This is likely due to it being endogenously synthesized all throughout the body and it is basically found in all cells, sometimes in rather high concentrations
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Keller J, Binnewies U, Rsch M, Juul Holst J, Beglinger C, Andresen V, Layer P (2015) Gastric emptying and disease activity in inflammatory bowel disease
In a 2023 Phase 2 trial published in the New England Journal of Medicine (Jastreboff et al.), retatrutide produced 22.8% to 24.2% mean weight loss at 48 weeks at the higher doses (8 to 12 mg)
Spinach, for instance, provides iron and vitamin A, and lean chicken and fish deliver amino acids