Health note: This guide is for learning. It is not intended to constitute medical advice, and it can’t replace your doctor. Always consult a healthcare provider before you start something new.
You took the herb yesterday. Today you feel the same. So is it working?
How long does it take for herbal remedies to work? It depends on the herb, the form, and the health problem.
A few herbs are felt within minutes. Others need weeks or months. Some have no proven timeline at all, because research has not shown they help.
We sorted herbs into simple time zones and checked what real studies measured. You’ll also get a plan for when to stop and call a health professional. It’s written for anyone new to herbal medicine, or anyone who wonders if their herbal supplement is doing anything.
Quick Answer
Herbal remedies work on different schedules, so how long herbal remedies take to work depends on the herb. Ginger and bitters may be felt within minutes to hours, according to herbalists. Herbs for mood or sleep are usually studied over two to twelve weeks. A few, like ginkgo biloba, have no proven time frame.
Key Facts
- Minutes to hours: some herbs for the stomach. These are herbalist reports, not trial results.
- Two to six weeks: valerian and kava may need about this long (limited evidence).
- Four to eight weeks: how long most St. John’s wort studies ran for mild to moderate depression.
- No proven time: ginkgo biloba, because large studies found no clear benefit.
- Safety first: talk to a healthcare provider if you take prescription medicines.
What Is Herbal Medicine? Herbs, Extracts, and Supplements
Herbal medicine means using plants, or parts of plants, to support general health or treat illness. The use of herbal medicine goes back a long way, since herbs have been used for thousands of years. Traditional Chinese medicine is one well-known example. Today, many herbal products in stores are sold as a dietary supplement, according to NCCIH.
Herb, Remedy, Extract: What’s the Difference?
An herb is a plant used for its taste, smell, or health effects. A remedy is anything you use to ease a health problem. So an herbal remedy is a plant used that way. “Natural remedies” is just another name for the same idea.
An herbal extract is made by soaking the herb in a liquid, such as alcohol or water, to pull out its active parts. Companies then sell these herbal preparations as drops, capsules, or tablets.
An herbal supplement is a pill, capsule, or powder that you swallow. You may also see the words food supplements, medicinal products, or phytomedicines, which just means plant-based medicines. The rules for herbal products change with what’s in them and how they’re used.
In plain words: The herb is the plant. An extract is the plant soaked in liquid. A supplement is the pill or powder you swallow.
Fresh or Dried, Whole Herb or Extract
A whole herb, or whole plant, is the leaf, root, flower, or seed used as it is. You can use it fresh or dried, and dried flowers and leaves are often used to make tea. An extract keeps only some of the plant’s chemistry, often in a stronger dose.
The parts of the plant matter, too. Echinacea products, NCCIH notes, can come from the above-ground parts, the root, or both. Results from one product may not fit another.
Long use is a clue, not proof. Many herbs have been used for centuries, and that history is called traditional use. But many studies of Chinese herbal products were poor quality, according to NCCIH, so no firm conclusions can be made.
Once you know the form and the source, you can better judge how long herbal remedies take to work.
For a closer look at specific anti-inflammatory herbs and their timelines, see our guide to herbal remedies for inflammation
How Long It Takes for Herbal Remedies to Work: Three Time Zones
Herbs don’t follow one clock. It helps to sort them into three time zones: minutes to hours, days to weeks, and weeks to months. The zone depends on how the herb acts in the body and on the specific health problem you want it to help.
Zone 1: Minutes to Hours
Herbs that touch the stomach or the nerves can be felt fast. Kava, which is sold as an anti-anxiety herb, is a good example.
The herbalists at Herb Pharm report it is often felt in 10 to 20 minutes. Bitters, they add, start acting on digestion in about the same time, which is why people take them 10 to 15 minutes before a meal. These are herbalist reports with no trial cited, so treat them as traditional use.
That doesn’t match NCCIH, which notes kava may need several weeks to help anxiety. So which is right? Probably both, since feeling calmer soon after a dose isn’t the same as lasting relief. That’s our reading, not a study result.
Ginger is fast in folk medicine. It was traditionally used for upset stomach, and research suggests ginger may help with nausea in pregnancy. Most motion sickness studies haven’t shown a benefit, though.
Remember: Fast doesn’t mean proven, and slow doesn’t mean weak. Timing and evidence are two different questions.
Zone 2: Days to Weeks
In this middle zone, how long herbal remedies take to work runs from days to weeks. Some herbs for calm and immune support are said to work in a few days to a week. One herbalist’s guide puts lemon balm, skullcap, and echinacea in this group. That’s an herbalist claim, and research is thinner.
Valerian, per Mayo Clinic, seems to work best after two or more weeks of regular use. Still, the evidence for sleep is mixed, and a sleep medicine group advises against it for chronic insomnia.
Zone 3: Weeks to Months
How long it takes herbal remedies to work for mood and long-term health usually runs to weeks. St. John’s wort studies for depression lasted at least four weeks, and few ran past eight, according to a review on InformedHealth.org.
Herbal supplements may need several weeks before you notice a change. The same herbalist’s guide adds that slow herbs like nettle, ashwagandha, and hawthorn take weeks or even months. This is traditional use, not trial data.
For a first try, we’d say tea is a better pick than a strong extract for most beginners, because a weak dose is easier to stop if you feel unwell. That’s our view.
Herb Timeline Table: What the Studies Actually Measured
Most guides repeat what herbalists say. Few show how long real studies lasted. So we lined them up. This table compares how long herbal remedies take to work in claims and in studies.
