Neuropeptide S vs PACAP-38
Head-to-head comparison of Neuropeptide S (Neuropeptide S) and PACAP-38 (Pituitary Adenylate Cyclase-Activating Polypeptide-38 (human PACAP-38)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Neuropeptide S | PACAP-38 |
|---|---|---|
| Category | Cognitive Enhancement | Cognitive Enhancement |
| Full Name | Neuropeptide S | Pituitary Adenylate Cyclase-Activating Polypeptide-38 (human PACAP-38) |
| Molecular Weight | 2203 Da | 4534 Da |
| Half-Life | Minutes to <1 hour | minutes |
| Amino Acids | 20 | 38 aa |
| Typical Dose | Research-only; no validated human dose | 10-100 µg preclinical range |
| Route | Intracerebroventricular/Intranasal | Intranasal |
| Purity | ≥98% | ≥98% |
| Studies Count | 28 | 650 |
| Research Status | Pre-clinical | Pre-clinical |
Neuropeptide S Benefits
- ✓anxiolysis
- ✓stress resilience
- ✓attention support
- ✓arousal modulation
PACAP-38 Benefits
- ✓synaptic plasticity
- ✓BDNF upregulation
- ✓neuroprotection
- ✓memory consolidation
Neuropeptide S Dosing
0.1-1 nmol i.c.v. in animal studies|intranasal research-only exploration|no established human protocol
PACAP-38 Dosing
0.1-1 nmol ICV in rodents|10-100 µg intranasal in preclinical studies|single-dose or short repeated protocols
Neuropeptide S Side Effects
- ⚠sleep disruption
- ⚠headache
- ⚠jitteriness
PACAP-38 Side Effects
- ⚠headache-like effects
- ⚠flushing
- ⚠hypotension
Research Overview
Neuropeptide S
Animal studies suggest NPS can reduce anxiety-like behavior while altering wakefulness and alertness through the NPS receptor system. Human cognitive data are very limited, and it has no approved clinical indication.
PACAP-38
PACAP-38 is one of the most studied endogenous neuropeptides for protecting neurons from ischemic and excitotoxic damage. Preclinical literature also links it to hippocampal plasticity and learning-related signaling, including increased BDNF expression.
Ready to buy?
Find both peptides from our verified, lab-tested vendors with purity certificates and third-party testing.