P21 Injectable
P21 5 mg contains the CNTF-derived tetrapeptide P021 (Ac-DGGL(A)G-NH2), a synthetic neurotrophic compound designed from the active region of ciliary neurotrophic factor. The peptide incorporates an adamantane modification at the C-terminus, which confers resistance to exopeptidase degradation and enables oral bioavailability and blood-brain barrier penetration in rodent models.
In research contexts, P21 is studied for its pro-neurogenic and pro-cognitive effects. Preclinical studies in transgenic Alzheimer's mouse models have demonstrated that chronic oral treatment with P021 rescues dendritic and synaptic deficits, boosts hippocampal neurogenesis, reduces tau hyperphosphorylation, and reverses cognitive impairment. The proposed mechanism involves upregulation of brain-derived neurotrophic factor (BDNF), which activates TrkB signaling and decreases GSK-3β activity.
In bodybuilding and nootropic contexts, P21 is referenced anecdotally for cognitive support and neuroprotection, particularly during periods of caloric deficit or intense training. However, no human clinical trials have evaluated P21 for any indication, and the safety profile in humans is completely uncharacterized. Such use falls outside any approved indication.
Research Properties of P21 5 mg
- CNTF-derived tetrapeptide with adamantane modification for stability
- Orally bioavailable and brain-penetrant in rodent models
- Investigated for neurogenesis and synaptic plasticity enhancement
- Demonstrated cognitive rescue in Alzheimer's mouse models
- 5 mg per vial for research applications
CNTF-Derived Neurotrophic Peptide
P21 (also published as P021) was designed by researchers at the Iqbal lab in New York to capture the neurotrophic effects of ciliary neurotrophic factor (CNTF) in a small, druggable molecule. Full-length CNTF cannot cross the blood-brain barrier, has a short half-life, and causes severe side effects including cachexia.
P21 is a four-amino-acid fragment (DGGL) corresponding to a narrow active region of CNTF, with an adamantane group added at the C-terminus to increase stability and blood-brain barrier permeability. Solution NMR studies and molecular characterization confirm the adamantane modification does not disrupt the peptide's receptor-binding conformation.
The proposed mechanism of action involves activation of the CNTF receptor complex (CNTFRα/gp130/LIFRβ), leading to JAK/STAT signaling and downstream upregulation of BDNF expression. Increased BDNF then activates TrkB receptors, which promotes hippocampal neurogenesis, dendritic arborization, and synaptic plasticity.
Defining Characteristic
Orally Active Neurotrophic Signaling
P21's defining research characteristic is its oral bioavailability and brain penetration, achieved through the adamantane modification. This distinguishes it from full-length CNTF, which requires invasive administration and causes significant side effects.
P21 5 mg vs Other Dragon Pharma Preparations
Dragon Pharma offers several peptides referenced in cognitive and neurological research contexts. Semax is a synthetic ACTH fragment studied for BDNF modulation and cognitive enhancement. Selank is a tuftsin analogue investigated for anxiolytic and nootropic effects. DIHEXA is a hepatocyte growth factor derivative studied for synaptogenesis. P21's mechanism of CNTF receptor activation and downstream BDNF upregulation is distinct from these compounds.
Typical Dosage Ranges
Common reference ranges for P21 are not well characterized in publicly available research literature. No validated human dosing protocol exists. Preclinical rodent studies used oral administration in feed or subcutaneous implants, with doses in the nmol/day range. Community protocols reference 250 mcg to 1 mg daily subcutaneously or 200-400 mcg intranasally, but these are anecdotal extrapolations without human safety or efficacy data.
| Use Case |
Common Reference Range |
Frequency |
| Preclinical (mouse studies) |
25 nmol/day (implant) |
Continuous for 35 days |
| Preclinical (oral, Alzheimer's model) |
Chronic diet incorporation |
12 months |
| Community protocol (unverified) |
250 mcg–1 mg |
Daily, 4–12 week cycles |
Reconstitution & Handling
P21 5 mg is supplied as a lyophilized powder requiring reconstitution. Bacteriostatic Water is commonly referenced for reconstituting research peptides. A 5 mg vial reconstituted with 2 mL yields a concentration of 2.5 mg/mL. Add solvent slowly along the vial wall and swirl gently. Do not shake. Store reconstituted solution at 2–8°C and protect from light.
Stacking & Research Considerations
In community research contexts, P21 is sometimes referenced alongside other nootropic peptides such as Semax or Selank for complementary cognitive effects. However, no controlled studies have examined the safety or efficacy of these combinations. P21's mechanism involves BDNF upregulation and neurotrophic signaling, which may interact with other compounds affecting neuroplasticity.
Important
Individual Response Varies
The information above is for educational reference and does not constitute medical advice. P21 has not been evaluated by the FDA for safety or efficacy in humans.
Important Safety Information
P21 has never been tested in human clinical trials. No Phase 1 safety data, no human pharmacokinetic studies, and no long-term safety follow-up exist. All available data comes from in vitro experiments and rodent models, including chronic oral dosing for up to 12 months in mice with no reported adverse effects.
Important
Non-Medical Use
Non-medical use of P21 falls outside any approved indication. No population exists for whom use of this compound is supported by evidence, and gray-market products are not manufactured under pharmaceutical standards.
Potential Adverse Effects
Based on preclinical data and manufacturer information, possible side effects include injection site reactions (mild redness, discomfort), headache at course start, and transient fatigue during initial adaptation. The full safety profile in humans has not been established. Theoretical concerns include unintended effects on neurotrophic signaling or BDNF-mediated pathways, though no such effects have been observed in animal studies.
