Pineal gland
Find out about the pineal gland. This is a very small gland in your brain that makes the hormone melatonin, which controls your internal body clock.
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Endocrine glands and their hormones
Find out more about the endocrine glands and hormones in your body, such as the pituitary gland, thyroid gland and adrenal glands.
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Hormonal system
The endocrine (hormonal) system influences your metabolism, growth and other functions. Learn more about what it is and related conditions.
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Melatonin
Melatonin is a hormone that is naturally made in your body. It helps to control how and when you sleep. It can be taken as a medicine if you have sleep problems.
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Bipolar disorder
Bipolar disorder is a mental-health condition in which people experience periods of depression and mania. Learn about its symptoms and treatment.
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