PE-22-28 vs Semax.
Quick Verdict
PE-22-28 is a nootropic peptide primarily researched for antidepressant, neuroplasticity, trek-1 channel blockade, fast-acting mood elevation, while Semax is a cognitive peptide studied for mental clarity, focus, neuroprotection. Semax has substantially more indexed research (20 studies) compared to PE-22-28 (2 studies). A key distinction: Semax has FDA approval status.
Side-by-Side Analysis
| Dimension | PE-22-28 | Semax |
|---|---|---|
| Category | Nootropic Peptide | Cognitive Peptide |
| Mechanism | Synthetic hexapeptide fragment derived from the propeptide of sortilin, an endogenous regulator of the TREK-1 potassium channel. | BDNF upregulation, nootropic effects. |
| Half-Life | ~1 hours | ~20 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 Semax Works
Semax Semax is a synthetic ACTH-derived cognitive peptide approved in Russia studied for enhancing memory, focus, and neuroprotection by upregulating brain-derived neurotrophic factor (BDNF).
BDNF upregulation, nootropic effects. Enhances neural plasticity, protects neurons from oxidative stress, and improves cerebral blood circulation.
Key Mechanistic Difference
PE-22-28 operates as a nootropic peptide, while Semax functions as a cognitive peptide — these are fundamentally different pharmacological approaches. PE-22-28 has a significantly longer half-life (~1 hours) compared to Semax (~20 minutes), which impacts dosing frequency and sustained activity.
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
Semax
20 studies- Semax cognitive improvement in humansHuman trial showing cognitive improvement including enhanced attention, memory formation, and learning capacity.…Moderate
- Semax increases BDNF and TrkB expression in hippocampusDolotov et al. demonstrate Semax significantly upregulates BDNF and its receptor TrkB in the rat hippocampus, providing …Preclinical
- Semax high efficacy in acute ischemic strokeClinical-electrophysiologic studies report high efficacy of Semax in acute ischemic stroke patients, with significant ne…Moderate-Strong
Vendor Pricing
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Frequently Asked Questions
Can I take PE-22-28 and Semax together?▼
Yes — PE-22-28 and Semax 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 Semax?▼
PE-22-28 has 2 indexed studies (highest evidence: Preclinical). Semax has 20 indexed studies (highest evidence: Moderate). Semax has a more extensive research base.
Which is better for brain focus — PE-22-28 or Semax?▼
Both are researched for brain focus. PE-22-28 addresses this via antidepressant, neuroplasticity, trek-1 channel blockade, fast-acting mood elevation. Semax approaches it through mental clarity, focus, neuroprotection. The optimal choice depends on your specific research protocol and which mechanism aligns with your objectives.
Is PE-22-28 or Semax FDA-approved?▼
Semax 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.