Cognitive & Neuro Peptides
Think clearer, focus longer, and protect your brain from decline. These nootropic peptides boost BDNF for neuroplasticity, modulate GABA for calm focus, and promote deep restorative sleep.
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Cognitive & Neuro Peptides (11)
Selank
A nootropic peptide for anxiety relief, focus, and mental clarity.
Semax
A cognitive-enhancing peptide for focus, memory, and neuroprotection.
DSIP
A sleep peptide that enhances natural delta wave sleep without sedation or dependence.
Pinealon
A Khavinson tripeptide (Glu-Asp-Arg / EDR) marketed as a neuroprotective brain peptide; evidence is preclinical cell-culture and rodent only, with no human trials.
Cortagen
A Khavinson cerebral-cortex tetrapeptide (Ala-Glu-Asp-Pro / AEDP) studied in small animal models for nerve regeneration and CNS support; preclinical only.
Dihexa
An angiotensin-IV-derived research peptide studied in animal models for synaptogenesis via the proposed HGF/c-Met pathway; the core mechanism papers were retracted in 2025 and no human trials exist.
Noopept
A dipeptide-derived racetam-class nootropic (omberacetam) with Russian human trial data in cognitive impairment; metabolized to the endogenous peptide cycloprolylglycine, sold in the West as a research chemical.
NSI-189
A neurogenic small molecule that reached a Phase 2 depression trial which failed its primary endpoint; preclinical work reports hippocampal neurogenesis, now sold as a discontinued research chemical.
P-21
A CNTF-derived adamantylated tetrapeptide (P021) studied in rodent Alzheimer's models for neurogenesis and tau reduction; no human trials exist, sold as a research chemical.
Cerebrolysin
A porcine-brain-derived mixture of low-molecular-weight peptides and amino acids given by injection, proposed to mimic neurotrophic factors (BDNF/GDNF/NGF-like); studied for stroke, TBI, and dementia with real but contested evidence, sold as a research chemical in the West.
Adamax
An adamantane-modified analog of Semax (itself an ACTH(4-10)-derived nootropic peptide), marketed for cognition and neuroprotection with claimed longer duration and better blood-brain-barrier penetration; Adamax itself has essentially no dedicated published research, so its proposed BDNF/TrkB mechanism is inherited from the Semax parent. Sold as a research chemical, not FDA-approved.
Related Articles & Guides
results
Adamax Results Timeline: What's Reported
No trial has ever tracked Adamax over time — so what do community sources actually describe week by week? An honest, evidence-graded timeline.
Cerebrolysin Results Timeline: Course by Week
What a reported Cerebrolysin course looks like over time — the first 10-day cycle, repeat courses, and where the trial evidence actually lands.
Cortagen Results: Week-by-Week Timeline
Cortagen has no human efficacy trials — so what drives the reported timelines? Preclinical nerve data and labeled community reports, week by week.
P-21 Timeline: What the Evidence Shows
No human trial sets a P-21 timeline. Here's the gap between rodent chronic-dosing data and community-reported onset, each clearly labeled.
NSI-189 Timeline: What the Evidence Shows
Its Phase 2 depression trial failed the primary endpoint. So what does an NSI-189 timeline actually rest on? Trial data vs anecdote, labeled.
Noopept Results Timeline: Onset Evidence
Russian trials measured Noopept effects over weeks; community users report onset in 15-60 minutes. Here's the gap between the two, each labeled.
dosing
Adamax Dosage: 10mg Vial Protocol Reported
Adamax has no validated human dose — only vendor and community figures. Here's the reported 10mg-vial math, with the evidence gap made explicit.
Cerebrolysin Dosage Guide: Courses & Routes
How Cerebrolysin is dosed: the indication-specific IV trial courses for stroke, TBI, and dementia, plus the community IM figures — and why it's never oral.
Cortagen Dosage Chart: 10-20 Day Course Protocol
A synthetic cortex tetrapeptide with no validated human dose. What research-chem sources report for short courses, plus the extract-vs-synthetic caveat.
P-21 Dosage: What the Community Reports
P-21 has no trial-set dose. See the 500 mcg-1 mg figure community sources actually use, the route mismatch, and the all-rodent evidence behind it.
NSI-189 Dosage: The 40-80 mg/day Trial Figure
NSI-189's 40-80 mg/day comes from a depression trial that failed its primary endpoint. See where the community dose really comes from.
Noopept Dosage: What the Data Shows
People take 10-30 mg/day, but Russian trials used 20 mg. See where each number comes from and why it's oral, not injected.
buying-guide
Buy Adamax: Compare 3 Vendors, From $49.99
Compare 3 Adamax vendors side by side: from $49.99 a vial, best value $5.00/mg. Codes save up to 15%. Vial sizes, COA status, real cost per week.
Buy P-21: Price, COA & Cost Per Week
Only 1 vetted P-21 source right now: $114.95 a vial, $22.99/mg. Codes save up to 10%. COA status and real cost per week.
Buy NSI-189: Price, COA & Cost Per Week
Only 1 vetted NSI-189 source right now: $22.99 a vial, $0.02/mg. Codes save up to 10%. COA status and real cost per week.
