In recent years, interest in peptide therapy has grown, particularly in research peptides with nootropic and anxiolytic potential. One of the more discussed molecules is Selank, a synthetic heptapeptide initially developed in Russia as an analog of the endogenous immune peptide tuftsin. Many researchers and enthusiasts seek to buy this peptide online as a research compound, often for preclinical or exploratory studies in models of cognition, stress, or other central nervous system (CNS) processes.
For an introductory overview of routes, mechanisms, and safety notes, start with our Selank nasal spray guide.
It’s often studied for its ability to modulate mood, cognitive processes, stress reactions, and immunological balance. Some call it a new peptide anxiolytic Selank, because of its putative anxiolytic properties without the sedation seen in classic benzodiazepines, making it potentially useful for those with anxiety disorders. Indeed, peptide anxiolytic Selank is often discussed in the same breath as nootropics given its dual behavioral and neural effects.
If you’re still comparing use cases and practical ranges, see the Selank nasal spray dosage guide for weight-based examples and cycling options.
In this article, we first review salient mechanistic and research features of this peptide, and then move to compare three vendors for procuring high-purity versions of it: Core Peptides, Raw Amino, and Limitless Life Nootropics. We discuss their histories, pricing, packaging (e.g. 10 mg, 20 mg vials), shipping, bulk availability, returns, and relevant caveats.
Mechanisms, Effects, and Research Context of Selank
For outcome-level takeaways across anxiety, cognition, and immune modulation, review our Selank benefits explainer.
Before assessing vendor options, it helps to understand why people consider using peptide selank in research.
Pharmacology and Hypothesized Actions
Selank is a synthetic regulatory peptide whose sequence is Thr–Lys–Pro–Arg–Pro–Gly–Pro (TKPRPGP). It was designed as an analog of tuftsin (a naturally occurring tetrapeptide implicated in immune system control).
Some of the key mechanistic proposals include:
- Modulation of GABAergic signaling / GABA_A receptors: Some data suggest that it inhibits or modulates binding of GABA to GABA_A receptors allosterically, thereby influencing inhibitory neurotransmission.
- Inhibition of enkephalin-degrading enzymes: Selank (and related peptides) may suppress plasma enkephalin degradation (enkephalin-degrading enzymes) thereby prolonging endogenous opioid peptide action.
- Regulation of gene expression: Studies have shown that administration affects the expression of some genes involved in neurotransmission, particularly in the frontal cortex (e.g. GABA receptor subunits, transporters, ion channels).
- Elevation of brain-derived neurotrophic factor (BDNF): In animal models, it has been observed to increase hippocampal BDNF levels, which could underlie neuroprotective effects or enhancement of plasticity.
- Immunomodulatory / anti-inflammatory footprint: Because of its tuftsin heritage, Selank may influence cytokines, Th1/Th2 balance, or modulate inflammation and immune cell behavior.
If you’re weighing alternatives with stronger nootropic emphasis, compare mechanisms head-to-head in Selank vs Semax.
Because of these combined neural and immune interactions, some view this peptide not only as a nootropic but also as a modulator of brain–immune cross talk.
Behavioral and Preclinical Findings
A number of experimental studies in animals (primarily rodents) have explored how the synthetic peptide selank may affect anxiety, cognition, and stress:
- In rat models of chronic stress, this peptide enhances anxiolytic outcomes, sometimes synergistically with diazepam, in reducing behavioral indices of anxiety.
- In healthy or non-stressed animals, it may produce more modest effects on anxiety, but often still show a trend toward reduced stress responses.
- In learning and memory studies, research suggests that administration of this peptide can support learning and memory processes under certain conditions, improving acquisition or reducing errors in tasks.
- Some authors have posited that selank appears to reduce the negative effect of stress on cognition, possibly through upregulation of BDNF or modulation of catecholamine or monoamine systems.
In sum, research suggests that it may support cognitive function and mental clarity, reduce anxiety, stabilize mood, and moderate stress responses, with a relatively favorable safety signal in animal models (e.g. no obvious tolerance or dependence in short-term studies).
Some labs explore a complementary protocol that stacks both compounds—see Selank and Semax nasal spray for synergy, dosing cadence, and when to avoid co-administration.
However, it is important to note that while many users consider it safe, human consumption of Selank is generally off-label or in experimental settings, and regulatory status varies by country. Many vendors strictly market it “for research use only.”
Vendor Profiles: Core Peptides, Raw Amino, Limitless Life Nootropics
Below is a comparative review of three providers that currently appear in the marketplace of research peptides and nootropics.