Conditions Requiring Medical Evaluation
Precautionary contraindications include pregnancy and lactation, active oncological conditions, severe neurological diseases in acute phase, and individual intolerance to formula components. No formal contraindication list exists for human use because no approved indication exists.
Monitoring Considerations
No standardized monitoring protocol exists for P21. It does not suppress endogenous hormones, shift lipids, stress the liver, or affect CBC or metabolic panels in preclinical chronic-dosing studies. Laboratory testing of the product itself is separate from clinical monitoring of the individual.
Product Care
Storage & Handling
Store lyophilized powder at -20°C for long-term storage, protected from light and moisture. After reconstitution, store at 2–8°C and use within a reasonable timeframe. Do not freeze reconstituted solution. Discard if solution becomes cloudy or develops particulate matter.
Keep all research peptides and injectable products out of the reach of children.
Further Safety Information
USA Domestic 3–5 business days
International 10–15 business days
Order Processing 24–48 business hours
Tracking Provided after dispatch
Direct Supply
Discreet Delivery & Original Packaging
The outer shipping package remains discreet, with no external product details. Products are supplied through the official Dragon Pharma distribution chain.
What to Expect
- Orders are processed after payment confirmation
- USA Domestic shipping is typically faster when local stock is available
- International orders include tracking, though update frequency may vary by destination
- Multiple warehouses may result in separate shipments when applicable
Authenticity Verification
To verify your P21 5 mg product, use the security code on the vial label and cross-check it on the official Dragon Pharma site. Original packaging and batch documentation help reinforce product legitimacy.
For complete delivery details, tracking policy, and reshipment terms, please see our Shipping Info page.
Recommended Conditions
Store lyophilized powder at -20°C for long-term storage, protected from light and moisture. The unopened vial should be kept under conditions that preserve the peptide's structural integrity until reconstitution.
Once reconstituted, P21 solution should be stored at 2–8°C and used within a reasonable timeframe. Do not freeze reconstituted solution. Discard if solution becomes cloudy or develops particulate matter.
Keep out of reach of children. Follow proper handling practices for research peptides and use appropriate sterile technique during reconstitution.
Quick Reference
Do & Don't
- Do store lyophilized powder at -20°C for long-term storage
- Do protect from light and moisture
- Do use reconstituted solution within a reasonable timeframe
- Don't freeze reconstituted solution
- Don't expose to excessive heat
- Don't use if powder appears discolored
What is P21 5 mg used for?
P21 5 mg is a research peptide supplied as a lyophilized powder. It contains the CNTF-derived neurotrophic tetrapeptide P021, which is investigated for pro-neurogenic and pro-cognitive effects in preclinical models. There is no FDA-approved human indication for P21.
How often should P21 5 mg be administered?
Common reference ranges for P21 are not well characterized in publicly available research literature. No validated human dosing protocol exists. Preclinical rodent studies used oral or implant-based administration, while community protocols reference 250 mcg–1 mg daily, but these are anecdotal extrapolations without human safety data.
Does P21 5 mg require PCT?
P21 is not an anabolic steroid and does not suppress endogenous testosterone production. Post-cycle therapy designed for steroid cycles is not applicable. Its mechanism involves neurotrophic signaling and BDNF upregulation, not hormonal pathways.
What does P21 do?
P21 activates the CNTF receptor complex, leading to JAK/STAT signaling and downstream upregulation of BDNF expression. Increased BDNF then promotes hippocampal neurogenesis, dendritic arborization, and synaptic plasticity. Preclinical studies have demonstrated cognitive rescue and reduction of tau pathology in Alzheimer's mouse models.
How long does P21 take to work?
No established onset timeline exists for P21 in humans because no clinical trials have been completed. Its mechanism is cumulative, involving neurogenesis and synaptic remodeling, which would theoretically develop over weeks. Preclinical studies assessed effects after 30 days or longer of continuous treatment.
Is P21 the best nootropic peptide?
No single nootropic peptide is universally superior. P21 has not been tested in humans, and its effects have only been demonstrated in animal models. Other compounds like Semax have more extensive human research data.
What is the difference between P21 and Semax?
Semax is a synthetic ACTH(4-10) fragment studied for BDNF modulation and cognitive effects. P21 is a CNTF-derived tetrapeptide that activates the CNTF receptor complex and upregulates BDNF through JAK/STAT signaling. Their mechanisms and origins are different.
What is the difference between P21 and DIHEXA?
DIHEXA is a hepatocyte growth factor derivative studied for synaptogenesis through HGF/c-Met signaling. P21 operates through the CNTF receptor and BDNF pathway. These compounds have distinct mechanisms and research profiles.
Is 5 mg of P21 a lot?
5 mg is the total labeled content of the P21 5 mg vial. Because no standardized human dosage exists for this research peptide, the milligram amount cannot be classified as high or low relative to established protocols. Preclinical doses are in the nmol/day range.
What strength is P21 5 mg?
P21 5 mg by Dragon Pharma contains 5 mg of P21 per vial as a lyophilized powder. The vial size is 2 mL. This is a research presentation.
Can P21 be stacked with other peptides?
There is no established research on combining P21 with other peptides. In community contexts, it is sometimes referenced alongside Semax or Selank for cognitive effects, but no controlled studies support these combinations.
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