Buy Noopept: Price, COA & Cost Per Week
Only 1 vetted Noopept source right now: $19.99 a vial, $0.00/mg. Codes save up to 10%. COA status and real cost per week.
Buy Dihexa: Price, COA & Cost Per Week
Only 1 vetted Dihexa source right now: $69.99 a vial, $0.20/mg. Codes save up to 10%. COA status and real cost per week.
Peptides Under $50/vial: 12 Picks
12 peptides priced under $50/vial with real vendor links — healing, cognitive, sexual, metabolic. $/mg shown for every pick so you can buy smart.
benefits
Adamax Benefits: A Longer-Acting Semax Analog
Adamax is an adamantane-modified Semax analog sold for cognition — but does its own evidence exist? What the family data shows, graded honestly.
Cerebrolysin Benefits: Stroke, TBI & Dementia
A porcine-brain neuropeptide mixture studied for stroke, TBI, and dementia — what the human trials show, and where the Cochrane reviews pushed back.
Cortagen for Nerve Regeneration: Rat Data
The nerve-repair reputation for Cortagen traces to rat studies and a brain-tissue extract, not the synthetic peptide. What the research actually reported.
P-21 Benefits: What the Research Shows
P-21's neurogenesis and tau-reduction claims come entirely from rodent studies — clean of retractions, but zero human data. Sorted by evidence.
NSI-189 Benefits: What the Evidence Shows
NSI-189 reached human trials for depression — then its Phase 2 failed. What's left, what's preclinical, and what's purely anecdotal.
Noopept Benefits: What the Evidence Shows
Noopept is one of the few research nootropics with real human data. What the Russian trials show, what's preclinical, and what's only anecdotal.
side-effects
Cortagen Side Effects: What the Evidence Shows
Its originators claim near-zero side effects, but independent safety data barely exists. What the research shows — and the risks it leaves out.
P-21 Side Effects: The No-Human-Data Reality
P-21 has zero human safety data — every figure is preclinical or anecdotal. The sleep-disruption signal and theoretical cautions, graded by source.
NSI-189 Side Effects: The Trial Safety Record
NSI-189 was well tolerated in trials at ≤12 weeks with no serious adverse events — but its Phase 2 failed and there is no long-term safety data. Graded by source.
Noopept Side Effects: Trials vs Reports
Noopept's side effects, graded by source: what Russian trials documented vs what community users report — headache, blood pressure, and choline depletion.
Dihexa Side Effects: The No-Human-Data Reality
Dihexa has zero human safety data and a retracted mechanism literature. The theoretical cancer concern and anecdotal effects, graded by source.
Semax Side Effects: What Russian Trial Data Shows
Russian clinical data describes clean safety in stroke and ischemia. Community reports add overstimulation and headache. Full breakdown.
reconstitution
Cortagen Reconstitution: 20mg Vial Mixing Chart
Cortagen has no validated human concentration. See how community resources describe mixing the 20mg vial, plus syringe-unit math and storage limits.
P-21 Reconstitution: 5mg Vial Bac Water Math
P-21 ships as a 5mg lyophilized vial with no validated human dose. Here's the bac-water math community sources use for the ~500mcg-1mg subQ range.
Pinealon Reconstitution: 10mg + 1mL Chart
At 10mg/mL, a community-documented 5mg draw is exactly 50 units. Most mixing errors happen at the syringe math. Pinealon dilution chart, storage, and steps.
guides
Buy Cortagen: Price, COA & Cost Per Week
Only 1 vetted Cortagen source right now: $46.95 a vial, $2.35/mg. Codes save up to 10%. COA status and real cost per week.
Buy Pinealon: Compare 3 Vendors, From $49.99
Compare 3 Pinealon vendors side by side: from $49.99 a vial, best value $2.90/mg. Codes save up to 50%. Vial sizes, COA status, real cost per week.
Buy Semax + Selank: Compare 3 Vendors, From $81.99
Compare 3 Semax + Selank vendors side by side: from $81.99 a vial, best value $4.10/mg. Codes save up to 15%. Vial sizes, COA status, real cost per week.
Buy Semax: Compare 5 Vendors, From $40.99
Compare 5 Semax vendors side by side: from $40.99 a vial, best value $2.47/mg. Codes save up to 50%. Vial sizes, COA status, real cost per week.
Buy Selank: Compare 6 Vendors, From $25.95
Compare 6 Selank vendors side by side: from $25.95 a vial, best value $3.46/mg. Codes save up to 50%. Vial sizes, COA status, real cost per week.
Buy DSIP: Compare 5 Vendors, From $24.95
Compare 5 DSIP vendors side by side: from $24.95 a vial, best value $5.80/mg. Codes save up to 50%. Vial sizes, COA status, real cost per week.
articles
Best Peptides for Sleep: 4 Options Ranked
Ranking of the peptides people use for sleep — what each one does, who it suits, and what users actually report.
Best Peptides for Brain Health: 3 Ranked
Ranking of the peptides community sources describe for focus, memory, and sleep — what each does and what users actually report.
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This page is for educational and research purposes only. It does not constitute medical advice. Always consult a qualified healthcare professional before starting any peptide protocol.