In my experience reviewing the clinical data, early weight loss in week one is mostly water and reduced food intake, not fat loss
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In the United States, for example, the use of certain peptides is not approved by the FDA, and they are considered a gray area in sports and bodybuilding
Glucagon-like peptide-1 (GLP-1) receptor agonists have revolutionized type 2 diabetes and obesity treatment, but many carry an FDA boxed warning regarding thyroid C-cell tumors, including medullary thyroid carcinoma (MTC)
Truveta reported in September 2025 that 6.5% of all prescriptions recently written were for a GLP-1 drug and that 2.5 million patients had filled 12.2 million prescriptions since 2017
3 They are useful add-on therapies to attenuate motor fluctuations in patients treated with carbidopa/levodopa