Valerian Root Blood Pressure: What the Evidence Shows
Valerian root shows up in sleep formulas, calming teas, and nighttime metabolism blends, and a common search is whether it does anything to blood pressure. The short version is that the question comes from an assumption about relaxation rather than from blood pressure data.
Here is what the human trials on valerian root measured, why the blood pressure idea keeps circulating, and the cautions worth knowing if you already monitor your numbers.
Valerian root blood pressure claims are not supported by reliable human evidence, and valerian root should not be used for that purpose. The clinical research on valerian root is built around subjective sleep quality and feelings of stress, not blood pressure readings. A 2020 systematic review pooled 60 studies in 6,894 people and analyzed sleep quality and anxiety outcomes, not cardiovascular endpoints [1]. Older controlled trials in healthy volunteers measured perceived sleep latency and wake time after sleep onset [2]. A four-week randomized, placebo-controlled trial in 64 volunteers under psychological stress measured EEG brain connectivity [3]. None of these were designed as blood pressure studies.
Blood pressure is a clinical measurement, and it belongs with your healthcare professional. A dietary supplement is not a substitute for prescribed care, and supplements are not FDA-approved [4]. If you take blood pressure medication, sedatives, or any daily prescription, talk with a healthcare professional before adding valerian root, especially if you are pregnant, nursing, under 18, or managing a health condition [4].
What does valerian root research actually measure?
Valerian (Valeriana officinalis) is one of the most studied herbal ingredients in the sleep category, and almost all of that work sits in one lane: how people rate their own sleep and calm.
The main outcomes in the trials
- Perceived sleep latency and night waking. In a classic controlled study of healthy young adults, an aqueous valerian root extract taken at home reduced perceived sleep latency and wake time after sleep onset, while laboratory polygraph recordings showed no significant differences from placebo [2].
- Subjective sleep quality. A second early trial reported improved self-rated sleep quality with an aqueous valerian root extract [5].
- Pooled sleep and anxiety scores. The 2020 systematic review and meta-analysis ran separate analyses on subjective sleep quality (10 studies, 1,065 participants) and anxiety scales (8 studies, 535 participants) [1].
- Brain activity. The EEG trial in stressed volunteers found greater increases in frontal alpha coherence with 100 mg of valerian root extract taken three times daily compared with placebo, though both groups improved on the clinical scales [3].
Notice what is missing from that list. Systolic and diastolic readings, 24-hour heart rate, and clinic blood pressure endpoints are not the outcomes these studies collected. A broader network meta-analysis in adults with poor sleep also focused on sleep quality, tolerability, and adverse events rather than cardiovascular measures [6].
The honest summary: the evidence base for valerian root is about sleep and relaxation, and it is inconsistent even there, which the reviewers attributed partly to variable extract quality [1].
Why do people connect valerian root with blood pressure?
The idea usually travels by logic rather than by data. Valerian root is used as a calming herb, stress and poor sleep are talked about alongside cardiovascular health, and people connect the dots on their own.
The relaxation assumption
Valerian root is the most commonly used herbal supplement for sedation, and the EEG trial reported that it changes resting-state brain connectivity in ways the authors linked to calming effects [3]. From there it is a short jump to assuming any calming ingredient must move a blood pressure reading. That jump is not supported by the trials in this evidence base.
The GABA connection
Valerian is often discussed alongside gamma-aminobutyric acid because both are framed as calming. A separate randomized, placebo-controlled trial gave 200 mg of GABA daily for 90 days to 30 sedentary women with overweight or obesity who were also exercising, and reported improvements in habitual sleep efficiency on the Pittsburgh Sleep Quality Index along with changes in heart-rate variability [7]. Heart-rate variability is a measure of autonomic balance, not a blood pressure reading, and that study looked at GABA, not valerian root.
Why the distinction matters
A supplement that helps you wind down in the evening is doing something different from a medication your clinician prescribed. Treating them as interchangeable is how people end up skipping prescribed care. If blood pressure is your concern, track it with your clinician and keep supplements in the supporting-cast role they belong in [4].
Does valerian root tea affect blood pressure?
