade, which is why the course ends here. Some people feel flat at higher Selank doses and do better dropping down.
- After the course
Effects taper over 1 to 2 weeks with no reported withdrawal from either. The break lets tolerance to Semax reset.
Side effects and cautions
- ▲Nasal irritation, dryness and occasional nosebleeds, doubled by using two sprays
- ▲Restlessness or irritability from Semax, mainly at higher doses
- ▲Trouble sleeping when Semax is dosed late in the day
- ▲Fatigue or emotional flatness from Selank at higher doses
- ▲Headache, reported with both
- ▲Hair thinning reported anecdotally by a minority of long-term Semax users
- ▲No noticeable effect at all for a fair share of users
- ■Anyone on SSRIs or other serotonergic drugs. Rodent data show both peptides alter serotonin turnover and no human interaction data exists.
- ■Anyone on benzodiazepines or other sedatives. Selank enhances GABA signaling indirectly, and additive drowsiness is plausible.
- ■Stimulant users, including ADHD medication. Semax adds restlessness and insomnia on top.
- ■Anyone using the stack instead of getting a diagnosed anxiety disorder or attention problem treated. Both compound pages list this as a reason to stop.
Semax and Selank together suit someone who has already tried one of them, found it did something, and has a clear split in their day between work that needs focus and hours that need the anxiety turned down. The timing pattern is the whole value; a combined spray taken twice a day is not really the stack. Someone whose only complaint is anxiety is better off with Selank alone, since Semax can make things worse. Someone whose only complaint is focus or mental stamina is better off with Semax alone, adding Selank only if the restlessness becomes a problem. Both are cheap and short lived, so trying them one at a time costs little and tells you far more than starting with both. The human data is small Russian trials, the effects are subtle for many, and neither belongs in place of treatment for a diagnosed condition. Educational only.
Semax and Selank: frequently asked
Can you take Semax and Selank at the same time?
You can, and combined sprays exist, but the usual pattern is Semax in the morning and Selank in the afternoon or evening. Taking both at once blunts the point: Semax is for drive and Selank for calm, and they are more useful at different hours.
What time of day should you take Semax and Selank?
Reported protocols put Semax in the morning and no later than early afternoon, since late doses disturb sleep, and Selank in the afternoon, early evening, or 20 to 30 minutes before something stressful. Food does not matter for either.
Is Semax or Selank better for anxiety?
Selank. It was registered in Russia as an anxiolytic and the trials compared it to a benzodiazepine. Semax is the focus compound and can make anxiety worse at higher doses. The comparison page goes deeper.
Do Semax and Selank need to be cycled?
Semax does, because tolerance to the alerting effect is reported with continuous daily use. 10 to 20 days on and a similar break is the pattern. Selank runs 2 to 3 weeks or is used as needed. See peptide cycling.
Is nasal or injectable better for the Semax and Selank stack?
Nasal is how both were developed and studied, and it gets the peptides to the brain along olfactory pathways. Injection is an alternative for people who get nasal irritation. There is no head to head human data, so it comes down to tolerance. Nasal solutions degrade faster once opened; see how long peptides last.
What are NA-Semax and NA-Selank?
N-acetyl versions sold as longer lasting and more potent. There is almost no published research on either acetylated form, so the claims are extrapolation. The dosage ranges people use are similar to the standard versions.
Related reading
Two Russian nootropic peptides that get confused constantly. Focus or calm?
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Sources
- Semax, an analog of ACTH(4-10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus. Brain Research, 2006
- Selank administration affects the expression of some genes involved in GABAergic neurotransmission. Frontiers in Pharmacology, 2016