Adamax

What it is

Adamax is a modified version of Semax, sold by research vendors as a nootropic compound. The idea behind it is straightforward. Semax is a short peptide that breaks down quickly in the body, so someone took the Semax backbone and bolted on an adamantane group, a rigid cage-shaped hydrocarbon, hoping to make the molecule last longer and cross into the brain more easily. Adamantane is a real and well-understood trick in drug design. It is the same scaffold used in amantadine and memantine.

What surprises most people is where Adamax came from. Semax was developed at the Institute of Molecular Genetics of the Russian Academy of Sciences and has been a registered pharmaceutical in Russia for decades. Adamax was not. It was created and named by Ceretropic, a Mexico-based research chemical company, which was effectively the only reliable source for it until the company shut down permanently in 2018. [6]

That distinction matters more than it might sound. Several sites describing Adamax say it "emerged from Russian nootropic peptide research." That describes its parent compound, not Adamax itself.

The problem: nobody agrees what Adamax is

When we went looking for Adamax's structure, we did not find one answer. We found three, and they describe different molecules.

Two of those three do not survive checking.

The BOC Sciences listing has no adamantane in it. Their catalog gives the formula C₄₄H₆₁N₁₁O₁₃S at 984.10 Da, along with a full IUPAC name and InChI string. We worked the formula out from the sequence. N-acetyl Semax extended by Ala-Gly, as a free acid, comes to exactly C₄₄H₆₁N₁₁O₁₃S at 984.11 Da. That is their number to two decimal places. Their IUPAC name and InChI contain no adamantyl cage either. An adamantane group would add C₁₀H₁₄ and push the molecule to roughly 1117 Da. So the compound listed under the name Adamax, by a supplier that sells it, is by its own paperwork a molecule with no adamantane in it. [7]

The Wikipep formula is chemically impossible. It gives C₄₉H₇₃N₁₁O₁₂, which contains no sulfur. The Semax backbone begins with methionine, and methionine contains a sulfur atom. Any molecule built on Semax has to have sulfur in it. That formula is labeled "approximate," but the issue is not precision. A formula missing an element that the structure requires is not an approximation of the right answer. [8]

The same entry presents a half-life of 4 to 8 hours in a clean table. That figure is not measured. It is extrapolated from how adamantane behaves in other drugs. Its four cited references are three Semax papers and a general review of adamantane chemistry. None of them are about Adamax.

What the published research actually covers

There is no published research on Adamax. We searched PubMed directly and found nothing. Every result for the term is a machine learning optimizer that shares the name, appearing in papers on tumor segmentation and image classification. Searching the structure returns nothing either.

So everything below is research on Semax, the parent compound. It is included because it is the only evidence anyone is actually drawing on when they describe what Adamax supposedly does. It is not evidence about Adamax.

• BDNF and TrkB signaling (Semax) A single dose of Semax produced roughly a 1.4-fold increase in BDNF protein in the rat hippocampus, alongside increased TrkB phosphorylation. BDNF is a protein involved in neuron survival and synaptic plasticity, and this pathway is the one most often invoked to explain Semax's cognitive effects. [1] A companion study found Semax binds specifically in the rat basal forebrain and raises BDNF protein there. [2]
• Ischemic stroke (Semax, human) A Russian clinical study in stroke patients reported that higher plasma BDNF levels in the Semax groups correlated with earlier rehabilitation, and that Semax administration was associated with improvement on the Barthel index. This is one of the few human datasets on the parent compound, published in a Russian-language journal. [3]
• Neurotrophin gene expression over time (Semax) Work tracking NGF and BDNF gene expression in rat hippocampus, frontal cortex, and retina found the response to Semax varies substantially by brain region and by time point after administration. [4]
• Attention and focus (Semax, hypothesis only) A 2007 paper in Medical Hypotheses proposed Semax as a candidate for ADHD, reasoning from animal findings that it can augment psychostimulant effects on dopamine release and stimulate BDNF synthesis. This is worth reading for what it is. Medical Hypotheses publishes ideas for consideration, not experimental results, and no trial has followed up on it. [5]

Research context

The gap between Semax and Adamax is not a difference of degree. Semax has a published literature, a regulatory history in one country, and a known structure. Its evidence base has real limits, mostly single-region research and thin human data, and we say so on its own page. But it exists and you can read it.

Adamax has none of that. It has a plausible design rationale, a defunct originator, no published study, and conflicting structural information across the sources selling it. The claims that circulate about it, longer half-life, better blood-brain barrier crossing, stronger effect at lower doses, all trace back to what adamantane does in other molecules, not to any measurement of this one.

None of that makes Adamax useless or fraudulent. Research compounds are research compounds, and the whole category runs ahead of its literature. But the structural disagreement is a different kind of problem than being under-studied. Two suppliers can both sell you something labeled Adamax and ship you molecules that differ by 130 daltons.

Typical research parameters

If you are comparing prices

Per-milligram pricing assumes you know what a milligram contains. With Adamax you do not, at least not from published information, because the molecular weight is in dispute across suppliers. A vendor selling the 984 Da version and a vendor selling the 1117 Da version are not selling the same product, whatever the label says.

The practical move is to ask any vendor for a certificate of analysis with the mass spectrometry data, and check whether the observed mass matches what they claim to be selling. That is a reasonable thing to ask for and a reasonable thing for a supplier to provide. If they cannot produce it, that tells you something on its own.

Peptide Price Lab publishes research and pricing information for research purposes only. Nothing here is medical advice, and these compounds are not approved for human use.

References

References 1 through 5 are studies of Semax, the parent compound. No study of Adamax has been published.

1. [1] Dolotov 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 Research. 2006;1117(1):54–60. PubMed ↗
2. [2] Dolotov OV, Karpenko EA, Seredenina TS, et al. Semax, an analogue of adrenocorticotropin (4-10), binds specifically and increases levels of brain-derived neurotrophic factor protein in rat basal forebrain. Journal of Neurochemistry. 2006;97 Suppl 1:82–86. PubMed ↗
3. [3] Gusev EI, Martynov MY, Kostenko EV, et al. [The efficacy of semax in the treatment of patients at different stages of ischemic stroke]. Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova. 2018;118(3 Vyp 2):61–68. PubMed ↗
4. [4] Shadrina M, Kolomin T, Agapova T, et al. Comparison of the temporary dynamics of NGF and BDNF gene expression in rat hippocampus, frontal cortex, and retina under Semax action. Journal of Molecular Neuroscience. 2010;41(1):30–35. PubMed ↗
5. [5] Tsai SJ. Semax, an analogue of adrenocorticotropin (4-10), is a potential agent for the treatment of attention-deficit hyperactivity disorder and Rett syndrome. Medical Hypotheses. 2007;68(5):1144–1146. PubMed ↗
6. [6] Origin and naming of Adamax by Ceretropic, and the company's 2018 closure, as documented in nootropic community and vendor sources. No primary corporate record remains publicly available.
7. [7] BOC Sciences. Adamax, catalog number BAT-016517. Listed as C₄₄H₆₁N₁₁O₁₃S, MW 984.10, sequence Ac-MEHFPGPAG. Accessed July 2026. Catalog listing ↗
8. [8] Wikipep. Adamax. Entry revision dated 1 March 2026, giving formula C₄₉H₇₃N₁₁O₁₂ and an estimated 4–8 hour half-life. Accessed July 2026. Encyclopedia entry ↗

Related research notes