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Focus & Cognition

Selank

Calming nootropic for anxiety and focus · 500 mcg/day · 2–4 weeks

Tuftsin analog · synthetic heptapeptide

Semax's calmer sibling — a short peptide associated with steady, focused calm and reduced anxiety rather than stimulation.

€34.9910 mg · LyophilizedIn stock

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Purity 99%+ HPLC

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Documentation CoA included

For laboratory and in vitro research use only. Not for human or veterinary use, and not for use in diagnostic procedures.

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ClassSynthetic heptapeptide (Tuftsin analog)

Half-lifeMinutes (effects last hours)

Typical routeNasal / SubQ

Cycle2–4 weeks

CategoryFocus & Cognition

Price€34.99

🧾 View Certificate of Analysis

About Selank

Selank is a synthetic peptide based on tuftsin, a naturally occurring immune-signalling fragment. In the focus-and-mood conversation it sits opposite stimulants: it is associated with a calm, anti-anxiety steadiness rather than a push.

PX1 Labs supplies Selank as a 10 mg lyophilized powder verified at 99%+ identity purity by HPLC, with identity confirmed by mass spectrometry. A lot-specific Certificate of Analysis is included with every order.

What it's known for

Selank is best known for calm focus and anxiety. Here is what it is most associated with. (Supplied for laboratory research use only; not an approved medicine outside its Russian use.)

Calm & anxiety

Best known as a non-sedating, anti-anxiety 'calm focus' topic.

Focus without stimulation

Associated with steady focus rather than a stimulant push.

Mood & stress

A popular stress-resilience topic, often paired conceptually with Semax.

What research shows

Most human studies come from Russia and are smaller-scale; large Western trials are limited.

How it works

Selank is a synthetic peptide based on tuftsin, an immune-signalling fragment. It is associated with calming, anti-anxiety signalling (linked in research to GABA and BDNF pathways), which is why it is framed as 'calm focus' rather than stimulation.

What the evidence shows

Most human data comes from Russia, where Selank has been studied and used for anxiety; large Western trials are limited. Promising but, outside Russia, unconfirmed.

An educational summary, not a treatment claim or medical advice.

Side effects & safety

Reference information — not medical adviceSummarised from public research literature. PX1 Labs products are supplied for laboratory research use only; not for human or veterinary use.

Commonly reported

Nasal irritation (intranasal)
Mild drowsiness or fatigue
Transient blood-pressure changes

Cautions & contraindications

Most data is Russian preclinical/early clinical
Additive effects with sedatives/anxiolytics are not well studied
Avoid in pregnancy/breastfeeding

Dosage chart (reference only)

Commonly cited ranges — not a recommendationBeginner / standard / advanced figures collected from public, widely available community references. Provided for reference and comparison only — not a dosing instruction or medical advice. Supplied for laboratory research use only.

Beginner	Standard	Advanced
250 mcg/day	500 mcg/day	750 mcg/day

Frequency	1–2× daily
Timing	Morning
Cycle length	2–4 weeks
Typical route	Nasal / SubQ

Convert any dose to a syringe draw →

Reference protocols

Reference only — not a recommendationThe figures below are commonly cited in public and community references. They are provided for reference and comparison only — not a dosing instruction, recommendation, or medical advice. PX1 Labs products are supplied for laboratory research use only; not for human or veterinary use.

Context	Commonly cited amount	Frequency
Injectable	250–500 mcg	1× daily
Nasal spray	common alternative	—

Reconstitution example: e.g. 10 mg + 2 mL → 5 mg/mL; 250 mcg = 0.05 mL (5 units). Many use a nasal spray instead.

Often short courses of a few weeks, or as-needed around stressful periods.

Work out your own draw in the calculator →

What researchers commonly report — by week

Commonly reported, not guaranteedThese timelines summarise what self-experimenters and widely available community sources describe. Individual results vary widely, many notice nothing on this schedule, and these are not promised outcomes. Reference information only — not medical advice. PX1 Labs products are supplied for laboratory research use only.

Day 1

Often felt same-day — calmer and steadier without sedation.

Week 1–2

Reduced anxious tension reported with regular use.

Ongoing

Used as needed; described as acute.

Specifications

Every PX1 Labs lot is independently verified before dispatch. The figures below describe the product class; exact lot-specific results are documented on the Certificate of Analysis included with your order.

Compound class	Synthetic heptapeptide (Tuftsin analog)
CAS number	129954-34-3
Molecular formula	C₃₃H₅₇N₁₁O₉
Molecular weight	≈ 751.9 g/mol
Identity purity	99%+ (HPLC)
Identity confirmation	Mass spectrometry
Presentation	10 mg lyophilized powder
Physical form	Sterile-filtered, freeze-dried
Storage	2-8°C; -20°C long term
Documentation	Lot-specific Certificate of Analysis

Documentation & quality

Selank passes the same five-stage PX1 quality process applied to every product: HPLC potency analysis, mass-spectrometry identity and purity confirmation, pH and stability validation, sterility and endotoxin (LAL) testing, and QC batch-consistency verification.

A lot-specific Certificate of Analysis ships with every order. The lot number printed on your vial matches the lot ID on the document, so the material on your bench can always be checked against the data on file.

References & research

Selected peer-reviewed literature on Selank (via PubMed), provided for educational context. A reference does not imply a clinical claim for PX1 Labs products.

Selank — questions

How is Selank different from Semax?

Both are short, Russian-developed neuropeptides, but Selank leans calm/anti-anxiety while Semax leans focus/drive. They are often discussed as a pair.

How is Selank supplied?

As a 10 mg lyophilized powder with a lot-specific Certificate of Analysis confirming 99%+ identity purity. Many references use a nasal spray rather than injection.

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Selank

About Selank

What it's known for

Calm & anxiety

Focus without stimulation

Mood & stress

What research shows

Commonly reported

Cautions & contraindications

Specifications

Documentation & quality

References & research

Selank — questions

Often paired with

Semax

NAD+

BPC-157

Retatrutide

Documented peptides, on your bench tomorrow.