PE-22-28 vs Selank.
Quick Verdict
PE-22-28 is a nootropic peptide primarily researched for antidepressant, neuroplasticity, trek-1 channel blockade, fast-acting mood elevation, while Selank is a anxiolytic peptide studied for anxiety reduction, mental clarity, mood. Selank has substantially more indexed research (20 studies) compared to PE-22-28 (2 studies). A key distinction: Selank has FDA approval status.
Side-by-Side Analysis
| Dimension | PE-22-28 | Selank |
|---|---|---|
| Category | Nootropic Peptide | Anxiolytic Peptide |
| Mechanism | Synthetic hexapeptide fragment derived from the propeptide of sortilin, an endogenous regulator of the TREK-1 potassium channel. | Modulates GABA/serotonin neurotransmitter systems. |
| Half-Life | ~1 hours | ~30 minutes |
| Route | SubQ | Nasal |
| Typical Dose | 500–1000 mcg | 300–300 mcg |
| Frequency | Daily | 7x/wk |
| Evidence Level | Preclinical | Moderate |
| Indexed Studies | 2+ indexed | 20+ indexed |
| FDA Status | Research Only | Approved |
| Lowest Price | — | $29.99 / 10mg via Amino Club |
Mechanism of Action Comparison
How PE-22-28 Works
PE-22-28 PE-22-28 is a spadin-derived peptide that blocks the TREK-1 potassium channel — a key culprit in depression — producing fast-acting antidepressant effects in animal models without typical SSRI side effects.
Synthetic hexapeptide fragment derived from the propeptide of sortilin, an endogenous regulator of the TREK-1 potassium channel. PE-22-28 competitively inhibits TREK-1, a background leak channel whose overactivation is implicated in depression and anxiety. By blocking TREK-1, PE-22-28 increases neuronal excitability in serotonergic circuits and promotes BDNF expression, producing rapid antidepressant effects in rodent models comparable to fluoxetine.
How Selank Works
Selank Selank is a synthetic anxiolytic peptide approved in Russia studied for reducing anxiety and improving mental clarity, with effects comparable to benzodiazepines but without sedation or dependence.
Modulates GABA/serotonin neurotransmitter systems. Enhances immune function by influencing IL-6 and T-helper cell balance. Stabilizes enkephalin levels.
Key Mechanistic Difference
PE-22-28 operates as a nootropic peptide, while Selank functions as a anxiolytic peptide — these are fundamentally different pharmacological approaches.
Research Evidence
PE-22-28
2 studies- Spadin, a sortilin-derived peptide, targeting rodent TREK-1 channels: a new concept in the antidepressant drug designMazella et al. (PLOS Biology): Identifies spadin as a natural TREK-1 blocker with rapid antidepressant activity in roden…Preclinical
- PE-22-28 antidepressant effects and neuroplasticityDjillani et al.: PE-22-28, an optimized spadin analog, demonstrates superior TREK-1 inhibition, enhanced antidepressant …Preclinical
Selank
20 studies- Selank anxiolytic effects in humansClinical trial demonstrates Selank's anxiolytic efficacy in patients with generalized anxiety disorder, comparable to be…Moderate
- Selank anti-anxiety effects comparable to benzodiazepinesStudy confirms Selank provides significant anti-anxiety effects comparable to benzodiazepine treatment, with added cogni…Moderate
- Selank increases BDNF in hippocampus and prefrontal cortexSelank increases BDNF production in the rat hippocampus and prefrontal cortex, preventing ethanol-induced memory impairm…Preclinical
Vendor Pricing
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Frequently Asked Questions
Can I take PE-22-28 and Selank together?▼
Yes — PE-22-28 and Selank are identified as synergistic in interaction databases. They operate through complementary mechanisms and are commonly combined in research protocols.
Which has more research evidence — PE-22-28 or Selank?▼
PE-22-28 has 2 indexed studies (highest evidence: Preclinical). Selank has 20 indexed studies (highest evidence: Moderate). Selank has a more extensive research base.
Which is better for brain focus — PE-22-28 or Selank?▼
Both are researched for brain focus. PE-22-28 addresses this via antidepressant, neuroplasticity, trek-1 channel blockade, fast-acting mood elevation. Selank approaches it through anxiety reduction, mental clarity, mood. The optimal choice depends on your specific research protocol and which mechanism aligns with your objectives.
Is PE-22-28 or Selank FDA-approved?▼
Selank has FDA approval (or is derived from an FDA-approved compound). PE-22-28 is a research compound without FDA approval for human use. FDA status reflects regulatory evaluation — not necessarily superiority for all research applications.
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Research Use Only — Not Medical Advice
This comparison is provided for educational and research purposes only. It does not constitute medical, prescribing, or treatment advice. Clinical data cited here is sourced from published peer-reviewed trials and FDA labels. Consult a qualified healthcare professional before making any decisions about medications or research compounds. PeptiDex is an informational resource and does not sell pharmaceutical products.