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
Compare
MK-677 vs Pentosan Polysulfate
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.
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
Pentosan Polysulfate
6 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 0% · Mixed 17% · Unfavorable overall 83%
Most reported benefits
Benefits users selected when logging a favorable or mixed check-in.
Recovery
6
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.
Digestive upset
6
Self-reported dose per injection
Median bucket: 0–25 mcg · Most common: 0–25 mcg
Reports cluster around 0–25 mcg
0–25
6
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
Sources (9)
Published sources linked on the MK-677 and Pentosan Polysulfate wiki pages.
- Wiki study page →Source
- 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
- Wiki study page →Source
FDA Drug Label
ELMIRON (pentosan polysulfate sodium) — Prescribing Information
Janssen Pharmaceuticals. FDA Drug Label. 1996
- Wiki study page →Source
PubMed
Pentosan polysulfate sodium for knee osteoarthritis: systematic review
Bannuru RR, Osani MC, Vaysbrot EE, et al. Osteoarthritis Cartilage. 2020
- Wiki study page →Source
PubMed
New therapeutic strategies in osteoarthritis
Siddiq MAB, Oo WM, Hunter DJ. Joint bone spine. 2024
- Wiki study page →Source
PubMed
The pathobiology of osteoarthritis and the rationale for the use of pentosan polysulfate for its treatment
Ghosh P. Seminars in arthritis and rheumatism. 1999