Overview
Valerian (Valeriana officinalis) is a flowering plant whose dried root is one of the most widely used herbal sleep aids in the world1. Modern research has focused mainly on two things: whether it helps people fall and stay asleep, and whether it eases anxiety.
A systematic review pooling 16 randomized, placebo-controlled trials in 1,093 people found a statistically significant benefit for sleep quality, though most of the individual trials had methodological weaknesses and doses, extracts, and treatment lengths varied a lot between studies2. A larger and more recent meta-analysis covering 60 studies and almost 6,900 people also found valerian improved subjective sleep quality and reduced anxiety, when the data from many smaller trials were combined3. A 2024 randomized, double-blind, placebo-controlled trial in 80 adults with sleep complaints tested a standardized valerian root extract against placebo for 8 weeks, tracking sleep quality (using the Pittsburgh Sleep Quality Index) and sleep latency (using a wrist-worn sleep tracker), and reported improved overall sleep quality with the extract1. A separate Cochrane-style review focused specifically on anxiety disorders, evaluating whether valerian is an effective and safe treatment option4.
Is this for you?
Why are you considering valerian?
This is not medical advice — just general orientation.
Safety
- The reviewed studies do not report a detailed side-effect or contraindication profile from human trials. The Cochrane-style review of valerian for anxiety disorders specifically set out to evaluate safety alongside effectiveness, but the brief does not provide the specific safety findings from that review4. No data on use during pregnancy or breastfeeding, in children, or in specific medical conditions was found in the reviewed studies — treat this as an open gap rather than an assumption of safety.
Dosage
The reviewed studies did not use a single consistent dose — a systematic review of 16 trials noted that valerian doses, preparations (extracts vs. whole root), and treatment lengths "varied considerably" between studies, which the authors flagged as a likely reason for inconsistent results2. The 2024 randomized controlled trial tested a standardized Valeriana officinalis extract taken daily over an 8-week period, but the brief does not specify the exact milligram amount used1. Because of this variability, no single reliable "studies used X mg/day" figure can be given from this research brief.
Where to find it
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Interactions
No drug or herb interaction data was found in the reviewed studies.
Traditional Use
Ayurveda
India · over 3,000 years
Ayurveda knows a herb called tagara — but it is a DIFFERENT SPECIES: Valeriana jatamansi (synonym V. wallichii), a Himalayan relative of European valerian. That this is geography rather than a mix-up of names is clear from distribution data: Valeriana officinalis has no recorded occurrences in India (its range is Britain, the Netherlands, France, and central and northern Europe), while V. jatamansi grows in China, Pakistan, India, Nepal and Bhutan. Classical Ayurveda could not have known European valerian. In the Sushruta Samhita (Bhishagratna translation, 1907), tagara appears as an ingredient of compound preparations rather than a standalone sleep remedy: in a medicated ghee for a child moving on to solid food, in the aromatic oil Gandha-taila cooked in cow's milk, and among the substances of a warming regimen alongside saffron, aguru and cardamom. No standalone claim about sleep or insomnia appears in the passages read. The verdict is therefore "unstudied" rather than "refuted": Ayurveda says nothing about whether European valerian helps sleep — it used a different plant, for different purposes.
What the science says
Not yet studiedWestern Herbalism
Europe · centuries of folk use
In Culpeper's Complete Herbal (1653), garden valerian is listed under the influence of Mercury and credited with a "warming faculty": dried root in a drink was said to promote urination and ease difficult urination, a decoction was used for pains in the sides and to bring on menstruation, and the root boiled with liquorice, raisins, and aniseed was recommended for those short of breath or coughing. It was also given for venomous bites and stings, credited with "a special virtue against the plague," and used to expel wind and ease headache when crushed fresh and applied to the head. Strikingly, Culpeper's entry contains no mention of sleep, insomnia, calming, or sedation at all. That association appears only later: King's American Dispensatory (1898) and Felter's Eclectic Materia Medica (1922) reclassify valerian as a remedy for the nervous system, linking it to nervous conditions and hysteria (the era's diagnosis for nervous complaints) and to sleep.
What the science says
DisputedModern trials and meta-analyses do support valerian's use for sleep2,3,1, but this directly refutes the idea that European herbalism valued it for sleep "from the start" — the sleep/nervous-system use only entered the written tradition roughly two and a half centuries after Culpeper.
Evidence Strength
Valerian for sleep is backed by multiple systematic reviews and meta-analyses pooling thousands of participants across dozens of trials, plus a recent standalone randomized controlled trial, giving it a reasonably solid evidence base for improving subjective sleep quality — though the reviews themselves note that individual trials varied widely in quality, dose, and preparation, which limits precision about "how much" and "which extract" works best. Evidence for anxiety is present but less developed, resting on one dedicated review of mixed and less conclusive findings. No human safety or interaction data was found in this research brief, which is a real gap despite valerian's popularity.
Frequently Asked Questions
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any supplement regimen or making changes to your diet, especially if you have a medical condition or take medications.
Sources
- 1
Chandra Shekhar H, et al.. Standardized Extract of Valeriana officinalis Improves Overall Sleep Quality in Human Subjects with Sleep Complaints: A Randomized, Double-Blind, Placebo-Controlled, Clinical Study.. Advances in therapy. 2024.
Strong EvidencePubMed ↗ - 2
Bent S, et al.. Valerian for sleep: a systematic review and meta-analysis.. The American journal of medicine. 2006.
Strong EvidencePubMed ↗ - 3
Shinjyo N, et al.. Valerian Root in Treating Sleep Problems and Associated Disorders-A Systematic Review and Meta-Analysis.. Journal of evidence-based integrative medicine. 2020.
Strong EvidencePubMed ↗ - 4
Miyasaka LS, et al.. Valerian for anxiety disorders.. The Cochrane database of systematic reviews. 2006.
Strong EvidencePubMed ↗