Insulin-Like Growth Factor 1 (IGF-1) is a hormone that is similar in structure to insulin and works with Growth Hormone to reproduce and regenerate cells.
Growth Hormone, made by the pituitary gland, stimulates the liver to produce IGF-1 and IGF-1 subsequently stimulates growth in cells throughout the body, leading to growth and development (as in the womb and through adolescence), strengthening of tissues (improving bone density, building muscle), and healing (skin, bones, gut lining, etc.), depending on what the body needs.
IGF-1 measurements are adjusted for age because levels tend to decrease as you get older.
Results of IGF-1 are given in nanograms per milliliter (ng/mL). Normal ranges by age are:
- 182 to 780 ng/mL for ages 16 to 24
- 114 to 492 ng/mL for ages 25 to 39
- 90 to 360 ng/mL for ages 40 to 54
- 71 to 290 ng/mL for people 55 and older
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