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Specimen Atlas of Research Peptides81 plates · MIT
Side-by-side · Research reference

P21vsPancragen

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

AAnimal-MechanisticHUMAN-REVIEWED8/36 cited
BAnimal-StrongHUMAN-REVIEWED23/39 cited
P21
CNTF-Derived Neuropeptide · Animal Model Evidence
CNTFR/gp130Primary receptorGuo 2022
Animal onlyEvidence level
NeurogenesisPrimary effectJia 2020Mottolese 2024
SQ · Site unspecified · Frequency unknown
Pancragen
Bioregulatory Tetrapeptide · Khavinson School
50 μgPrimate doseGoncharova 2014
10 daysTreatment cycleGoncharova 2015
3+ weeksEffect persistenceGoncharova 2014
IM · 10-day cycleGoncharova 2014

01Mechanism of Action

Parameter
P21
Pancragen
Primary target
CNTF receptor alpha (CNTFRα) / LIF receptor (LIFR) / gp130 complex on neural stem cells
Pancreatic acinar and islet cell differentiation pathwaysKhavinson 2013
Pathway
CNTF mimetic → CNTFRα/LIFR/gp130 heterotrimer → JAK/STAT3 signaling → neurogenesis, stem cell proliferation, neuroprotection
Transcription factor activation → Pdx1/Pax6/Pax4/Ptf1a/Foxa2/NKx2.2 upregulation → Cell differentiationKhavinson 2013
Downstream effect
Increased neural stem cell self-renewal, globose basal cell activation (Mash1+ cells), olfactory sensory neuron regeneration, hippocampal neurogenesis, neuroprotection in developmental disorders
Enhanced pancreatic beta-cell function, normalized insulin/C-peptide dynamics, improved glucose clearanceGoncharova 2014
Feedback intact?
Yes — preserves physiological glucose-insulin response
Origin
Small-molecule peptide mimetic derived from full-length ciliary neurotrophic factor (CNTF), designed to retain receptor activation with improved pharmacokineticsMottolese 2024
Synthetic tetrapeptide derived from pancreatic tissue extracts (Khavinson bioregulator methodology)
Antibody development

02Dosage Protocols

Parameter
P21
Pancragen
Human dosing
No established protocol
No clinical trial data available.
Animal models (mice)
Dose and route not specified in abstractsMottolese 2024Jia 2020
In vitro and in vivo studies demonstrate efficacy; precise dosing protocols not disclosed.
Evidence basis
Animal models only
CDKL5 KO mice, methimazole-induced olfactory injury, CNTF-/- knockout models.Mottolese 2024Cox 2026Jia 2020
Non-human primate RCT, in vitro cell cultureGoncharova 2015Khavinson 2013
Duration
Not specified
Route
Presumed subcutaneous or intraperitoneal (animal studies)
IntramuscularGoncharova 2015
Primate dose (rhesus macaque)
50 μg / animal / dayGoncharova 2014
20–25-year-old females, 10-day IM protocol.
Effective concentration (in vitro)
0.05 ng/mLZakutskiĭ 2006
Organotypic tissue culture, both young and aged rat explants.
Frequency
Once daily for 10 daysGoncharova 2014
Treatment cycle
10-day course, effects persist 3+ weeks post-withdrawalGoncharova 2014
Diabetes model
STZ-induced diabetes (rat)
Evaluated via metabolic markers characterizing apoptosis.

04Side Effects & Safety

Parameter
P21
Pancragen
Human safety data
None available
No clinical trials in humans.
No published human trials; clinical use limited to Russian gerontology protocols
Animal tolerability
Well-tolerated in mouse models; no toxicity reported in available abstracts
Theoretical risks
Uncontrolled stem cell proliferation, immune response to peptide, unknown long-term CNS effects
Reported adverse events
None documented in primate studies
Tolerability
Well-tolerated in aged rhesus monkeys (n=9)Goncharova 2015
Absolute Contraindications
P21
  • ·Use in humans not validated
Pancragen
Relative Contraindications
P21
  • ·Active malignancy (theoretical — neurotrophic signaling may affect tumour growth)
  • ·Pregnancy or lactation (no safety data)
Pancragen
  • ·Active pancreatic malignancy (proliferation marker upregulation)

05Administration Protocol

Parameter
P21
Pancragen
1. Human protocol
Not established. No FDA approval, no clinical trial data.
Lyophilised tetrapeptide reconstituted in sterile saline or water per manufacturer protocol. Concentration not specified in literature.
2. Animal research context
In vivo studies used systemic administration (route not specified in abstracts) in mouse models of neurodegeneration, olfactory injury, and CDKL5 deficiency disorder. In vitro studies used primary cell cultures.
Intramuscular injection. Primate studies used daily IM dosing for 10 consecutive days.Goncharova 2015
3. Timing
No specific timing constraints documented. Administered once daily in primate protocols.
4. Cycle structure
10-day treatment course. Restorative effects on pancreatic function persist for at least 3 weeks post-discontinuation.Goncharova 2014