Melatonin is a hormone that is produced by the pineal gland in the brain. Melatonin levels vary in 24 hour cycles and are controlled by our body clock. Normally its production is reduced by being in bright light. Levels increase at night.

The levels of melatonin in the body tend to decrease with age and low levels may result in sleep disturbances such as insomnia, poor immune function, depression and other mood disorders.

Salivary 3 samples. Due to its circadian rhythm, melatonin must be collected between 10pm and midnight in the dark).

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