Which herbal supplement might be beneficial for a client with intermittent insomnia?

Valerian root is widely recognized for its potential calming effects and has been traditionally used to treat insomnia and promote better sleep quality. Research suggests that valerian may help reduce the amount of time it takes to fall asleep and improve overall sleep quality without the groggy side effects often associated with prescription sleep aids. Its sedative properties are believed to be associated with the increased levels of a neurotransmitter called gamma-aminobutyric acid (GABA), which helps to calm the nervous system.

In contrast, raspberry leaf tea is often used for its nutritional benefits and is not specifically known for treating sleep disorders. Glucosamine primarily serves as a supplement for joint health and does not have any direct effects on sleep. Black cohosh is commonly used for managing menopausal symptoms rather than insomnia. The focus on valerian root for addressing intermittent insomnia makes it the most beneficial choice among the options presented.