HGHs anabolic effects are mediated primarily through IGF-1, which then acts on peripheral tissues such as muscle and bone. Laron, Z., Pediatric Endocrinology Reviews IGF-1 LR3: Direct Muscle Growth Stimulator IGF-1 LR3 binds directly to IGF-1 receptors on muscle fibers, triggering: Muscle cell differentiation and proliferation Activation of satellite cells , essential for muscle repair and new muscle fiber growth Enhanced nutrient uptake (glucose, amino acids, creatine) Because of this direct action , IGF-1 LR3 can stimulate local muscle hypertrophy without relying on systemic conversion pathways
While bolus administration, especially with TZP, was associated with acute weight loss, hydrogel-based formulations mitigated this effect, supporting more stable weight profiles throughout the treatment period ( Figure 5B )
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Legitimacy exists on a spectrum
For many patients, side effects improve over time as the body adjusts