MASH Treatment Enters the 2.0 Era: From Daily Pills to Monthly Shots — GSK’s New Drug Has Arrived GlaxoSmithKline’s (GSK) long-acting FGF21 analog, efimosfermin alfa, has received IND acceptance from China’s Center for Drug Evaluation (CDE), marking a major advancement in MASH therapy with once-monthly dosing. Engineered to overcome the short half-life of native FGF21, efimosfermin alfa demonstrates a triple mechanism—reducing liver fat, combating inflammation, and reversing fibrosis. Phase II data published in The Lancet showed that after 24 weeks, 68% of patients achieved MASH resolution without fibrosis worsening, 89% had ≥30% liver fat reduction, and 32% reached full liver fat normalization. The drug’s efficacy is independent of GLP-1 background therapy. Acquired by GSK for up to $2 billion, efimosfermin alfa is now advancing into global Phase III trials (ZENITH-1/2) with over 1,250 planned enrollments, offering new hope for China’s estimated 200–300 million NAFLD patients, 10–20% of whom may progress to MASH.