Valerian and sleep: forms, evidence and precautions

Valerian is a familiar sight in the sleep-aid aisle. It has a reputation as a gentle remedy, but the evidence is mixed. Root tea, powdered root in capsules, water-and-alcohol extracts and licensed herbal medicines cannot all be assessed as the same product.

The EMA distinguishes certain dry extracts made using ethanol, assessed under its regulatory framework, from other preparations supported mainly by traditional use. Insomnia trials have produced inconsistent results, with wide variation in preparations, doses and outcome measures. [1][3][4]

Medicinal valerian consists mainly of the root and other underground parts of Valeriana officinalis. Depending on the product, these may be chopped, powdered, extracted using water or alcohol, or combined with other herbs such as hops.

These differences matter when interpreting the research. A study of a specific extract does not establish that homemade tea works. Results from a multi-herb product cannot be attributed to valerian alone. The extraction ratio, solvent and dose are not minor technical details: they determine which preparation the evidence applies to.

Available reviews do not support valerian as a reliable treatment for chronic insomnia. A 2015 systematic review of several medicinal herbs found no consistent, significant effect on the outcomes assessed. A 2024 umbrella review likewise found no clear benefit on objective measures of insomnia. [3][4]

Some people report subjective improvements: feeling that they sleep better, fall asleep more easily or have a more restful night. Those experiences matter, but they are not enough to establish valerian as a standard treatment.

In its 2017 guideline on chronic insomnia in adults, the American Academy of Sleep Medicine suggested that valerian should not be used to treat difficulty falling or staying asleep. This does not mean that no one will ever notice an effect. It means that the evidence, potential benefits and risks do not justify recommending it as a standard option.

For persistent sleep problems, the priority is to identify what is contributing to them: sleep schedules, light exposure, caffeine, alcohol, anxiety, pain, sleep apnoea, medicines or daily routines. Valerian should not mask a treatable cause.

Valerian can cause drowsiness, digestive problems, headaches or unusual dreams. Combining it with alcohol, sedatives, anti-anxiety medicines, sleeping pills, antihistamines or other supplements used for relaxation may further reduce alertness.

Drowsiness matters when driving, operating machinery or working nights, and for frail people at risk of falls. Seek professional advice if you are pregnant or breastfeeding, have liver disease, take long-term medication or have surgery planned.

A well-labelled product specifies the plant part, preparation, dose, extract details and instructions for use. Claims such as “guaranteed deep sleep” or “no more night-time waking” go well beyond the available evidence.

A short trial may be worth discussing for an adult without risk factors, provided the preparation is clearly identified and expectations are realistic. If sleep remains poor, increasing the dose or combining several herbs rarely helps clarify what is happening.

Valerian needs to be assessed preparation by preparation. Some forms have recognised medicinal or traditional uses, and some people report subjective benefits. Yet the evidence for chronic insomnia and objectively measured sleep outcomes remains too inconsistent. The sensible approach is to check the preparation, limit combinations with other sedating substances and investigate the cause if sleep problems persist.