TB-500 vs PE-22-28
Side-by-side comparison of key properties, dosing, and research.
- Summary
- TB-500 is a synthetic fragment of Thymosin Beta-4, a naturally occurring peptide found in nearly all human and animal cells. It promotes cell migration to injury sites, accelerates tissue regeneration, and reduces chronic inflammation.
- PE-22-28 is a synthetic analog of spadin derived from sortilin, designed to block TREK-1 potassium channels with rapid-onset antidepressant and neurogenic effects. It shows fast-acting depression relief (within 24 hours) and promotes hippocampal neurogenesis.
- Half-Life
- 2–3 hours
- Relatively short; CNS effects may persist due to neurogenic mechanisms
- Admin Route
- SubQ, IM
- SubQ, Intranasal
- Research
- —
- —
- Typical Dose
- 2–2.5 mg
- 200–400 mcg
- Frequency
- Twice weekly
- Once daily
- Key Benefits
- Enhances muscle tissue regeneration
- Accelerates healing of wounds and injuries
- Reduces inflammation and pain
- Improves flexibility and mobility
- Promotes new blood vessel formation
- Supports hair growth and skin health
- May improve cardiac function after injury
- Systemic healing effect — works at distance from injection site
- Rapid-onset antidepressant effects (within 24 hours)
- Promotes hippocampal neurogenesis
- Improves cognitive performance and memory
- Reduces anxiety and depressive behavior
- Novel mechanism — does not act on serotonin/dopamine/GABA receptors directly
- May help treatment-resistant depression
- Neuroprotective effects
- Side Effects
- Injection site discomfort
- Fatigue (rare)
- Headache (rare)
- Generally well tolerated in animal models
- Limited human data available
- Possible mild headache or transient mood changes at initiation
- Injection site reactions (SC)
- Stacks With
- —
- —