Human growth hormone (GH) is produced by the pituitary gland. It is essential for growth and plays an important role in how the body uses food for energy (a process called metabolism). The amount of GH in the blood changes throughout the day and is affected by exercise.sleep.emotional stress.and diet. In adults.excess GH is usually caused by a noncancerous tumor of the pituitary gland called an adenoma. Excess GH can lead to an abnormal bony enlargement of the face.jaw.hands.and feet (acromegaly). Growth hormone can cause the release of other substances (called factors) that affect growth. One of these is insulin-like growth factor 1 (IGF-1). When the GH level is abnormally high. The IGF-1 level is usually high as well. A test for IGF-1 may be done to confirm high GH levels.
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