Semax
aka ACTH (4-10) Pro-Gly-Pro analog
A Russian-developed brain peptide that spikes BDNF — the chemical that helps grow new neurons.
Technically · Russian-developed neuropeptide
In one sentence
A Russian neuro-peptide that spikes BDNF (brain growth factor) in minutes — used for focus, recovery, and stroke rehab.
— Like fertilizer for your neurons. The nootropic community's favorite, the FDA's blind spot.
Half-life
Short (minutes plasma; effects last hours via receptor activation)
Minutes in the blood, but receptor effects last hours. Cycled 1 month on, 1 week off.
Dosing
Daily SubQ (NOT nasal — JD Denham); 1 month on / 1 week off
How often you take a dose
Route
SubQ · Nasal
How it goes into the body
Status
Research
Sold for lab research — not approved for humans
What it is
BDNF is sometimes called "Miracle-Gro for the brain" — it helps neurons grow, connect, and survive. Semax causes a fast BDNF spike within minutes. Russia approved it for stroke recovery, ADHD, and anxiety. Outside Russia, it's a popular "nootropic" peptide.
The full technical answer
A synthetic heptapeptide derived from a fragment of adrenocorticotropic hormone (ACTH). Approved in Russia for stroke recovery, ADHD, and anxiety. Significant BDNF/NGF stimulation. Used off-label for cognitive enhancement and neuroprotection.
How it works
Imagine Miracle-Gro for the soil in your brain. Semax pours a measured dose on, BDNF levels jump within minutes, and neurons get the signal to grow, connect, and survive. It also nudges dopamine and serotonin, which is why people report better focus and mood.
The full technical answer
Increases brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) within minutes. Modulates dopamine, serotonin, and glutamate signaling. Crosses blood-brain barrier even at low doses.
What the research says
Russian clinical trials for stroke and cognitive disorders. Limited Western RCTs. Animal data robust on BDNF elevation and neuroprotection. Used widely in nootropic communities — anecdote-heavy.
Sources: PubMed: Semax
Common dosing ranges
- Range
- 300–600 mcg per dose; some protocols up to 1 mg
- Frequency
- Daily SubQ (NOT nasal — JD Denham); 1 month on / 1 week off
- Duration
- Cyclical only — receptors habituate
Sources: PubMed
How to take it
Practical guidance synthesized from clinical protocols, FDA labels, and clinician interviews. Always cross-check with a prescribing physician.
Best time of day
AM SubQ (per JD Denham — SubQ over nasal for systemic effect). Some users add a midday dose for sustained focus.
With food or fasted
Doesn't matter for SubQ. Nasal route: doesn't matter either.
How long to cycle
1 month on, 1 week off. Receptors habituate with continuous use — cycling preserves response.
When to get off
End each 4-week cycle on schedule. Don't run continuous.
Administration
Side effects
Common
- Generally well-tolerated
- Mild stimulation
Serious / theoretical
- Long-term safety in healthy users not established
- Theoretical: receptor desensitization with continuous use
Sources: PubMed
Notes
Pair with Selank as PM counterpart for calm + focus balance (Jacob Nachinson protocol). Bachmeyer uses it specifically for Alzheimer's/Parkinson's prevention. JD Denham insists on SubQ over nasal for systemic effect.
Further reading & listening
Where the experts go deeper.
Curated from the PeptideFacts expert directory — vetted YouTube channels, podcasts, books, and communities. No anecdote-only or supplier-affiliated picks.
Videos
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