TL;DR
Semax is a synthetic heptapeptide corresponding to ACTH(4-7) with a C-terminal Pro-Gly-Pro tripeptide extension for enzymatic stability. Developed at the Russian Academy of Medical Sciences, it is registered as a pharmaceutical in Russia and has been the subject of extensive neuropeptide research, particularly examining BDNF and NGF pathway interactions.
Research use only. Semax has not received FDA approval for any human therapeutic indication and is sold strictly for in-vitro laboratory research purposes.
What is Semax?
Semax is a synthetic heptapeptide corresponding to ACTH(4-7) with a C-terminal Pro-Gly-Pro tripeptide extension for enzymatic stability. Developed at the Russian Academy of Medical Sciences, it is registered as a pharmaceutical in Russia and has been the subject of extensive neuropeptide research, particularly examining BDNF and NGF pathway interactions.
Research-grade Semax is supplied as a lyophilized powder with batch-specific Certificate of Analysis verification at ≥99% purity by HPLC.
Molecular Properties
| Property | Value |
|---|---|
| Molecular formula | C₃₇H₅₁N₉O₁₀S |
| Molecular weight | 813.93 g/mol |
| Amino acid count | 7 |
| Purity standard | ≥99% (HPLC verified) |
| Lyophilized storage | -20°C, 24–36 months |
| Reconstitution vehicle | Bacteriostatic water (primary), 0.6% acetic acid or saline (alternative) |
Proposed Mechanisms of Action
Published preclinical research has proposed several complementary mechanisms through which Semax may exert observed effects in laboratory models. No single mechanism has been fully validated in human contexts.
BDNF and NGF upregulation
Published studies consistently report increased brain-derived neurotrophic factor and nerve growth factor expression in cortical and hippocampal tissue following Semax administration.
Dopaminergic and serotonergic modulation
Rodent microdialysis studies describe altered neurotransmitter release patterns in striatum and prefrontal cortex.
Enzyme degradation resistance
The Pro-Gly-Pro extension confers resistance to carboxypeptidases, extending half-life compared with endogenous ACTH fragments.
Research Applications
Cognitive research models
Memory, attention, and learning tasks in rodents examining Semax effects on task performance and neurotrophin expression.
Stroke and ischemia research
MCAO and chemical ischemia models examining infarct size, neurological scores, and BDNF-mediated recovery.
Neuroendocrine research
ACTH-related peptide biology without the steroidogenic activity of full-length ACTH.
Storage and Reconstitution
- Lyophilized at -20°C in original sealed vial; typical shelf life 24–36 months.
- Reconstitution with bacteriostatic water (0.9% benzyl alcohol) is standard. Alternative vehicles include sterile saline or dilute acetic acid depending on experimental requirements.
- Reconstituted solution stored at 2–8°C, used within 7–28 days.
- Avoid repeated freeze-thaw of reconstituted peptide.
- Handling: Follow institutional biosafety protocols; use only in qualified research settings.
Regulatory Considerations
As of early 2026, Semax has no investigational human therapeutic indication. The peptide continues to be available for strictly in-vitro research purposes when properly labeled, sold to qualified researchers, and handled under appropriate institutional biosafety protocols. Researchers should consult current FDA guidance and institutional policies before acquiring any research peptide.
Research Gaps
Despite the substantial published literature on Semax:
- Human pharmacokinetic and pharmacodynamic data remains limited.
- Proposed mechanisms require further validation in human-relevant systems.
- Long-term safety data across species is incomplete.
- Dose-response optimization for specific research applications continues to be an active research question.
- Independent cross-laboratory replication of specific findings is uneven across the literature.
These gaps represent ongoing research opportunities for careful, well-designed preclinical investigation using research-grade material with verified Certificate of Analysis.
Frequently Asked Questions
Is Semax approved for human use?
No. Semax has no investigational therapeutic indication. It is sold exclusively for in-vitro laboratory research in qualified research settings.
What purity standard should research-grade Semax meet?
Quality research-grade material should be ≥99% purity as verified by HPLC with a batch-specific Certificate of Analysis. Aureum Peptides provides COAs with every shipment and maintains a searchable COA portal.
How is Semax typically reconstituted for research?
Bacteriostatic water is the most common reconstitution vehicle. Alternative vehicles (sterile saline, dilute acetic acid) may be used depending on specific experimental protocols.
How long is reconstituted Semax stable?
Once reconstituted, the peptide is generally stored at 2–8°C and used within 7–28 days depending on specific handling and vehicle. Avoid repeated freeze-thaw cycles.
Where can I verify the Certificate of Analysis for my batch?
Aureum Peptides includes a batch-specific COA with every shipment and maintains an online COA portal accessible using the batch number printed on your vial.
References
- Ashmarin IP et al. Neurosci Behav Physiol. 1995.
- Dolotov OV et al. Brain Res. 2006.
- Levitskaya NG et al. 2008.
- Shevchenko KV et al. 2006.
- Glazova NY et al. 2018.
(Reference list abbreviated. Full bibliography with DOIs available on request.)
Shop Research-Grade Semax
Order research-grade Semax from Aureum Peptides: Semax product page
All peptides ship with batch-specific Certificate of Analysis, ≥99% purity verification, and cold-chain logistics. Same-day dispatch on orders placed before 2:00 PM EST.
Disclaimer: This article summarizes published preclinical research for educational purposes to support qualified research activities. The information herein does not constitute research information, therapeutic claims, or recommendations for human use. Semax is not approved by the FDA for any therapeutic indication. Always consult institutional policies and applicable regulations when conducting research with peptides.
Last reviewed: 2026-04-21
Author: Aureum Peptides Scientific Writing Team
Category: Neuropeptide Research
Tags: Semax, ACTH analog, BDNF research, neurotrophin, Russian peptide
