Cholecystokinin-8 vs Nafarelin
Head-to-head comparison of Cholecystokinin-8 (Cholecystokinin (sulfated C-terminal octapeptide, CCK-8)) and Nafarelin (Nafarelin acetate) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Cholecystokinin-8 | Nafarelin |
|---|---|---|
| Category | Endocrine Peptides | Sexual Health |
| Full Name | Cholecystokinin (sulfated C-terminal octapeptide, CCK-8) | Nafarelin acetate |
| Molecular Weight | 1143.2 Da | 1321.47 Da |
| Half-Life | 1-2 min | ~2-4 hours |
| Amino Acids | DY(SO3H)MGWMDF-NH2 | 10 |
| Typical Dose | physiologic low-picomolar-nanomolar range|research-dependent | 200 mcg intranasal twice daily |
| Route | endogenous secretion|research IV/SC | Intranasal |
| Purity | ≥98% | ≥98% |
| Studies Count | 97 | 220 |
| Research Status | Endogenous | Clinical |
Cholecystokinin-8 Benefits
- ✓gallbladder contraction
- ✓pancreatic enzyme release
- ✓satiety signaling
Nafarelin Benefits
- ✓pituitary suppression
- ✓cycle scheduling
- ✓endometriosis-related reproductive care
- ✓controlled hormone modulation
Cholecystokinin-8 Dosing
physiologic secretion|research-dependent
Nafarelin Dosing
200 mcg intranasal twice daily|0.4 mg/day intranasal|protocol-based suppression cycles
Cholecystokinin-8 Side Effects
- ⚠abdominal cramping
- ⚠nausea
- ⚠biliary contraction
Nafarelin Side Effects
- ⚠nasal irritation
- ⚠hot flashes
- ⚠headache
Research Overview
Cholecystokinin-8
CCK-8 is a canonical gut hormone fragment with extensive documentation in digestive physiology and appetite control. Sulfation of the tyrosine residue is important for high-affinity receptor activity.
Nafarelin
Nafarelin has a long history in reproductive medicine, especially for endometriosis and cycle suppression. Studies show it down-regulates the HPG axis after an initial stimulatory flare.
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