“…Many other tissues also produce IGF‐I locally, such as brain, muscle, and other organs (Moriyama et al, 2000). GH regulates IGF‐I in blood and tissue, and IGF‐I peptide and mRNA expression in response to varying nutritional conditions and season (Choi et al, 2018; Moon & Choi, 2018; Schmid et al, 2003). However, further research is required to clarify cause–effect relationships.…”