1. Core Peptides
Core Peptides describes itself as a U.S.-based supplier of high-quality peptides for researchers and laboratories. Their products are synthesized and lyophilized in the U.S., with purities typically above 99 %. They carry a catalog of peptides, peptide blends, and customizable orders. They also claim to do “same-business-day shipping” for orders placed before a certain cutoff.
Selank Offering, Pricing & Sizes
On their peptides page, Core Peptides lists 10 mg vials at a sale price of $52.00. They may also list N-Acetyl Selank (10mg) for around $71.00. They do not publicly list a 20 mg vial in the example pages, but their catalog suggests multiple peptides and blends so other sizes might be available under request.
Discounts / Bulk Orders
For the N-Acetyl Selank listing, they show quantity discounts:
- 5–8 units: 5% off (i.e. $67.45 vs $71)
- 9+ units: 10% off (i.e. $63.90)
It is plausible (though not guaranteed) similar discounting applies to standard Selank, or via customer-service negotiation. Their site also occasionally lists “discounts on top peptides and peptide blends.”
Shipping & Turnaround
They offer same-day shipping for orders placed before 1 pm PST Monday–Friday. Orders after that window, on weekends or holidays, ship next business day. They offer priority express (overnight via USPS) as an upgrade.
Free priority USPS shipping is offered for U.S. orders over $200. International shipments reportedly often arrive within about 4 business days.
Returns / Refunds / Policies
Core Peptides has a 30-day refund / return window: returns are accepted for unopened and unused products within 30 days. Refunds are processed once the returned items are received, and the refund is to the original payment method.
Bulk / Wholesale / Custom Orders
Because they offer “customizable orders” and have a broad peptide catalog, it’s likely they entertain bulk or institutional orders. They do not publish a specific bulk-order form for Selank, but the presence of discounts and large catalog suggests some flexibility for volume.
Other Notes / Reputation
Core Peptides is fairly well known in peptide research circles. Their reviews are largely favorable, with many customers praising fast shipping and product consistency. Some reviewers mention that ordering is easy, shipping is fast, and sometimes reconstitution solution is included.
Because peptide storage matters, Core Peptides also publishes guidance on handling peptides (i.e. storing dry, cool, dark, avoiding moisture) to maintain stability.
Company Summary
- Selank 10 mg: ~$52
- Discounts at 5+ and 9+ units
- Same-day shipping before cutoff, free USPS priority >$200
- 30-day returns on unopened products
- Likely bulk / institutional orders accepted via inquiry
Before purchase, confirm your target concentration and spray output using the Selank dosage guide.
2. Raw Amino
Raw Amino positions itself as a specialty synthesizer of ultra-pure peptides, proteins, and amino acid derivatives for research and laboratory use. Their tagline emphasizes research-grade purity and custom synthesis capabilities.
Their reviews mention fast delivery and product quality; others caution about lack of documentation or instructions.
Selank Offering, Pricing & Sizes
At present, Raw Amino sells 10 mg vials of Selank for around $51 per vial. Like Core Peptides, they do offer discounts for bulk orders, including a 5% discount for 5 – 8 vials, and 10% discount for orders of 9 vials or more.
Steeper discounts may be offered for larger orders, but you need to get in touch with the company to find out the exact pricing on that.
Shipping & Turnaround
Raw Amino offers standard USPS priority shipping at a flat rate of $9.25 for most locations in the Continental US. They also offer UPS overnight for around $49. Buyers can expect to receive their packages in 3 – 5 business days, but in most cases, they will likely receive it in 2-3 business days.
Returns / Refunds / Policies
There is no clearly posted returns or refund policy for Raw Amino. That suggests any return or guarantee may be handled case-by-case via support. Given the nature of peptides (sensitive, non-resalable once opened), many peptide vendors limit returns to unopened, intact product.
Bulk / Custom Orders
Raw Amino also offers even steeper discounts for very large orders of 20 or more. That being said, you need to contact them directly to get an accurate quote on pricing.
Other Notes / Caveats
Raw Amino has 3rd party testing done on all of their peptides to ensure that you’re not only getting the real thing, but also that you’re getting quality peptides. You can view their Certificate of Analysis (or COA) directly on their website at the bottom of each peptides’ page.
Company Summary
- High quality Selank at affordable prices
- Standard shipping rates, overnight is available
- 3rd party testing done on all peptides
- Trusted reputation in peptide circles
- Bulk/custom orders available
3. Limitless Life Nootropics (a.k.a. Limitless Biotech)
Limitless Life Nootropics (sometimes branded Limitless Biotech) markets itself as a retail & wholesale biotechnology provider of ultra-pure compounds for research and development purposes. They run a focused shop on nootropic peptides, sprays, and analogs (e.g. Semax, Selank, amidated forms). Learn more about combining Semax and Selank spray for even better results in our comprehensive guide.
