ARA-290 vs P21
Side-by-side comparison of key properties, dosing, and research.
- Summary
- ARA-290 is a synthetic 11-amino acid peptide derived from the helix B region of erythropoietin (EPO). Unlike EPO, it selectively activates the innate repair receptor (IRR) without stimulating hematopoiesis, providing tissue protection, anti-inflammation, and neuropathy relief.
- P21 is a synthetic peptide derived from CNTF (ciliary neurotrophic factor) that promotes hippocampal neurogenesis, enhances memory and spatial learning, and may reduce amyloid-beta pathology. It is used as a neurogenic and cognitive enhancer with potential anti-Alzheimer's applications.
- Half-Life
- ~2–4 hours (SC administration)
- Not well characterized; likely short, but neurogenic effects persist long after administration
- Admin Route
- SubQ
- SubQ, Intranasal
- Research
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- Typical Dose
- 4 mg (fixed dose)
- 100–500 mcg
- Frequency
- Once daily
- Once daily
- Key Benefits
- Reduces neuropathic pain from small fiber neuropathy
- Anti-inflammatory without immune suppression
- Tissue protection after ischemia/reperfusion injury
- Promotes nerve fiber regeneration
- Improves symptoms of sarcoidosis-associated neuropathy
- May reduce insulin resistance and improve metabolic health
- Shown to improve autonomic neuropathy symptoms
- Promotes hippocampal neurogenesis
- Enhances spatial memory and learning
- Increases BDNF expression
- Reduces amyloid-beta plaque formation (animal models)
- Anti-tau pathology potential
- Cognitive enhancement without stimulant effects
- Potential therapeutic for Alzheimer's and cognitive aging
- Side Effects
- Injection site reactions
- Mild fatigue at initiation
- Transient warm sensation post-injection
- Rare: mild headache
- Generally well tolerated in animal studies
- Limited human clinical data
- Injection site reactions
- Potential mild fatigue at initiation
- Stacks With
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