FIELD LOG / DOSE CONTEXT
Semax Dosage Research: What Doses the Studies Used
The doses, routes, half-life, and cycling questions as the literature records them — in animals, per kilogram. Research context, not instructions.
Before the numbers
This page describes the Semax doses that appear in published studies — and it is research context, not a how-to. Every quantitative dose in the literature comes from animal experiments and is expressed per kilogram of body weight in rats and mice. There is no validated human dosing schedule outside Russian clinical formulations, so nothing here tells anyone how much to take.
What the studies do tell us: the most common research route is intranasal (through the nose), the doses are small — micrograms per kilogram — and the intact peptide clears from the body in minutes. People often ask about half-life, how long it lasts, reconstitution, and cycling; the literature touches all four, and each is covered plainly below with the studies that inform it. Read these as a map of what researchers measured, not as a protocol.
Doses studied in animals
Across rodent studies the doses cluster low. The neurotrophin gene-expression work used a single 50 microg/kg intranasal dose in rats [2]. The basal-forebrain BDNF binding and protein study used 50 and 250 microg/kg intranasal [1]. The monoaminergic studies in mice used 0.15 mg/kg intraperitoneal [8]. Antidepressant-type stress models in rats have used daily intraperitoneal dosing in the tens-of-nmol/kg range, and the focal-ischemia neuroprotection work used intranasal dosing over several consecutive days [4].
The routes studied are intranasal (the primary clinical and preclinical route), intraperitoneal (common in rodent pharmacology), and systemic injection in some behavioral models [6]. The throughline is that these are animal protocols expressed per kilogram — they do not convert into a human instruction, and this site does not attempt that conversion.
Semax half life
Semax half life is best understood as: very short for the intact molecule. After a 50 microg/kg intranasal dose of radiolabeled Semax in rats, only about 0.093% of the administered radioactivity per gram appeared in brain at 2 minutes — roughly 80% of it still intact Semax, the rest already metabolites — and the peptide undergoes rapid enzymatic degradation [6]. The intact heptapeptide therefore has a very short residence time.
This is why the longer behavioral effects people describe are commonly attributed to the Pro-Gly-Pro (PGP) metabolite rather than to Semax itself still circulating. The stability of Semax acetate against proteolysis has been characterized directly across biological media [15], reinforcing that the parent peptide is degraded quickly. A precise human half-life figure is not established in the published Western literature.
How long does semax last
How long does semax last has two answers that do not match, and the mismatch is the interesting part. Pharmacologically, the intact peptide is gone in minutes [6]. Experientially, the research-use community very commonly reports a noticeable effect lasting only a handful of hours before tapering off — which is why many people redose later in the day.
The bridge between the two is the active PGP metabolite, the leading explanation for effects that outlast the parent molecule. It remains an inference rather than a fully resolved account. So a fair statement is: the molecule itself is short-lived, the reported subjective effect is a few hours, and the gap is attributed to a metabolite — none of which is a dosing instruction.
Semax reconstitution
On Semax reconstitution, the literature is more about stability than about kitchen-table technique, and this page stays on the science. Research-grade Semax is typically supplied lyophilized — freeze-dried to a dry powder that is more stable than a solution — and reconstituted into liquid before use in studies. The relevant published point is degradation: unmodified Semax is rapidly broken down from the N-terminus in blood, the engineered Pro-Gly-Pro tail slows breakdown relative to the bare ACTH(4-7) fragment, and the proteolytic stability of Semax acetate across biological media has been characterized directly [15].
Because Semax sold outside Russia is an unregulated research chemical, the identity, purity, and concentration of any given material are not guaranteed, and sterility and pH of self-prepared solutions are not controlled outside a pharmacy. This site does not give reconstitution instructions; it notes only what the stability literature records.
Semax cycle
On the Semax cycle question, the honest answer is that the published rationale is thin. Some long-term users feel the effect blunts with continuous daily use and take regular breaks, sometimes citing neurotrophic-receptor downregulation as a reason. Eastern European protocols sometimes use short cycling courses.
But the pharmacological basis for cycling — the receptor-downregulation kinetics it would depend on — is not well characterized in the published literature, and formal tolerance, dependence, and withdrawal studies are sparse. So cycling is best described as a community heuristic rather than an evidence-based schedule. There is no validated answer to how much, how often, or for how long, and this page does not supply one.