Tea does not change the answer. There is no reliable human evidence that valerian root tea changes blood pressure readings, and the tea format actually makes the picture murkier, not clearer.
Dose is unpredictable in a cup
The trials used standardized extracts at defined amounts, such as 450 and 900 mg of an aqueous extract in the home-sleep study and 600 mg of a native root extract taken in the evening in the alertness trial [2][8]. A homemade infusion delivers an unknown amount of whatever compounds steeped out of the root that night. The 2020 review specifically flagged variable quality of herbal extracts as a likely reason clinical outcomes have been inconsistent, and suggested more reliable effects from whole root and rhizome preparations [1].
What tea can reasonably support
A warm herbal drink as part of an evening wind-down is a sensible habit, and valerian root is commonly used for sleep support in that context [1]. Frame it that way rather than as anything acting on a blood pressure reading.
One caution for tea drinkers
Valerian root tea is still an active herbal preparation. If you already take a sedating medication or a daily prescription, the route of delivery does not remove the need to check with a healthcare professional first [4]. And if you use a home cuff, day-to-day changes you see are far more likely to reflect sleep, sodium, stress, alcohol, training load, and medication timing than a cup of tea.
Is valerian root safe if you have high blood pressure or take medication?
This is the practical question behind most searches, and it deserves a plain answer: it is a conversation for your healthcare professional, not something to decide from a blog post.
What the tolerability data show
The 2020 systematic review reported no severe adverse events associated with valerian intake across subjects aged 7 to 80 [1]. A randomized, double-blind trial in 102 volunteers found that neither a single evening dose nor 14 days of evening dosing with 600 mg of valerian root extract had a relevant negative impact on next-morning reaction time, alertness, or concentration [8]. Tolerability, adverse events, and dropout due to side effects are standard outcomes in reviews of sleep-related interventions in adults, and they belong in any honest read of an ingredient [6].
Who should be careful or skip it
- Anyone taking blood pressure medication, sedatives, sleep medication, or any daily prescription, because interactions are the main concern with herbal sleep ingredients [4]
- Anyone pregnant or nursing
- Anyone under 18
- Anyone scheduled for surgery or anesthesia in the near term
- Anyone combining it with alcohol or other sedating substances
A note on expectations
Supplements are not FDA-approved, and no supplement is a substitute for monitoring or for medication your clinician has prescribed [4]. Talk with a healthcare professional before starting any supplement, especially if you are pregnant, nursing, under 18, taking medication, or managing a health condition.
Where does valerian root actually fit in a nighttime routine?
If blood pressure is not the reason to use valerian root, sleep support is the reason most formulas include it. That is also where it sits in a nighttime stack.
DreamSlim pairs restful sleep support with overnight metabolism support, using melatonin, valerian root, GABA, white kidney bean extract, green coffee bean extract, and CLA. The label serving is 2 capsules 30 minutes before bed. It is made in the USA in an FDA-registered, GMP-certified facility and third-party tested for purity and potency.
The melatonin caution
Each serving provides 4 mg of melatonin. Melatonin can cause drowsiness, so take it only when you are settling in for the night and do not drive or operate machinery after taking it [9]. Melatonin is not recommended without medical guidance during pregnancy or nursing, or for children [9]. In a meta-analysis of 23 randomized controlled trials, melatonin supplementation was associated with improved sleep quality scores on the Pittsburgh Sleep Quality Index in adults [10].
The caffeine caution
Green coffee bean extract comes from an unroasted coffee bean and can contain caffeine. The product page does not list a caffeine amount per serving, so read the label and count your total daily intake from all sources. Anyone sensitive to caffeine, anyone pregnant or nursing, anyone under 18, and anyone who trains in the evening should limit or avoid caffeine [4].
The metabolism side
White kidney bean extract has been studied as an adjunct within a calorie-controlled diet. A meta-analysis of 8 randomized controlled trials in 543 adults with overweight or obesity reported reductions in weight, BMI, fat mass, and waist circumference compared with placebo, with no serious adverse events reported [11]. Any support like that works alongside a sensible diet and consistent training, not instead of them. You can see the rest of the metabolism and energy lineup if that is the goal you are building around.
Frequently asked questions
Can I take valerian root with high blood pressure?
