Valerian Root

📜 Historical Use

The two federal sources describe two different traditional valerians, and the difference is instructive. NCCIH records that valerian has been used medicinally since the times of early Greece and Rome, historically to treat insomnia, migraine, fatigue and stomach cramps. LiverTox records something else: that valerian has been used for centuries in Europe, usually for digestive and urinary problems. The name itself carries no indication at all — it derives from the Latin valere, meaning to be in good health. Only the sleep thread is common to both accounts, and even the classical record pairs it with migraine and stomach cramps rather than presenting it as a dedicated hypnotic. The list of activities claimed for the herb has always been long and loose: sedative, hypnotic, anxiolytic, anticonvulsant, antispasmodic and antidepressant. Today valerian is promoted for insomnia, anxiety, stress and depression, and it is used most commonly as a sleeping aid and for therapy of stress. It also circulates in a form no traditional user would recognise. Valerian is found in many relaxation drinks — a 2011 review counted more than 300 bottled beverages available in the United States, some containing valerian as an anxiolytic and sleeping aid, marketed under names such as Drank, iChill and Slow Cow. Other names in circulation include all-heal, garden heliotrope, Tagara and Indian valerian.

📊 What the Research Shows

This is the section where valerian parts company with its reputation, and the parting is not close. NCCIH states that knowledge about valerian is limited because a relatively small amount of research has looked at its effects, and that there is not enough evidence to determine whether valerian is useful for any health condition. On sleep — the use it is sold for almost exclusively — the evidence is described as inconsistent, and in its 2017 clinical practice guidelines the American Academy of Sleep Medicine recommended against using valerian for chronic insomnia in adults. NCCIH repeats that verdict in its sleep fact sheet: clinical trials have had inconsistent results and the value of valerian for insomnia has not been demonstrated. A professional body recommending against a supplement is a stronger negative signal than an insufficient-evidence verdict, and it is the single most important fact on this page. Menopause is the one area with any positive signal: three small studies suggest valerian might be helpful for menopause symptoms, but there is not enough evidence to know for certain. For anxiety, depression, premenstrual syndrome, dysmenorrhea, stress and other conditions, there is not enough evidence to allow any conclusions — which covers three of the four uses valerian is promoted for today. LiverTox cites a 2016 review of sleep medicines in older adults finding valerian has a small impact on sleep latency and can produce residual sedation.

Take 300-600mg extract 30 min before bedtime, or steep dried root as tea.

Don't combine with alcohol or sleep meds.

⚠️ What happens if taken in excess:

High doses (>1800mg) can cause headaches, excitability (paradoxical effect), uneasiness, and morning grogginess. May cause liver damage with chronic excessive use. Combining with alcohol or sedatives can cause dangerous over-sedation. Do not drive after high doses. Withdrawal symptoms possible after prolonged high-dose use.

One instruction here is specific, and everything else is an honest gap. NCCIH states that because it is possible, though not proven, that valerian might have a sleep-inducing effect, it should not be taken along with alcohol or sedatives. That is the only named class in the entire federal record read for this page, and it is the interaction most likely to matter in practice, because valerian is bought by people who are already taking something for sleep. LiverTox supplies the mechanistic reason to take it seriously — components of valerian are believed to interact with the GABA receptor in a manner similar to the benzodiazepines — but that is a belief about a mechanism, not a documented interaction with a named drug, and it should not be reported as one. What is absent is worth stating plainly: none of the three federal sources read for this page names a cytochrome P450 enzyme, a drug transporter, or a single prescription medicine in connection with valerian. There is no catalogued profile of the kind that exists for St John's wort. The case literature shows co-medication rather than interaction — one published liver-injury case occurred in a woman taking indapamide chronically, and one overdose series involved a multi-ingredient hypnotic that also contained hyoscine and cyproheptadine. Absence of a documented interaction is not demonstrated safety alongside a prescription. NCCIH's standing advice applies: if you take any type of medicine, talk with your health care provider before using valerian.

1. Valerian for sleep: a systematic review and meta-analysis — Bent S et al Am J Med (2006)[PubMed ↗]
2. Valerian — National Institutes of Health — Office of Dietary Supplements NIH Fact Sheet (2020)[NIH ↗]
3. Critical evaluation of the effect of valerian extract on sleep structure — Donath F et al Pharmacopsychiatry (Thieme) (2000)[doi ↗]