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Blog  ›  Selank: What It Is, What Research Says, and the Evidence

Selank: What It Is, What Research Says, and the Evidence

Jun 11, 2026 4 min Cognitive
TL;DR
Selank is a lab-made peptide based on a natural immune molecule called tuftsin. Animal research suggests it may reduce anxiety, protect against stress-related damage, and support memory. Human trials are still very limited, so it remains a research compound.

What Is Selank?

Selank is a short, synthetic peptide — a tiny chain of amino acids — developed by Russian scientists. It was built by modifying tuftsin, a natural fragment of a protein your immune system already makes. Think of tuftsin as a messenger molecule your body uses to coordinate immune responses. Selank keeps that basic structure but adds a stabilizing tail so it lasts longer in the body.

You'll see it listed as a research compound. That means it is studied in labs and clinical settings, but it is not approved as a medicine in most countries. Always check regulations in your region before any use.

Curious about doses used in published studies? Visit our Selank dosage chart, or plug numbers into the calculator to see how researchers scale amounts by body weight.

What Are Researchers Studying It For?

1. Anxiety and Brain Connectivity

The word most often attached to Selank in the literature is anxiolytic — meaning anxiety-reducing. A 2020 brain-imaging study recruited 52 healthy volunteers and used resting-state fMRI (a scan that maps how brain regions talk to each other at rest). After a single injection, Selank changed communication between the right amygdala (your brain's alarm center) and the temporal cortex. That shift was distinct from both a placebo and from the related peptide Semax.[5]

2. Stress and Inflammation

Chronic stress does more than make you feel bad — it raises levels of inflammatory proteins called cytokines, such as IL-1β, IL-6, and TNF-α. In a rat model of social stress (think prolonged confrontations between males), Selank brought those elevated cytokine levels back toward normal values.[3] Separately, when rats were subjected to repeated electric-foot shocks, stress caused visible damage inside liver cells — swelling, small areas of cell death, and immune-cell invasion. Selank injections before each stress session reduced that damage, with the strongest protective effect seen at 300 µg/kg.[4]

3. Memory and BDNF

BDNF stands for brain-derived neurotrophic factor — essentially a fertilizer for neurons that helps them survive and form new connections. In rats that drank alcohol heavily for 30 weeks, memory and attention declined sharply during withdrawal. Selank (0.3 mg/kg daily for 7 days) prevented those memory deficits. It also stopped alcohol from abnormally spiking BDNF levels in the hippocampus and prefrontal cortex — two regions critical for learning and decision-making.[6] A 2026 orthopedics review noted that neuroactive peptides like Selank enhance BDNF and related pathways important for neuroplasticity — the brain's ability to rewire itself.[2]

4. Opioid Withdrawal

In a 2022 study, rats made dependent on morphine were then given a drug (naloxone) to trigger sudden withdrawal. The withdrawal caused convulsions, drooping eyelids, and posture problems. A single dose of Selank at 0.3 mg/kg cut the overall withdrawal score by nearly 40% and increased pain-sensitivity thresholds ninefold. For comparison, diazepam (a well-known sedative) reduced the score by about 49% at its tested dose. Selank performed similarly but slightly below diazepam overall.[1]

How Strong Is the Evidence?

Here's the honest picture: most Selank research is in animals. The fMRI study is a rare human trial, and it was small.[5] Animal results — even impressive ones — don't always translate to people. Dosing, metabolism, and brain chemistry differ significantly between species.

  • The cytokine findings[3] and liver-protection data[4] are rat studies only.
  • The memory and BDNF work[6] and the withdrawal study[1] are also rat-based.
  • A 2026 review summarizing therapeutic peptides called preclinical results "promising" but flagged a lack of clinical trials as a key gap.[2]

In short: interesting early signals, but far more human research is needed before any conclusions can be drawn about safety or effectiveness in people.

Where to Go Next

If you're researching Selank for scientific or educational purposes, our Selank dosage chart compiles the amounts used across published studies. You can also use the calculator to convert between units or adjust for body weight — handy when comparing protocols across papers.

This article is for educational purposes only and does not constitute medical advice. Selank is a research compound; consult a qualified professional before any use.

Sources

  1. Selank, a Peptide Analog of Tuftsin, Attenuates Aversive Signs of Morphine Withdrawal in Rats. — Bulletin of experimental biology and medicine, 2022. PMID 36322304.
  2. Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions. — Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews, 2026. PMID 41490200.
  3. The Influence of Selank on the Level of Cytokines Under the Conditions of "Social" Stress. — Current reviews in clinical and experimental pharmacology, 2021. PMID 32621722.
  4. Effect of Selank on Morphological Parameters of Rat Liver in Chronic Foot-Shock Stress. — Bulletin of experimental biology and medicine, 2019. PMID 31243679.
  5. Functional Connectomic Approach to Studying Selank and Semax Effects. — Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections, 2020. PMID 32342318.
  6. Selank, Peptide Analogue of Tuftsin, Protects Against Ethanol-Induced Memory Impairment by Regulating of BDNF Content in the Hippocampus and Prefrontal Cortex in Rats. — Bulletin of experimental biology and medicine, 2019. PMID 31625062.
See the dosage chart — Selank
An anxiolytic nootropic peptide derived from tuftsin.
Selank

FAQ

What is Selank made from?
Selank is a synthetic peptide engineered from tuftsin, a natural fragment of the immune protein IgG. Scientists added a stabilizing amino-acid sequence so the molecule breaks down more slowly in the body. It is made in a lab and is not found in food or naturally produced in meaningful amounts.
Has Selank been tested in humans?
Human research is very limited. One notable study used brain fMRI scans in 52 healthy volunteers and found changes in how the amygdala communicates with other brain regions after a single injection. Most other research has been conducted in rats. Large-scale clinical trials confirming safety and effectiveness in people have not yet been published.
What is BDNF and why does it matter for Selank research?
BDNF (brain-derived neurotrophic factor) is a protein that acts like fertilizer for brain cells, helping them grow, survive, and form new connections — a process called neuroplasticity. Selank research suggests it may influence BDNF levels in memory-related brain regions, which is why scientists are interested in its potential effects on learning and cognitive health.
Where can I find dosage information used in Selank studies?
Our dedicated Selank dosage chart at /charts/selank summarizes the amounts researchers used across published studies. You can also use the calculator at /calculator to adjust doses by body weight or convert between measurement units — useful when reading and comparing different research papers.
For research and educational use only. Not medical advice.