GABA and melatonin are two different types of substances and it is impossible to compare which one is better. GABA is gamma-aminobutyric acid, which is an important inhibitory neurotransmitter. Consuming a certain amount of GABA has the effect of improving the quality of sleep, and it can be approved to be added to foods and beverages. Melatonin is a hormone secreted by the pineal gland to regulate the sleep-wake cycle. Melatonin sold on the market is a health product with the health function of improving sleep, but it is not used to treat insomnia. Suffering from insomnia should go to the hospital in time for formal diagnosis and treatment, do not take GABA or melatonin on your own, which will lead to prolonged illness.