HGH Fragment 176-191 vs Melanotan II
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
HGH Fragment 176-191
HGH Fragment 176-191 is the fat-reducing portion of the growth hormone molecule. Unlike AOD-9604 (which has an additional tyrosine), this is the exact fragment of HGH responsible for lipolytic effects.
Full details →Melanotan II
Melanotan II is a synthetic peptide analog of α-MSH with broader receptor activity than Melanotan I. It produces tanning effects and has notable effects on sexual function and appetite suppression.
Full details →Side-by-Side Comparison
| Aspect | HGH Fragment 176-191 | Melanotan II |
|---|---|---|
| Dose Range | 250 mcg–500 mcg | 250 mcg–1 mg |
| Frequency | 2x daily | 1x daily |
| Cycle Length | 12–16 weeks | 1–2 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Mimics the lipolytic region of growth hormone, stimulating fat breakdown and inhibiting lipogenesis without affecting blood sugar or promoting growth. Works independently of GH receptors. | Non-selective melanocortin receptor agonist affecting MC1R (tanning), MC3R and MC4R (sexual function and appetite). This broader activity explains its multiple effects beyond tanning. |
| Typical Dosage | Typical dosing: 250-500mcg daily, often split into 2-3 doses. Usually administered on empty stomach, often with fasted cardio. | Typical protocols: 0.25-0.5mg daily during loading phase for 1-2 weeks, then 0.5-1mg before UV exposure for maintenance. Start low to assess tolerance. |
| Administration | Subcutaneous injection. Best results when used fasted and combined with exercise. Avoid eating for 30 minutes post-injection. | Subcutaneous injection. Usually combined with UV exposure for tanning effects. Nasal spray formulations exist but have lower bioavailability. |
| Side Effects | Generally well-tolerated. May cause injection site irritation, temporary lethargy, or headache. Does not affect blood glucose significantly. | Nausea (common initially), facial flushing, spontaneous erections, increased libido, appetite suppression, and mole darkening. |
| Best For |
What They Have in Common
HGH Fragment 176-191, Melanotan II are both commonly used for:
Key Differences
Unique to Melanotan II:
Which Has Stronger Evidence?
- Fat Loss: HGH Fragment 176-191 has stronger research support.
| Goal | HGH Fragment 176-191 | Melanotan II |
|---|---|---|
| Fat Loss | medium | low |
Key Studies
Melanotan II
- Melanotan II nasal spray: a possible risk factor for oral mucosal malignant melanoma?
International journal of oral and maxillofacial surgery, 2025
- Melanotan II User Experience: A Qualitative Study of Online Discussion Forums.
Dermatology (Basel, Switzerland), 2021
- Melanotan II, a melanocortin agonist, partially rescues the impaired thermogenic capacity of pituitary adenylate cyclase-activating polypeptide deficient mice.
Experimental physiology, 2021
Ready to Learn More?
Looking for trusted sources?