Novo’s UBT251 Phase 2 results published in Cell Metabolism: 19.7% weight loss at 24 weeks
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A new peer-reviewed publication in Cell Metabolism, Here released on October 7, provides a detailed scientific assessment of the previously announced Phase 2 results for UBT251, a triple agonist jointly developed by Novo Nordisk and United Biotechnology.
In a Phase 2 trial involving 205 participants, UBT251 achieved up to 19.7% average weight loss after 24 weeks, compared with 2.0% for placebo (17.7 percentage points placebo-adjusted). The 19.7% result came specifically from the 4 mg group starting at 1 mg.
In the 24-week Phase 2 trial, 143 of 155 UBT251-treated participants (92.3%) experienced at least one adverse event, compared with 88.0% in the placebo group. Most were gastrointestinal and mild to moderate. Grade 3 or higher adverse events occurred in 9.0% of UBT251 recipients versus 4.0% on placebo.
Treatment discontinuation due to adverse events was relatively uncommon. Novo Nordisk previously reported discontinuation rates of 0% in the 2 mg and 6 mg groups and 4% in the combined 4 mg group. However, these figures should not be confused with overall trial dropout rates.
Interestingly, Lilly's retatrutide achieved 17.5% weight loss at 24 weeks in its earlier Phase 2 trial. However, these are separate studies, so the results do not establish that UBT251 is more effective or better tolerated.
Novo holds development and commercialisation rights outside Greater China.
These results are not new, as Novo first announced them in February 2026. However, this is the first time the full Phase 2 findings have been published in a peer-reviewed scientific journal, providing a more detailed assessment of efficacy, safety, and tolerability.