GHRP-2 vs Oxytocin
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
GHRP-2
Growth Hormone Releasing Peptide 2 (GHRP-2) is considered one of the most potent GHRPs available. It provides strong GH release with moderate hunger increase compared to GHRP-6.
Full details →Oxytocin
Oxytocin is a natural hormone produced in the hypothalamus, often called the 'love hormone' or 'bonding hormone.' It plays key roles in social bonding, childbirth, lactation, and stress regulation.
Full details →Side-by-Side Comparison
| Aspect | GHRP-2 | Oxytocin |
|---|---|---|
| Dose Range | 100 mcg–300 mcg | 24 mcg–48 mcg |
| Frequency | 3x daily | 1x daily |
| Cycle Length | 8–12 weeks | 2–4 weeks |
| Route | subcutaneous | intranasal |
| Mechanism | Binds to the ghrelin receptor (GHS-R) to stimulate GH release from the pituitary. Also has some direct effects on the hypothalamus. Causes less appetite increase than GHRP-6. | Binds to oxytocin receptors in the brain and peripheral tissues. Promotes social bonding, reduces anxiety and stress response, and has various peripheral effects on smooth muscle contraction. |
| Typical Dosage | Typical dosing: 100-300mcg administered 2-3 times daily. Often stacked with GHRH peptides for enhanced GH release. | Intranasal: 20-40 IU (international units) for social/anxiolytic effects. Clinical uses (labor induction) require IV administration under medical supervision. |
| Administration | Subcutaneous injection on an empty stomach. Can be used at bedtime to enhance natural GH pulse during sleep. | Intranasal spray for behavioral effects. IV only in clinical settings. Sublingual also possible. Best used situationally rather than continuously. |
| Side Effects | Moderate hunger increase, water retention, potential prolactin and cortisol elevation (less than GHRP-6), tingling sensations. | Intranasal: headache, nasal irritation, drowsiness. May cause over-attachment or emotional sensitivity. IV (clinical): uterine hyperstimulation, water retention. |
| Best For |
What They Have in Common
GHRP-2, Oxytocin are both commonly used for:
Key Differences
Unique to GHRP-2:
Unique to Oxytocin:
Which Has Stronger Evidence?
- Sleep Quality: GHRP-2 has stronger research support.
| Goal | GHRP-2 | Oxytocin |
|---|---|---|
| Sleep Quality | medium | low |
Key Studies
GHRP-2
- On the road of dried blood spot sampling for antidoping tests: Detection of GHRP-2 abuse.
Drug testing and analysis, 2021
- Effects of GHRP-2 and Cysteamine Administration on Growth Performance, Somatotropic Axis Hormone and Muscle Protein Deposition in Yaks (Bos grunniens) with Growth Retardation.
PloS one, 2016
- Ghrelin receptor agonist, GHRP-2, produces antinociceptive effects at the supraspinal level via the opioid receptor in mice.
Peptides, 2014
Oxytocin
- Oxytocin promotes socially triggered cataplexy.
Nature neuroscience, 2026
- Oxytocin induces embryonic diapause.
Science advances, 2025
- Oxytocin and the microbiome.
Comprehensive psychoneuroendocrinology, 2023
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