Hormones

Cortisol is a stress hormone with important functions. Find out what happens if you have too little or excess cortisol and about corticosteroid drugs.

Dopamine is a chemical messenger in the brain. Learn about its role in mental illness, addiction and Parkinson’s disease, and medicines for imbalances.

Follicle stimulating hormone (FSH) is made by the pituitary gland in the brain. Find out what it does and when your FSH blood level may be tested.

Human growth hormone is a small protein that travels in the bloodstream to stimulate growth. Learn more about the uses of human growth hormone.

Melatonin is a hormone that is made in your brain. It helps to control how and when you sleep. Some people take it as a supplement for sleep problems.

Oestrogen is a female sex hormone which helps control puberty and strengthen bones. Learn how too much or too little can cause health conditions.

Oxytocin is a hormone that is stored and released by your pituitary gland. Learn about how oxytocin helps with labour and breastfeeding.

Serotonin is a chemical messenger that affects wellbeing and happiness. Many antidepressants increase serotonin levels in the brain.

Your testosterone levels can vary depending on your sex, age and health. Learn more about low testosterone, possible causes and symptoms.