in a 2025 narrative review [90]
Kelly AS, Auerbach P, Barrientos-Perez M, Gies I, Hale PM, Marcus C (2020) A randomized, controlled trial of liraglutide for adolescents with obesity
Lack of FDA Regulation Unlike prescription medications, dietary supplements are not approved or regulated by the FDA for safety, effectiveness, or consistency.This means: Ingredients and potency can vary widely between brands and batches
Direct Metabolic Effects Lipolysis and Insulin Antagonism Beyond IGF-1-mediated anabolic effects, HGH 191AA exerts direct metabolic actions via GHR signalling: stimulating lipolysis in adipose tissue (increasing free fatty acid mobilisation), promoting nitrogen retention and protein synthesis in muscle, and antagonising insulin signalling producing a relative insulin resistance in peripheral tissues that directs metabolic substrate use towards fat oxidation and spares carbohydrate for glucose-dependent tissues