Human Growth Hormone (HGH) vs Melanotan II
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Human Growth Hormone (HGH)
Human Growth Hormone (somatropin) is a 191-amino acid protein identical to naturally produced GH. FDA-approved for growth hormone deficiency, Turner syndrome, and other conditions. Widely used off-label for anti-aging and performance.
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 | Human Growth Hormone (HGH) | Melanotan II |
|---|---|---|
| Dose Range | 200 mcg–2 mg | 250 mcg–1 mg |
| Frequency | 1x daily | 1x daily |
| Cycle Length | 12–24 weeks | 1–2 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Binds to GH receptors throughout the body, stimulating IGF-1 production in the liver. Promotes protein synthesis, fat metabolism, and cellular regeneration across multiple tissues. | 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 | Medical: 0.1-0.3mg/kg/week divided into daily doses. Anti-aging: 1-2 IU daily. Performance: 2-6 IU daily, sometimes higher. | 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, preferably at night to mimic natural pulsatile release. Rotate injection sites. Store refrigerated. | Subcutaneous injection. Usually combined with UV exposure for tanning effects. Nasal spray formulations exist but have lower bioavailability. |
| Side Effects | Joint pain, water retention, carpal tunnel syndrome, potential insulin resistance, and acromegaly features with long-term high doses. | Nausea (common initially), facial flushing, spontaneous erections, increased libido, appetite suppression, and mole darkening. |
| Best For |
What They Have in Common
Human Growth Hormone (HGH), Melanotan II are both commonly used for:
Key Differences
Unique to Human Growth Hormone (HGH):
Unique to Melanotan II:
Which Has Stronger Evidence?
- Fat Loss: Human Growth Hormone (HGH) has stronger research support.
| Goal | Human Growth Hormone (HGH) | Melanotan II |
|---|---|---|
| Fat Loss | high | low |
Key Studies
Human Growth Hormone (HGH)
- Transgenic Artifacts Caused by Passenger Human Growth Hormone.
Trends in endocrinology and metabolism: TEM, 2018
- [Human growth hormone and Turner syndrome].
Anales de pediatria (Barcelona, Spain : 2003), 2017
- Significance of the disulphide bonds of human growth hormone.
Endokrynologia Polska, 2013
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
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