Ask your healthcare professional first, especially if you take blood pressure medication or any other daily prescription, since interactions are the main concern with herbal sleep ingredients [4]. Valerian root has not been studied as a blood pressure ingredient, and a supplement is never a substitute for prescribed care or monitoring. Reviews of valerian trials reported no severe adverse events in participants aged 7 to 80, but that is general tolerability, not clearance for your situation [1].
Does valerian root tea affect blood pressure?
No reliable human evidence supports that. The trials on valerian root used standardized extracts, such as 450 to 900 mg of an aqueous extract, and measured perceived sleep latency and sleep quality rather than blood pressure [2]. A homemade infusion also delivers an unpredictable dose, and reviewers linked inconsistent results partly to variable extract quality [1]. Treat valerian tea as part of an evening wind-down, not as anything acting on a reading.
How quickly does valerian root work?
That is covered in a separate article. In brief, the trials dosed it in the evening and measured self-reported sleep the same night or over one to four weeks of use [2][3].
Does valerian root make you groggy the next morning?
In a randomized, double-blind trial of 102 volunteers, 600 mg of valerian root extract taken in the evening, either once or for 14 days, did not have a relevant negative impact on next-morning reaction time, alertness, or concentration compared with placebo [8]. Individual responses still vary. If a nighttime formula also contains melatonin, expect drowsiness and avoid driving after taking it [9].
Key takeaways
- Human trials on valerian root measured subjective sleep quality and anxiety scales, not blood pressure readings [1].
- The blood pressure idea comes from valerian's reputation as a calming herb, not from cardiovascular data [3].
- Valerian root tea carries the same lack of blood pressure evidence, plus an unpredictable dose compared with standardized extracts [2].
- Reviews reported no severe adverse events with valerian in subjects aged 7 to 80, but interactions with medication are the real caution [1][4].
- Supplements are not FDA-approved and are not a substitute for prescribed care or monitoring; check with a healthcare professional first [4].
If your goal is a calmer evening routine with valerian root, melatonin, and GABA alongside overnight metabolism support, take a look at DreamSlim – Nighttime Metabolism & Sleep Support and read the label before you decide.
References
- Valerian Root in Treating Sleep Problems and Associated Disorders-A Systematic Review and Meta-Analysis. Journal of evidence-based integrative medicine (2020). PubMed 33086877
- Effect of valerian on human sleep. Psychopharmacology (1985). PubMed 3936097
- Valerian extract alters functional brain connectivity: A randomized double-blind placebo-controlled trial. Phytotherapy research : PTR (2019). PubMed 30632220
- MedlinePlus: Dietary Supplements. medlineplus.gov
- Aqueous extract of valerian root (Valeriana officinalis L.) improves sleep quality in man. Pharmacology, biochemistry, and behavior (1982). PubMed 7122669
- Comparative effects of pharmacological interventions for the acute and long-term management of insomnia disorder in adults: a systematic review and network meta-analysis. Lancet (London, England) (2022). PubMed 35843245
- GABA Supplementation, Increased Heart-Rate Variability, Emotional Response, Sleep Efficiency and Reduced Depression in Sedentary Overweight Women Undergoing Physical Exercise: Placebo-Controlled, Randomized Clinical Trial. Journal of dietary supplements (2024). PubMed 38321713
- The influence of valerian treatment on "reaction time, alertness and concentration" in volunteers. Pharmacopsychiatry (1999). PubMed 10599933
- NIH National Center for Complementary and Integrative Health: Melatonin — What You Need To Know. www.nccih.nih.gov
- Effect of melatonin supplementation on sleep quality: a systematic review and meta-analysis of randomized controlled trials. Journal of neurology (2022). PubMed 33417003
- White kidney bean extract reduces body weight and adiposity with acceptable safety in adults with overweight and obese: a systematic review and meta-analysis. Nutrition research (New York, N.Y.) (2026). PubMed 42066439
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. This article is for informational and educational purposes only and is not medical advice. Dietary supplements are not a substitute for a balanced diet, training, or sleep. Talk with a qualified healthcare professional before starting any supplement, especially if you are pregnant, nursing, under 18, taking medication, or managing a health condition.