Glucagon remains below 0.3% even at 15 mg, ruling out the glucagon-driven liver and heart effects seen with retatrutide. GIPR: the identity receptor At the 2.5 mg starter dose, GIP receptor occupancy is already about 13%
To note, an increased need for oral levothyroxine has been described in patients with the opposite motility disorder, i.e
Where GLP-1 therapy may be useful in a brain-health plan For selected patients, GLP-1 therapy may support brain health indirectly by improving the systems that influence cognitive risk
By Route of Administration: Parenteral dominates, Oral growing fastest Parenteral (subcutaneous injection) delivery held the dominant route of administration position in 2025, reflecting that all high-dose, high-efficacy GLP-1 formulations currently approved for obesity management require injection for the delivery of drug quantities sufficient to achieve therapeutic plasma concentrations
The glucagon component may also contribute to reduced hepatic lipid accumulation, which improves hepatic insulin sensitivity over time
If you want to start GLP-1 therapy now, Zepbound (tirzepatide) is FDA-approved and produced up to 17.8% weight loss in clinical trials as a dual GLP-1/GIP agonist