The short version
- A 2024 umbrella review of eight systematic reviews found no evidence of valerian's efficacy for treating insomnia, while noting it does appear to improve subjective sleep quality and has a good safety profile.
- A meta-analysis of 14 randomised trials in 1,602 people with insomnia found no statistically significant difference between any herbal medicine and placebo on any of thirteen efficacy measures.
- That same meta-analysis reported a greater number of adverse events per person with valerian than with placebo, unlike kava, chamomile and wuling.
- A review of 60 studies in 6,894 participants argued the inconsistent results stem from variable herbal extract quality, and that whole root and rhizome preparations give more reliable effects.
- LUVO's UNWIND contains 150 mg of valerian extract; on this evidence it is the ingredient in that formula with the weakest objective support.
Valerian has been sold as a sleep aid for longer than most countries have had drug regulators. It is on our shelf too. And when researchers went looking for the evidence underneath it, what they found was a herb that people reliably report helps, and instruments reliably fail to confirm.
The umbrella review
Valente and colleagues published the cleanest summary in European Neuropsychopharmacology in 2024. They searched six databases for systematic reviews of valerian for sleep disturbance, retrieved 70 records, and found eight eligible for analysis. Their conclusions, in their own framing: valerian has a good safety profile; the results showed no evidence of efficacy for the treatment of insomnia; and valerian appears effective for subjective improvement of sleep quality, although its effectiveness has not been demonstrated with quantitative or objective measurements.
They also note, pointedly, that despite widespread use and prescription by general practitioners and psychiatrists, valerian does not have empirical support for insomnia, and that the existing studies are heterogeneous and of low methodological quality.
Leach and Page reached the same place from a different direction in Sleep Medicine Reviews. Fourteen randomised controlled trials, 1,602 participants with insomnia, four herbal monopreparations including valerian. There was no statistically significant difference between any herbal medicine and placebo, or any herbal medicine and active control, on any of thirteen measures of clinical efficacy. And a detail that rarely makes it into marketing copy: while kava, chamomile and wuling produced a similar or smaller number of adverse events per person than placebo, a greater number of events per person were reported with valerian.
The case for the defence
The most sympathetic review is Shinjyo and colleagues in the Journal of Evidence-Based Integrative Medicine — 60 studies, 6,894 participants, with meta-analyses on subjective sleep quality across 10 studies in 1,065 people and on anxiety across 8 studies in 535 people. Their explanation for the inconsistency is specific and, we think, the most useful idea in this whole literature: the outcomes vary because the quality of the herbal extract varies. They argue more reliable effects come from whole root and rhizome preparations, that some active constituents are unstable, and that standardisation and shelf life need revisiting. They found no severe adverse events in subjects aged 7 to 80.
So one plausible story is not "valerian does nothing" but "valerian is a botanical with unstable actives, sold in wildly variable preparations, tested in low-quality trials, and the noise has swamped whatever signal exists." That story is not proven either. It is just more interesting than the shrug.
Why we are telling you this about our own product
UNWIND contains 150 mg of valerian extract, alongside chamomile, GABA, L-tryptophan, lemon balm, passion flower and 2 mg of melatonin. We are not going to stand here and tell you the valerian in it is the reason anyone sleeps. Based on the evidence above, the honest position is that valerian is the ingredient in that formula with the weakest objective support, and the melatonin is the ingredient with a clearer, if modest, mechanism behind it.
If you take UNWIND and it helps, we are not going to tell you that you are imagining it either. Subjective sleep quality is a real outcome that people live inside, and the umbrella review found valerian moves it. It just does not move a polysomnograph, and you deserve to know which of those two things you are buying.
The safety footnote nobody puts on the front
Valerian is broadly safe, and the reviews agree on that. Two caveats are worth carrying. Leach and Page found a higher rate of adverse events per person with valerian than with placebo, which is a mild but real asymmetry. And valerian is frequently taken alongside other sedating things — a nightcap being the common one — where the interaction is not well characterised. Anyone on prescription sedatives, or pregnant, or managing a liver condition, should ask a clinician before adding it rather than after.
What we'd actually tell you
If you want to try valerian, try it knowing what class of evidence you are joining: consistent self-reported benefit, no objective confirmation, and a real possibility that the specific preparation matters more than the dose. Tart cherry juice sits in the same class, and we say the same thing about that one. Buy whole root or rhizome preparations from a brand that will tell you what is in them, and give it two weeks.
If it seems to help for a fortnight and then fades, resist the obvious conclusion. The question of why sleep supplements stop working has a more interesting answer than tolerance, and for a herb with this much subjective response in its data, it is the answer we would bet on.
If it does not work, do not escalate the dose in search of the effect. The trials give you no reason to think more will help, and the adverse-event signal, small as it is, points the other way. And if your sleep problem is chronic rather than occasional, valerian is not the intervention with the best odds — the behavioural treatment is, and it does not come in a capsule. We would rather you got that from us than from a disappointed review three months from now.
Good questions
Does valerian root actually work for sleep?
Not in any way an instrument can detect. A 2024 umbrella review of eight systematic reviews found no evidence of efficacy for insomnia, and a meta-analysis of 14 trials in 1,602 people found no significant difference from placebo on thirteen efficacy measures. What does show up consistently is improvement in subjective sleep quality. Whether that is worth your money is a fair question.
Is valerian safe to take every night?
Broadly yes, with two caveats. Reviews report a good safety profile and no severe adverse events across ages 7 to 80. But one meta-analysis found more adverse events per person with valerian than with placebo, and interactions with alcohol and prescription sedatives are not well characterised. If you are pregnant, on sedatives, or managing a liver condition, ask a clinician first.
Why do valerian studies disagree with each other?
The most credible explanation is the raw material. A review of 60 studies concluded the inconsistency reflects variable herbal extract quality, with some active constituents being chemically unstable, and argued whole root and rhizome preparations perform more reliably. Add low methodological quality across the trials and you get a literature where the noise may be swamping a real but small signal.
Should I take more valerian if the standard dose does nothing?
No. The trials give no reason to expect a larger dose to succeed where a normal one failed, and the one adverse-event signal in the literature points in the opposite direction. If two weeks at a sensible dose changes nothing, the useful conclusion is that valerian is not your answer, and escalating is just spending more to reach the same result.
Why does UNWIND contain valerian if the evidence is this weak?
Because it is a traditional sleep botanical people expect in a formula, and because it is safe. That is the honest answer, not a clinical one. UNWIND contains 150 mg of valerian extract alongside melatonin, chamomile, GABA, L-tryptophan, lemon balm and passion flower. If you are buying it, the melatonin has the clearer mechanism behind it, and we would rather say so.
Sources
- Valente V, Machado D, Jorge S, Drake CL, Marques DR. Does valerian work for insomnia? An umbrella review of the evidence. Eur Neuropsychopharmacol, 2024. View study
- Leach MJ, Page AT. Herbal medicine for insomnia: A systematic review and meta-analysis. Sleep Med Rev, 2015. View study
- Shinjyo N, Waddell G, Green J. Valerian Root in Treating Sleep Problems and Associated Disorders - A Systematic Review and Meta-Analysis. J Evid Based Integr Med, 2020. View study
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
