Insulin-like growth factor 1 (IGF-1) is a protein that plays a key role in the regulation of growth and development in humans and other animals. It is produced primarily in the liver in response to growth hormone stimulation and acts on target tissues to promote cell growth and division. IGF-1 also plays a role in regulating metabolism, muscle growth, and bone density. Research in the area of IGF-1 focuses on understanding its various functions in the body, its role in health and disease, and its potential therapeutic applications for conditions such as growth disorders, muscle wasting, and age-related diseases.