Semax: The Complete Research Guide

What is Semax?

Semax is a synthetic heptapeptide with the amino-acid sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the 4-7 region of the adrenocorticotropic hormone (ACTH) fragment ACTH(4-10), extended with a Pro-Gly-Pro tripeptide that slows enzymatic breakdown. Importantly, Semax is non-corticotropic — it does not stimulate cortisol release the way ACTH does — and in the literature it is most often described as a nootropic and neuroprotective peptide studied in laboratory models.

Semax was developed by researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences, and the majority of the published work on it originates from that research tradition. Throughout this guide the compound is discussed strictly as a research material — it is intended exclusively for laboratory use and is not a medicine.

What the research explores

In laboratory settings, Semax has most often been studied across a handful of interconnected areas:

• Cognition and memory — behavioral paradigms have been used to evaluate nootropic-like effects and learning-related changes in rodents.
• Neuroprotection — preclinical and some clinical research has examined Semax in ischemic and other stress-related brain models.
• Neurotrophic factors — BDNF, NGF, and their receptors have been measured as candidate mechanisms.
• Stress and mood models — chronic-stress paradigms have been used to characterize antistress-like effects in animals.

Purity, testing, and certificates of analysis

In research, the reliability of a result depends on the identity and purity of the material behind it. Every batch of Semax from Peptora is HPLC-verified to 99%+ purity, confirmed by LC-MS identity testing, and screened across a full quality-control panel before release. Each order ships with a lot-specific certificate of analysis (COA) so the material can be matched to its documentation.

Researchers often choose Peptora precisely because this documentation is standard rather than optional. To understand what each figure on a report means, see the guide on the certificate of analysis.

Handling Semax in the laboratory

Semax is supplied as a lyophilized (freeze-dried) powder. Before research use it is reconstituted with bacteriostatic water, which is sold separately. Proper handling preserves peptide integrity and the validity of downstream work:

1. 1Allow the sealed vial to reach room temperature before opening.
2. 2Add bacteriostatic water slowly against the vial wall; swirl gently and do not shake.
3. 3Let the powder dissolve fully before drawing.
4. 4Store the reconstituted solution refrigerated and protected from light.

Full step-by-step protocols live in the reconstitution guide. Following them consistently is one of the simplest ways to keep research reproducible.

Scientific references

Semax has been studied in cell-culture, animal, and some clinical research over roughly two decades. The literature below is provided for educational context, per PubMed, and describes model-system and clinical research on the compound — not the laboratory research product supplied by Peptora.

1. 1Dolotov OV, Karpenko EA, Inozemtseva LS, et al. Semax, an analog of ACTH(4-10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus. Brain Res. 2006;1117(1):54-60. doi:10.1016/j.brainres.2006.07.108.
2. 2Eremin KO, Kudrin VS, Saransaari P, et al. Semax, an ACTH(4-10) analogue with nootropic properties, activates dopaminergic and serotoninergic brain systems in rodents. Neurochem Res. 2005;30(12):1493-1500. doi:10.1007/s11064-005-8826-8.
3. 3Agapova TY, Agniullin YV, Shadrina MI, et al. Neurotrophin gene expression in rat brain under the action of Semax, an analogue of ACTH 4-10. Neurosci Lett. 2007;417(2):201-205. doi:10.1016/j.neulet.2007.02.042.
4. 4Glazova NY, Manchenko DM, Volodina MA, et al. Semax, synthetic ACTH(4-10) analogue, attenuates behavioural and neurochemical alterations following early-life fluvoxamine exposure in white rats. Neuropeptides. 2020;86:102114. doi:10.1016/j.npep.2020.102114.
5. 5Inozemtseva LS, Yatsenko KA, Glazova NY, et al. Antidepressant-like and antistress effects of the ACTH(4-10) synthetic analogs Semax and Melanotan II on male rats in a model of chronic unpredictable stress. Eur J Pharmacol. 2024;984:177068. doi:10.1016/j.ejphar.2024.177068.
6. 6Gusev EI, Martynov MY, Kostenko EV, et al. The efficacy of semax in the treatment of patients at different stages of ischemic stroke. Zh Nevrol Psikhiatr Im S S Korsakova. 2018;118(3 Vyp 2):61-68. doi:10.17116/jnevro20181183261-68.