This study looks at two drugs, ECC4703 and ECC0509, for people with MASH, a liver disease. MASH stands for Metabolic Dysfunction-associated Steatohepatitis. One drug is a *Thyroid Hormone Receptor Beta Isoform (THRβ) agonist*, which helps regulate metabolism. The other is a **Semicarbazide Sensitive Amine Oxidase (SSAO) inhibitor**, which affects fat in the liver. This study measures how these drugs, alone and together, reduce liver fat over 12 weeks using MRI scans.
- Participants must be 18 or older and have MASH with specific liver and health criteria.
- The study lasts for 12 weeks, and participants will have MRI scans to track liver fat changes.
- People with other liver diseases, uncontrolled diabetes, or significant recent health issues can't join.
If you join, you'll need to follow study procedures, including taking the medication and attending visits. The study aims to find the best dose for reducing liver fat. As with any clinical trial, there are risks, and it's important to consider your health and the study requirements before participating.