Is there a cure for love sickness? Researchers at the University of Alabama and Tabriz Medical University in Iran found that melatonin and vasotocin might just do the trick.

Intense romantic love is associated with specific physiological, psychological and behavioural changes, including euphoria, obsessiveness, and a craving for closeness with the target.

Some researchers believe such love is a specific emotion, separate from physical sex drive, which works through parts of the brain associated with the reward system, and that the brain chemical dopamine is heavily involved.

The key is the pea-sized pineal gland, which produces melatonin. This hormone plays a key role in the circadian cycle. It has also shown anti-dopamine activities in part of the brain, while a second hormone, arginine-vasotocin, also has a key role in romantic love. The researchers suggest that giving the two hormones may be a cure for non-returned romantic love.