Valerian root has been used for centuries to promote relaxation, improve sleep and ease nervous tension, with modern research examining its potential benefits for insomnia, anxiety, menstrual discomfort and menopausal symptoms, although clinical evidence remains mixed.
By yourNEWS Media Newsroom
Valerian root, a traditional herbal remedy used for sleep disturbances and anxiety, continues to attract scientific interest because of its naturally occurring compounds that may influence the nervous system. Although some studies suggest benefits for relaxation, perceived sleep quality and menopausal symptoms, researchers caution that stronger evidence is needed to establish its effectiveness.
Derived from Valeriana officinalis, a perennial flowering plant native to Europe and Asia, valerian has a long history in herbal medicine. The plant produces clusters of fragrant white or pink flowers, but its underground roots and rhizomes contain the compounds most commonly used in medicinal preparations.
According to the National Institutes of Health’s Office of Dietary Supplements, valerian was used medicinally in ancient Greece and Rome. The Greek physician Hippocrates described its therapeutic properties, while Galen recommended it for insomnia during the second century.
Valerian later appeared in the United States Pharmacopeia from 1820 to 1936 and the National Formulary from 1888 to 1946, reflecting its historical recognition as a medicinal plant.
Today, valerian is widely available as capsules, tablets, tinctures, powders and herbal teas, particularly in products marketed for sleep and relaxation.
Researchers have identified numerous biologically active compounds in the plant, including valerenic acid, valepotriates and other naturally occurring substances.
Some laboratory studies suggest that these compounds influence gamma-aminobutyric acid, commonly called GABA, a neurotransmitter involved in regulating nervous system activity.
GABA helps reduce neuronal excitability and plays a role in relaxation and sleep regulation.
Valerenic acid has demonstrated activity involving GABA-A receptors in laboratory research, providing one possible explanation for valerian’s traditional reputation as a calming herb.
However, researchers have not established precisely how valerian produces its effects in humans or whether any single compound accounts for its reported benefits.
Sleep improvement remains valerian’s most extensively studied potential application.
Some clinical trials have reported improvements in participants’ subjective assessments of sleep quality, including reduced difficulty falling asleep and fewer perceived disturbances.
Other studies have failed to demonstrate meaningful differences between valerian and placebo.
A 2024 umbrella review published in European Neuropsychopharmacology examined eight systematic reviews evaluating valerian for sleep disorders.
The researchers found no convincing evidence that valerian effectively treats insomnia, although some studies suggested improvements in self-reported sleep quality.
The review also noted that differences in supplement formulations, dosages and study designs complicated comparisons.
Similarly, the National Center for Complementary and Integrative Health states that clinical evidence remains inconsistent.
The American Academy of Sleep Medicine recommended against using valerian to treat chronic insomnia in adults because available studies had not demonstrated sufficient effectiveness.
Despite those findings, valerian remains popular among individuals seeking nonprescription options for occasional sleep difficulties.
Commercial preparations frequently contain 300 to 600 milligrams of valerian extract, while herbal teas may contain dried root steeped in hot water. These quantities reflect commonly used preparations rather than a medically established effective dose.
Valerian has also been investigated for anxiety and stress.
Its potential interaction with GABA receptors has prompted comparisons with medications that reduce excessive nervous system activity.
However, the evidence supporting valerian for anxiety disorders remains limited.
The NIH’s review of complementary approaches to anxiety concludes that existing research is insufficient to determine whether the herb reliably reduces anxiety symptoms.
Animal research has identified potential effects on behavior and nervous system activity, but these findings cannot establish effectiveness in humans.
A 1996 study published in Phytotherapy Research examined valerian extracts in mice and found anticonvulsant activity under experimental conditions.
The researchers observed effects consistent with possible GABA-related activity, although the results did not establish that valerian treats seizures, anxiety or other neurological conditions in humans.
Beyond sleep and anxiety, some researchers have investigated valerian’s potential benefits for menopausal symptoms.
A 2013 randomized, double-blind clinical trial involving 68 menopausal women examined whether valerian supplementation could reduce hot flashes.
Participants received either placebo or 255 milligrams of valerian three times daily for eight weeks.
Women taking valerian experienced statistically significant reductions in the frequency and severity of hot flashes compared with the placebo group.
The findings suggest that valerian may offer benefits for some menopausal symptoms, but the study was relatively small.
NIH researchers note that three small studies have reported possible benefits for menopause-related symptoms, while emphasizing that the evidence is insufficient to establish effectiveness.
Valerian has also traditionally been used for menstrual cramps, premenstrual syndrome, headaches, migraines and digestive discomfort.
Herbal practitioners have attributed some of these applications to possible muscle-relaxing and antispasmodic effects.
Nevertheless, human clinical research remains too limited to support firm conclusions about these uses.
Claims that valerian can reliably lower blood pressure, treat joint pain or prevent migraines are also not established by high-quality clinical evidence.
Safety is another important consideration.
Valerian is generally considered well tolerated by most healthy adults when used for short periods, but it is not free from potential adverse effects.
According to the NIH, reported side effects include headaches, digestive upset, dizziness, mental dullness, excitability, uneasiness and vivid dreams.
Some individuals may experience drowsiness or reduced alertness after taking valerian, particularly when it is combined with other substances that affect the central nervous system.
For this reason, people should avoid driving or operating dangerous machinery if they experience sedation.
Valerian may also interact with alcohol, prescription sedatives, sleeping medications and certain supplements.
Combining the herb with benzodiazepines, barbiturates or other central nervous system depressants could intensify sedative effects.
People using medications such as diazepam, lorazepam or other sleep-inducing drugs should consult a health care professional before taking valerian.
The safety of extended use remains uncertain.
NIH guidance indicates that valerian has been used with apparent safety in daily doses of 300 to 600 milligrams for up to six weeks, but reliable long-term safety data are unavailable.
Abrupt discontinuation after prolonged use has occasionally been associated with withdrawal-like symptoms, including anxiety, irritability and sleep disturbances.
Rare cases of liver injury have also been reported, particularly when valerian was used alongside other herbal preparations.
Pregnant or breastfeeding women should avoid valerian unless specifically advised by a qualified health care professional because its effects during pregnancy and lactation have not been adequately studied.
Parents should also seek medical guidance before giving valerian preparations to children.
Another consideration is product quality.
In the United States, valerian is generally marketed as a dietary supplement rather than an FDA-approved medication for treating insomnia or anxiety.
Manufacturers are responsible for ensuring their products comply with applicable safety and labeling requirements, but dietary supplements do not undergo the same premarket approval process required for prescription drugs.
The concentrations of valerenic acid and other constituents may differ between products, potentially affecting consistency.
Consumers considering valerian should select clearly labeled products from reputable manufacturers and discuss possible interactions with a pharmacist or health care provider.
For persistent insomnia, established treatments such as cognitive behavioral therapy for insomnia have stronger scientific support than herbal supplements.
Likewise, individuals experiencing ongoing anxiety, severe menstrual pain or disruptive menopausal symptoms should seek medical evaluation rather than relying exclusively on herbal remedies.
Valerian’s longstanding medicinal history and laboratory findings provide reasons for continued investigation, particularly into its effects on sleep regulation and nervous system signaling.
However, its traditional uses should not be confused with clinically proven treatments.
Current research suggests that valerian may improve perceived sleep quality for some people and could help relieve certain menopausal symptoms, but evidence for insomnia, anxiety and most other claimed benefits remains insufficient.
For individuals interested in herbal approaches to relaxation, valerian may be an option worth discussing with a health professional, provided its limitations, potential interactions and uncertain long-term safety are taken into account.
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