MK-677 (Ibutamoren) news and clinical trials
Also known as: MK-677 · Ibutamoren · Ibutamoren mesylate · MK-0677 · MK677 · LUM-201 · L-163,191
Updated 26 sources
4 trial updates and 6 new studies in the last 12 months, newest first: trial registrations and results, PubMed papers, FDA actions and press coverage that name MK-677 (Ibutamoren). Each line links to the primary source.
October 2026
- StudyPubMedPeptides in urology and sexual medicine: clinical effectiveness, dosing, indications, and safety: a narrative review (opens PubMed)
A narrative review of 76 studies on peptide use in urology and sexual medicine found that while some agents like Bremelanotide and Tesamorelin have clinical backing, many others like CJC-1295 remain unvalidated and accessible only through unregulated markets.
Sexual medicine reviewsReviewPMID 42862021
August 2026
- StudyPubMedPeptide Supplements and Their Therapeutic Applications in Sports Medicine (opens PubMed)
A scoping review concluded that claims regarding peptide supplements for musculoskeletal recovery remain unsubstantiated by current human trials. Authors warned of potential risks including cardiovascular complications.
The American journal of sports medicinePMID 42578445 - New trialClinicalTrials.govEvaluating the Efficacy and Safety of LUM-201 Plus Semaglutide Versus Semaglutide Plus Placebo in Older Obese Adults (opens ClinicalTrials.gov)
Lumos Pharma registered a phase 2 trial to evaluate the efficacy and safety of LUM-201 as an adjunct to oral semaglutide in 202 obese adults between the ages of 60 and 85 years. The study is not yet recruiting.
NCT07754045Phase 2not yet recruiting
July 2026
- StudyPubMedStriosomal ghrelin receptor activity controls reward-cost integration (opens PubMed)
Researchers found that moderate doses of the ghrelin receptor agonist ibutamoren increased cost sensitivity in rats during conflict-based decision-making. This effect was linked to increased neuronal activity in dorsomedial striosomes.
Research squarePMID 42396509
June 2026
- StudyPubMedRapid and harmonized analytical workflow for the determination of peptidic and non-peptidic doping agents in dried and liquid blood matrices (opens PubMed)
Researchers reported a fast analytical workflow to detect 54 prohibited doping compounds in dried blood spots, serum, and plasma using liquid chromatography and mass spectrometry. The study found that storing samples in dried matrices allows for non-refrigerated transport, reducing costs.
The AnalystPMID 42328738 - Results postedClinicalTrials.govPhase 2 Study of LUM-201 in Children With Growth Hormone Deficiency (OraGrowtH210 Trial) (opens ClinicalTrials.gov)
Lumos Pharma completed a phase 2 trial of daily oral LUM-201 in 104 prepubertal children with idiopathic growth hormone deficiency. The study investigated LUM-201 as a treatment and assessed a predictive enrichment marker strategy to select likely responders.
NCT04614337Phase 2completed
May 2026
- StudyPubMedSpontaneous Splenic Rupture in a Patient With Recent Use of Performance-Enhancing Compounds: A Case Report and Literature Review (opens PubMed)
Doctors reported a case of a 54-year-old male who required a splenectomy for atraumatic splenic rupture after using MK-677 and RAD-140. The study authors suggest the use of performance-enhancing compounds may have been a contributing factor in the context of a vascular malformation.
CureusCase reportPMID 42064485
April 2026
- Results postedClinicalTrials.govPhase 2 Study of LUM-201 in Children Who Have Previously Completed the LUM-201-01 Trial (OraGrowtH213) (opens ClinicalTrials.gov)
Lumos Pharma completed a phase 2 study evaluating the growth and safety of LUM-201 in 15 children with idiopathic growth hormone deficiency who had previously received 12 months of rhGH treatment.
NCT05250063Phase 2completed
January 2026
- Results postedClinicalTrials.govThe Impact of Ibutamoren on Nonalcoholic Fatty Liver Disease (opens ClinicalTrials.gov)
Massachusetts General Hospital completed a pilot phase 2 study of 12 participants to investigate if LUM-201 could decrease intrahepatic lipid accumulation in patients with nonalcoholic fatty liver disease.
NCT05364684Phase 2completed
November 2025
- StudyPubMedAcute stress suppresses hunger-driven food seeking through PVN activation: Reversal by anxiolytic drug and ghrelin receptor agonist, with anxiolytic-like effects of refeeding (opens PubMed)
Researchers found that acute stress in mice suppressed hunger-driven food seeking via activation of the paraventricular hypothalamic nucleus. Administration of the ghrelin receptor agonist MK-677 reversed this suppression by inhibiting specific neurons in that region.
Neuroscience researchPMID 41260416
Searched as: MK-677, Ibutamoren, MK-0677, LUM-201. Summaries are one or two sentences, published only when every number in them appears in the source record. A tracker, not medical advice.