The so-called “KGB peptide” and “Limitless peptide,” explained
Semax, the definitive resource
Semax Hub is the place for sourced knowledge and discussion on the peptide known as the “KGB brain spray” and the “Limitless peptide.”
Learn what it is, what the research says and, through discussion, exchange knowledge with like-minded people.
Informational only. Not medical advice. We don't sell Semax.
Learn
Clear, sourced guides on what Semax is, where it came from, and what the research says.
What is Semax?
Heptapeptide MEHFPGP (Semax's seven-letter amino-acid code), an adrenocorticotropic hormone (ACTH) fragment analog, nasal Rx in Russia.
Origin story
From the “KGB peptide” and “Limitless peptide” nicknames to the Institute of Molecular Genetics record.
How Semax works
Brain-derived neurotrophic factor (BDNF) / its receptor TrkB signals in animals, and the open questions that remain.
Evidence map
Russian clinical contexts and Western replication gaps.
Safety & FAQs
Context only. Quality caveats. Not medical advice.
Semax vs Selank
Related peptides, different aims. Keep them straight.
Discuss
Recent and popular threads from the reading room.
Recent
How should we handle the existing “what dose do you use?” habit?
Semax Hub · Sep 29, 2026 · 0 replies
Recent
What claim on this site still feels thinnest to you?
Semax Hub · Sep 29, 2026 · 0 replies
Topic
Dosing & schedules
How people dose Semax, how often, cycles, and nasal technique. Experiences from other users, not medical advice.
Topic
Stacking & combinations
Semax with Selank or other compounds: what people try together, timing, and what they stop using.
Topic
Effects & experiences
What people notice (or don’t): focus, mood, energy, sleep, and how long it lasts for them.
Topic
Sourcing & quality
How people think about quality, compounding, and red flags. Semax Hub does not sell Semax or list shops.
What this site is
- An informational hub with sourced guides.
- A reading-room style discussion space.
- Clear about gaps: if we lack a citation, we say so.
What it isn't
- Not a store, clinic, or dosing guide.
- No carts. No "buy Semax." No medical advice.