The company boasts third-party testing, COAs, and several purity grades (Standard, Standard lyophilized, Premium lyophilized) depending on product. They also provide disclaimers emphasizing research-use only status.
Selank Offering, Pricing & Sizes
Limitless Life currently lists Selank is the following varieties:
- N-Acetyl Selank (injectable): $40.00 – $67.39
- N-Acetyl Selank (nasal spray): $56.09 – $89.99
Pricing depends on the variation of administration (injectable or spray versions), as well as overall size. For example, a bottle of 20 mg lyophilized (99%) Selank spray will cost approximately $54.99.
Changing the dosage size to 30 mg increases the price to $70.39. Alternatively, a 20 mg vial of lyophilized (99%) injectable version will cost approximately $51.99.
If one is looking for the classic version of this peptide (non-acetyl), that may or may not be stocked; their focus seems more on N-acetyl and amidated versions.
Learn more about Selank nasal spray in our comprehensive article.
Discounts / Bulk / Promotion
They frequently list “original price” and “current price” to reflect discounts. The multi-pack pricing represents a discounted per-unit cost versus individual vials.
They may also run periodic site-wide or product-specific discounts, but no static bulk-discount table is publicly visible beyond the pack pricing.
Shipping & Turnaround
Most orders are processed the same day they are placed. They offer optional shipping insurance at 2% of order value for coverage of damage or loss. Limitless also uses amber glass vials to protect substances for customers not receiving overnight shipping or international orders.
Returns / Refunds / Policies
Their shipping and returns page mentions offering returns or addressing issues with shipments, though specifics like 30-day windows or restocking fees are not transparently spelled out. They emphasize safe delivery but do not clearly commit to refunds for open or used vials.
Given typical peptide vendor practice, returns are likely limited to unopened, unused product, and must be arranged with customer support.
Bulk / Wholesale / Institutional Orders
Given their wholesale role, Limitless is well positioned to accept bulk orders, institutional accounts, and large-scale R&D purchases. Their pack-of-10 listings are a clear bulk option.
Other Notes / Reputation
Limitless shows up in reviews and forums as a commonly cited nootropic vendor. Some community users mention them among reputable suppliers.
However, reviews are mixed, with some customers praising product range and others mentioning pricing or support issues.
Company Summary
- Selank (N-Acetyl / amidated) variants via sprays, vials, multi-packs
- Prices: ~$439.90+ for spray, ~$368+ for 10-pack, variable per unit
- Multi-pack / pack discounts exist; occasional promotional pricing
- Same-day processing, optional shipping insurance
- Returns policy less transparent — check with support
- Bulk / wholesale orders likely supported
Buyer Tips & Considerations
- Verify COA and purity. Always request a recent Certificate of Analysis confirming ≥ 98–99 % purity and absence of contaminants.
- Confirm storage and shipping conditions. Peptides are sensitive to moisture, heat, and repeated freeze-thaw cycles.
- Start small / pilot batches. Evaluate quality before large purchases.
- Document vendor policies. Keep written proof of refund and shipping terms.
- Consider analogs carefully. N-acetyl and amidated Selank may have different metabolic stability or receptor affinity than the base compound.
- Check legal status. Ensure compliance with import and research regulations.
- Plan ahead for reorders. Custom synthesis vendors may have longer lead times.
Learn more about the Selank nasal spray dosage to determine if this is the right method of administration for your needs.
Wrapping Up
If your goal is to buy Selank peptide online for research, you now have a solid comparative view of three vendors (Core Peptides, Raw Amino, Limitless Life Nootropics) and how they handle pricing, shipping, returns, and bulk orders.
From a research perspective, this peptide continues to draw interest because it may bridge neural, immune, and stress pathways in ways that support cognitive function and address cognitive disorders, reduce anxiety, modulate stress responses, and influence learning and memory processes. The ability to modulate gene expression, influence GABA signaling, inhibit enkephalin degradation, or upregulate BDNF makes it a multifaceted tool in experimental neuroscience.
However, the results in animal models must always be weighed against translation challenges, regulatory barriers, and the sensitivity of peptide handling. No vendor can replace rigorous experimental controls, but choosing a reliable supplier with transparent policies, good reputation, and robust quality testing is essential to valid results.
For a structured primer covering mechanisms, formats, and FAQs, start here: Selank nasal spray.
If you already know your route and weekly totals, lock in your plan with the Selank dosage reference.