Triptorelin vs P21
Side-by-side comparison of key properties, dosing, and research.
Sexual Health & Libido
TriptorelinCognitive EnhancementAnti-Aging & Longevity
P21- Summary
- Triptorelin is a synthetic decapeptide analog of gonadotropin-releasing hormone (GnRH) with 100x the potency of native GnRH. An FDA-approved drug (Trelstar) for prostate cancer and precocious puberty, it is also used in post-cycle therapy (PCT) to rapidly restart the hypothalamic-pituitary-gonadal (HPG) axis after anabolic steroid suppression.
- 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
- Depot forms: weeks to months; aqueous: 6-8 hours
- Not well characterized; likely short, but neurogenic effects persist long after administration
- Admin Route
- SubQ, IM
- SubQ, Intranasal
- Research
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- Typical Dose
- 100 mcg
- 100–500 mcg
- Frequency
- Single injection
- Once daily
- Key Benefits
- Rapid HPG axis restart after steroid use
- Single-injection PCT protocol possible
- Massively elevates LH and FSH via flare effect
- Restores endogenous testosterone faster than traditional PCT
- FDA-approved for established medical uses
- 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
- Initial testosterone flare (intended)
- Injection site reactions
- Hot flashes (with chronic use)
- Decreased libido (chronic dosing)
- Generally well tolerated in animal studies
- Limited human clinical data
- Injection site reactions
- Potential mild fatigue at initiation
- Stacks With
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