Kalms Day tablets contain a natural ingredient called valerian root, which is traditionally used to ease feelings of restlessness and stress. It is thought to have a calming effect which may help to ease mild anxiety or stress and is a popular herbal remedy with those who are searching for that sense of calm.

Kalms is a traditional herbal remedy that primarily affects the brain through the calming properties of Valerian root and Hops. In 2026, these botanical extracts are used to relieve "the stresses of everyday life" and irritability. Valerian root contains compounds that are believed to interact with gamma-aminobutyric acid (GABA) receptors in the brain; GABA is a neurotransmitter that helps regulate nerve impulses and reduces the activity of neurons, leading to a sedative and "calming" effect. Unlike prescription benzodiazepines, Kalms works more subtly to ease mild anxiety and restlessness without the high-value risk of heavy sedation or chemical dependency for most users. However, because they act as a "mild depressant" on the central nervous system, they can cause drowsiness, making it a premier choice for aid in sleep but something to be used cautiously if you need to remain highly alert or drive during the day.