PubMed
Melanotan II and its molecular mechanisms
Dorr RT, Dawson BV, Hadley ME, et al. Life Sci. 2009
Compare
Melanotan II vs MK-677
Side-by-side observational reports from PeptIQ users. This compares self-reported patterns — not clinical head-to-head trials.
Last reviewed . By the PeptIQ team.
Observational reporting only — not medical advice. Does not recommend doses, protocols, or treatments.
Melanotan II
46 community reports
Overall experience
From check-in ratings — separate from side effects logged below. Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Favorable 97% · Mixed 3% · Unfavorable overall 0%
Most reported benefits
Benefits users selected when logging a favorable or mixed check-in.
Libido
142
Mood
141
Appetite
73
Most logged side effects
Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Fatigue
2
Nausea
2
Self-reported dose per injection
Median bucket: 0.4–0.6 mg · Most common: 0.2–0.4 mg
Reports span 0.01–2 mg
0.01–0.025 mg
1
0.05–0.1 mg
1
0.1–0.2 mg
7
0.2–0.4 mg
49
0.4–0.6 mg
23
0.6–1 mg
33
1–2 mg
28
Anonymized self-reports from PeptIQ users — not prescribing guidance. Buckets group similar logged amounts; open-ended top buckets mean “at least” that dose.
Commonly stacked with
How repeat users are trending
Among repeat reporters, 94% said they felt similar to their last entry, 6% more positive, and 0% more negative.
Overall, repeat reporters leaned more positive than their previous entry.
Median gap between entries: 50 days · Based on 32 repeat reporters
MK-677
24 community reports
Overall experience
From check-in ratings — separate from side effects logged below. Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Favorable 98% · Mixed 2% · Unfavorable overall 0%
Most reported benefits
Benefits users selected when logging a favorable or mixed check-in.
Sleep
135
Most logged side effects
Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Water retention
2
Fatigue
1
Self-reported dose per injection
Median bucket: 2+ mg · Most common: 2+ mg
Reports span 2 to ≥ 2 mg (open-ended top bucket)
2+ mg
135
Anonymized self-reports from PeptIQ users — not prescribing guidance. Buckets group similar logged amounts; open-ended top buckets mean “at least” that dose.
Commonly stacked with
How repeat users are trending
Among repeat reporters, 91% said they felt similar to their last entry, 9% more positive, and 0% more negative.
Overall, repeat reporters leaned more positive than their previous entry.
Median gap between entries: 156 days · Based on 22 repeat reporters
Sources (8)
Published sources linked on the Melanotan II and MK-677 wiki pages.
- Wiki study page →Source
- Wiki study page →Source
PubMed
LC-HRMS characterization of the skin pigmentation and sexual enhancers melanotan II and bremelanotide sold on the black market of performance and image enhancing drugs
Mestria S, Odoardi S, Frison G, et al. Drug testing and analysis. 2021
- Wiki study page →Source
PubMed
Melanotan II injection resulting in systemic toxicity and rhabdomyolysis
Nelson ME, Bryant SM, Aks SE. Clinical toxicology (Philadelphia, Pa.). 2012
- Wiki study page →Source
PubMed
MK-677, an orally active growth hormone secretagogue: effects on body composition
Murphy MG, Plunkett LM, Gertz BJ, et al. J Clin Endocrinol Metab. 1998
- Wiki study page →Source
PubMed
Two-year treatment with ibutamoren increases bone mineral density, body composition, and quality of life
Nass R, Pezzoli SS, Oliveri MC, et al. J Clin Endocrinol Metab. 2008
- Wiki study page →Source
ClinicalTrials.gov
Ibutamoren (MK-677) studies on ClinicalTrials.gov
ClinicalTrials.gov. Clinical trial registry. 2024
- Wiki study page →Source
PubMed
MK-677, an orally active growth hormone secretagogue, reverses diet-induced catabolism
Murphy MG, Plunkett LM, Gertz BJ, et al. The Journal of clinical endocrinology and metabolism. 1998
- Wiki study page →Source
PubMed
Characterization of growth hormone secretagogue small molecule ibutamoren (MK-0677) and its possible metabolites in thoroughbred horses for doping control
Philip M, Karakka Kal AK, Subhahar MB, et al. Rapid communications in mass spectrometry : RCM. 2022