What is semax?
Semax is a short peptide derived from a fragment of ACTH, developed in Russian research and studied for focus, memory, and cognitive support — largely through its effects on BDNF, a growth factor for brain cells.
Our articles explain that mechanism, review the human and animal evidence honestly, and compare semax with selank. Prescribed use runs through a licensed provider who reviews every request. Like selank, most of the evidence comes from Russian research programs, and our articles read it with that context in view.
12 articles on this topic
-
Who Discovered Semax? Its Russian Origins
Igor Ashmarin, Nikolai Myasoedov and a Moscow team developed Semax. Its history runs from modified hormone fragments to Russian registration and U.S. review.
-
Semax Side Effects: What the Safety Data Shows
Mild nasal irritation is documented, but reliable rates for other reactions are missing. The small studies leave important safety questions unanswered.
-
Semax News Update: October 2026
FDA’s advisory panel supported listing Semax for compounding in July. The published list and the limits of the human studies still matter.
-
Semax FDA History: What the July Vote Changed
Semax has never had an FDA-approved U.S. product. A July 2026 advisory vote supported possible 503A listing, but it did not add Semax to the list or approve a drug.
-
Semax Half-Life: The Honest Answer Is Unknown
There is no measured Semax half-life in humans. Rat studies show that intact Semax reaches the brain within minutes and breaks down quickly, but they do not supply a reliable human clock.
-
Semax Selank Nasal Spray: What the Route Changes
A Semax Selank nasal spray puts both peptides in one intranasal liquid, but there is no universal recipe. The route, concentration, pump, and prescription all matter—the Russian studies used nasal drops and sprays, while the blend Promise offers by prescription is an injectable vial.
-
Selank for Anxiety: What the Research Shows
Three small Russian trials, 192 patients, and no placebo arm between them. Here is what that evidence supports, what it doesn't, and where US regulators have landed.
-
Semax for ADHD: What the Evidence Actually Shows
Semax has not been tested in a human ADHD trial. The attention claims come from a small study in healthy volunteers, neurological research, and a biological hypothesis—not evidence that it treats ADHD.
-
What Is Semax Used For? Evidence and Status
Semax is used in Russia for defined neurological and optic-nerve indications. In the United States, interest centers on focus and memory, but the human evidence for those nootropic uses is small and indirect.
-
N-Acetyl Semax Amidate: Claims vs Evidence
N-acetyl Semax amidate caps both ends of Semax, but the stability and potency claims run ahead of the evidence: no published human trial has tested this variant.
-
The Difference Between Semax and Selank
Both peptides are seven amino acids long and share the same Pro-Gly-Pro tail; what separates them is parentage — Semax comes from a fragment of a pituitary hormone, Selank from a fragment of an antibody.
-
Semax Peptide: How It Works in the Brain
How does the Semax peptide work? Most of the mechanism evidence is rodent, the human evidence is intranasal, and the real picture is narrower — and more interesting — than the internet suggests.