Valerian root is most commonly used to help with sleep, though people also take it for anxiety and restlessness
Valerian root comes from the root of the Valeriana officinalis plant, native to Europe and Asia. It has been used in traditional medicine for centuries, and today it is one of the most studied herbal remedies for sleep problems. The root contains compounds—including valerenic acid and several amino acids—that appear to interact with the brain in ways that may calm activity and promote drowsiness.
Most people who use valerian root take it as a dried powder in capsules, as a liquid extract, or brewed as a tea. The taste is earthy and somewhat bitter, which is why capsules are popular. Unlike prescription sleep medications, valerian root is available without a doctor's order at most pharmacies, health food stores, and online retailers.
Key Takeaways
- Valerian root is most studied for its effect on sleep onset and sleep quality, with research showing mixed but generally positive results.
- People also use valerian root for anxiety and general restlessness, though fewer studies examine these uses.
- Effects typically take one to two weeks of regular use to become noticeable, not hours like prescription sleep aids.
- Valerian root can interact with certain medications and may cause drowsiness the next day in some people.
How valerian root may affect sleep
The most common reason people turn to valerian root is trouble falling asleep or staying asleep. Research published in medical journals shows that people taking valerian root often report falling asleep faster and sleeping more deeply than when they took a placebo—a fake pill with no active ingredient. However, the effect is usually modest rather than dramatic, and results vary from person to person.
One reason the research is mixed is that valerian root studies are difficult to run. The herb has a strong smell and taste, so people can usually tell whether they are taking the real thing or a placebo, which can influence how they perceive their sleep. Additionally, the strength of valerian root products varies widely depending on how they are made and stored, making it hard to compare studies fairly.
Most people who find valerian root helpful report that it works best when taken regularly for at least one to two weeks, not as a one-time dose before bed. This is different from prescription sleep medications, which often work the first night you take them.
Valerian root for anxiety and daytime restlessness
Beyond sleep, some people use valerian root to manage anxiety or a general sense of nervousness during the day. The logic is similar: if the compounds in valerian root calm brain activity at night, they may do the same during waking hours. However, far fewer studies have examined this use, and the evidence is weaker than it is for sleep.
People who report benefit for anxiety typically take smaller doses during the day and larger doses at night. Because valerian root can cause drowsiness, daytime use is not suitable for everyone—particularly those who drive, operate machinery, or need to stay alert for work.
Common side effects and what to expect
Valerian root is generally well tolerated, meaning most people who take it experience no problems. However, some people do report side effects, particularly when first starting the herb or when taking higher doses.
The most common side effect is drowsiness or grogginess the morning after taking valerian root, especially if taken in larger amounts. Some people report vivid or unusual dreams. Less commonly, people experience headache, dizziness, or an upset stomach. A small number of people report the opposite effect—feeling more awake or jittery—though this is rare.
Side effects often decrease after the first week or two as the body adjusts. If drowsiness is a problem, taking valerian root earlier in the evening or reducing the dose may help.
Interactions with medications and health conditions
Valerian root can interact with certain medications, particularly those that also cause drowsiness. These include prescription sleep aids, anti-anxiety medications, antidepressants, and pain relievers like codeine. If you take any of these, talk with a pharmacist or doctor before adding valerian root, as combining them could make you too drowsy or cause other unexpected effects.
Valerian root may also interact with medications broken down by the liver, including some blood thinners and heart medications. People with liver disease should check with a healthcare provider before use. Additionally, valerian root should not be combined with alcohol, as both depress the central nervous system.
Pregnant and breastfeeding people should avoid valerian root, as there is not enough research on its safety in these situations. People with a history of liver problems should also be cautious.
How much valerian root people typically take
Dosing varies widely depending on the form and the reason for use. For sleep, common doses range from 400 to 900 milligrams taken 30 minutes to two hours before bed. For anxiety during the day, people often take smaller doses of 100 to 200 milligrams, sometimes split across two or three times daily.
The problem is that products are not standardized the way prescription medications are. Two bottles labeled "valerian root 500 mg" may contain different amounts of the active compounds, depending on how the plant material was processed and stored. This is why starting with a lower dose and adjusting based on your response is often recommended.
Because effects build over time rather than appearing when ready, it is worth giving valerian root at least one to two weeks before deciding whether it is working for you.
Valerian root compared to other sleep and calming options
Valerian root is one option among many for people seeking help with sleep or anxiety. Other herbal remedies in the same category include passionflower, chamomile, and magnesium. Prescription sleep aids work faster and more reliably but carry a higher risk of dependence and side effects. Behavioral approaches—like keeping a consistent sleep schedule, limiting screen time before bed, and practicing relaxation techniques—have strong research support and no side effects, though they require more effort upfront.
Many people use valerian root alongside these other approaches rather than as a replacement. For example, someone might take valerian root at night while also working on sleep hygiene habits during the day. A healthcare provider or sleep specialist can help you think through which combination makes sense for your situation.
Frequently Asked Questions
How long does it take for valerian root to work?
Most people do not notice effects from a single dose. Instead, valerian root typically requires one to two weeks of regular use before sleep or anxiety changes become noticeable. Some people need three to four weeks. This is very different from prescription sleep aids, which often work the first night.
Is valerian root safe to take every night?
Short-term nightly use appears safe for most people based on available research. However, long-term safety—taking it every night for months or years—has not been studied thoroughly. If you are considering regular use beyond a few weeks, discuss it with a healthcare provider to make sure it is appropriate for your situation.
Can valerian root cause dependence or withdrawal?
Unlike prescription sleep medications, valerian root does not appear to cause physical dependence or withdrawal symptoms when stopped. However, if you have been using it regularly and stop suddenly, your original sleep problems may return. Tapering off gradually rather than stopping abruptly is generally recommended.
Does valerian root interact with birth control?
There is no strong evidence that valerian root reduces the effectiveness of birth control pills. However, research is limited. If you take birth control and are considering valerian root, a pharmacist can review your specific medications to check for any known interactions.
What is the difference between valerian root and valerian extract?
Valerian root refers to the dried, powdered form of the plant root, usually sold in capsules. Valerian extract is a concentrated liquid form made by soaking the root in alcohol or water and removing the liquid. Extracts are typically stronger per dose than powdered root, so dosing is different. Both forms are available, and which one works better varies by person.