Selank — The Calm Peptide
Selank is Semax’s calmer cousin. A synthetic version of a natural immune peptide (tuftsin), it’s studied for a steady, anti-anxiety kind of focus — feeling calm and clear at the same time — with links to GABA, serotonin and even immune signaling. Every batch is independently third-party tested for purity and ships with its own certificate of analysis.
- ✓ Credit card / Apple Pay accepted
- ✓ Third-party COA included
- ✓ Free worldwide shipping over $99
Why source Selank from Aeternum Life
Every Selank batch is verified by an independent laboratory.
HPLC-tested identity and purity on every Selank lot.
Sourced and handled to strict, defined specifications.
Discreet, tracked delivery.
What is Selank?
Selank is a synthetic peptide based on tuftsin, a natural immune-signaling peptide, modified for stability. In the nootropic world it’s best known as the “calm” counterpart to Semax — studied for a relaxed, anti-anxiety kind of focus.
Selank research touches the calming neurotransmitter systems (GABA and serotonin), anxiety and mood, plus a tuftsin-linked immune angle. Like Semax, it pairs a short natural fragment with a Pro-Gly-Pro stability tail. Aeternum Life supplies it as ultra-high-purity research material with a batch-specific Certificate of Analysis on every order.
Selank is built on the same design logic as Semax but from a different starting point: tuftsin, a four-residue fragment (Thr-Lys-Pro-Arg) released from the immunoglobulin heavy chain. The same Pro-Gly-Pro stabilising tail is attached, which is why the two compounds are so often discussed together despite acting on different systems. Research on Selank concentrates on GABAergic and serotonergic signalling and on inhibition of enkephalin degradation — the enzymatic breakdown of the body’s own opioid peptides — which is the mechanism most often proposed for its behaviour in anxiety models.
Research directions
Selank is the “calm focus” side of nootropic-peptide research. Here’s the focus.
The headline: Selank is studied for a relaxed, anti-anxiety state.
It’s researched for staying clear and focused while calm — not stimulated.
It’s tied to the calming neurotransmitter systems that govern mood and anxiety.
Mood and stress resilience are recurring Selank research themes.
Because it’s based on tuftsin, Selank also has an immune-signaling research angle.
For research purposes only. These materials are not drugs or dietary supplements and are not intended to diagnose, treat, cure or prevent any disease.
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How Selank is tested
- Certificate of Analysis (COA) for every Selank batch
- HPLC purity & identity
- Mass-spectrometry confirmed
- Batch-tested and fully traceable
Every Selank lot is released only after independent verification, so what you receive matches its stated identity and purity.
Handling & Storage
Guidance for handling Selank as a laboratory research material.
Store lyophilized Selank cold and protected from light, sealed and dry until use.
Handle Selank according to standard laboratory practice for research materials.
Each Selank batch ships with a batch-specific COA for identity and purity.
Selank is supplied strictly for laboratory and research use. Not for human or veterinary consumption; no administration or dosing guidance is provided.
Specifications
- Name
- Selank
- CAS
- 129954-34-3
- Appearance
- White lyophilized powder
- Size
- 5 mg / 10 mg per vial
- Purity
- ≥ 99% (HPLC, see COA)
- Storage
- Store at 2–8°C, protect from light
For research use. Not intended to diagnose, treat, cure or prevent any disease.
Frequently asked questions
How is Selank related to Semax?
They share a design approach, not a mechanism. Both are short natural fragments extended with a Pro-Gly-Pro tail for stability, but Semax derives from ACTH(4-10) and is studied around neurotrophic factors, while Selank derives from tuftsin and is studied around GABAergic signalling and enkephalin metabolism. They are frequently paired in research precisely because those targets do not overlap.
What is Selank studied for?
It’s studied around calm, anti-anxiety focus, mood, and GABA/serotonin systems, with an immune angle from tuftsin. We share these as research directions, not medical claims.
Semax or Selank — what’s the difference?
Semax is the “focus/drive” peptide; Selank is the “calm/anti-anxiety” one. Many researchers study them as a pair. Reconstitution and handling guides are shared in our Telegram community.
Is Selank for human use?
No. Aeternum Life supplies Selank strictly as a research-grade material for laboratory research. It is not sold for human or veterinary consumption.
Is a COA available for Selank?
Yes — every Selank batch ships with a batch-specific Certificate of Analysis covering identity and purity.
About Aeternum Life
Aeternum Life is a Japan-inspired peptide brand built on purity, transparency and rigorous testing — the same standard behind the Selank on this page. Every product is presented by its composition and backed by batch-specific documentation.
Explore the full Aeternum Life range
Selank is one of more than thirty research-grade materials we supply — each one backed by a batch-specific COA and independent testing.
- ✓ Credit card / Apple Pay accepted
- ✓ Third-party COA included
- ✓ Free worldwide shipping over $99