“Claim” means a statement from an herbalist, seller, or health site. “Study length” means how long researchers watched people.
| Herb Used for Common claim Study length (research) Evidence label | ||||
|---|---|---|---|---|
| Kava | Anxiety | Felt in 10 to 20 minutes (Herb Pharm) | 6-week trial, 75 people; NCCIH says several weeks may be needed | Limited; rare liver injury |
| St. John’s wort | Mild to moderate depression | A few weeks (GoodRx) | At least 4 weeks; most under 8 | Better studied; many drug interactions |
| Valerian | Sleep | Best after 2+ weeks of regular use (Mayo Clinic) | Used up to 6 weeks at 300 to 600 mg daily | Mixed results |
| Echinacea | Colds | A few days to a week (herbalist blog) | 4-month trial, 755 people; 24 trials in a 2014 review | Weak or mixed |
| Ginkgo biloba | Memory and dementia risk | No timing found in our sources | 3,000+ adults aged 75 and up, median 6 years | No clear benefit found |
| Ginger | Nausea | Minutes to hours (herbalist blog) | No single length; many studies, some low quality | Limited; may help pregnancy nausea |
| Asian ginseng | Fatigue | No timing found in our sources | Review of 19 studies, 2,413 people | Small effect on general fatigue |
Sources: see References. We compiled this table ourselves.
What the Table Shows
Look at ginkgo. The trial ran about six years, yet it found no clear benefit. Waiting longer is not a proven fix.
Now look at kava. The claim is minutes, while the trial ran six weeks. Both can be true, because they measure different things.
Study length is not the same as time to feel better. It’s the time researchers chose to watch. Use the table to plan a check-in, not as a promise.
Why Some Herbs Work Faster Than Others
Two people can take the same herb and get different results. Why is that? It’s one reason how long herbal remedies take to work varies so much. Four things explain most of the gap: how the herb acts, the form you use, your health problem, and how steady you are.
How the Herb Acts in the Body
Herbs act through natural chemicals in the plant. Those effects are sometimes called actions in the body. Different chemicals do different jobs, and scientists haven’t mapped them all.
Bitters work through taste receptors, Herb Pharm explains, so their effect starts fast. Kava contains kava pyrones, but scientists still don’t fully know how it works, according to the LiverTox database.
Form Matters: Tea, Extract, or Capsule
Form changes speed and strength. Liquid herbal extracts are absorbed well and begin working quickly, Herb Pharm explains. It also points out that “noticeable” results vary a lot. A tea is gentler.
If you’d like a mild option at home, our guide to how to make chamomile tea at home shows how to brew fresh or dried flowers. One caution: NCCIH lists reported interactions between chamomile and warfarin, plus some liver-processed drugs. Check first if you take either.
Beginner tip: Note the herb, form, dose, and start date on your phone. It makes any check-in easier.
Your Body, Your Health Condition
Herbalists often say mild, short-term problems improve sooner than long-lasting ones. Sellers of Chinese herbs say mild issues can improve within days, while chronic conditions may need 4 to 12 weeks. No study is cited, so that’s a seller’s rule of thumb.
Herbalists also disagree. One herbalist argues that herbs work as fast as drugs for most everyday problems. Others say herbs work with your body and need time. The honest answer is that it varies.
Steady use also matters. Herbalists say a daily cup of tea beats a few days of big doses. That’s traditional advice, not a tested rule.
St. John’s Wort, Ginseng, Echinacea, and Ginkgo Biloba: What to Expect
These are some of the most popular herbal picks for common health concerns. Here’s how long it takes herbal remedies to work for each one.
St. John’s Wort (Hypericum)
St. John’s wort is a flowering plant, also called hypericum. It’s used to treat mild to moderate depression. A review of 35 studies with nearly 7,000 people found it beat a placebo for that group. It also did about as well as other antidepressants.
Those studies ran at least four weeks, so expect a few weeks before any change. It’s uncertain, per NCCIH, whether this holds for severe depression or over a longer period of time.
It has also been studied for menopausal hot flashes and premenstrual syndrome, but that research is small. The big catch is drug interactions. NCCIH rates the risk as high, including with warfarin and birth control pills.
GoodRx advises against combining it with conventional antidepressants, since that raises the risk of a serious problem called serotonin syndrome. Mayo Clinic also advises avoiding it in pregnancy.
Warning: St. John’s wort has a high risk of drug interactions. Talk to a pharmacist or provider before you start it.
Echinacea
A 2014 Cochrane review of 24 trials with 4,631 people, cited by NCCIH, found echinacea has not been shown to help treat colds. Another 4-month trial of 755 people found that a fresh-plant extract cut the number of colds. So the picture is mixed, and how long it takes herbal remedies to work here is hard to pin down. NCCIH summarizes that echinacea may slightly lower your chance of catching a cold, and it’s unclear if it shortens one.
You may see echinacea sold for antiviral properties. That’s a marketing claim, not a proven timeline. Some people are allergic to it, and one study in children linked it to more rashes.
Ginkgo Biloba
Ginkgo biloba, sometimes spelled gingko biloba, is a leaf extract. NCCIH finds no conclusive evidence that it helps any health condition. In one large study, more than 3,000 adults aged 75 and older took ginkgo or a placebo for a median of six years. Ginkgo did not lower the risk of dementia.
It’s also been used for cardiovascular problems, such as leg pain from poor blood flow. Yet large studies haven’t shown it helps, Mayo Clinic notes. Ginkgo may raise bleeding risk, especially with warfarin or ibuprofen.
Asian Ginseng
For ginseng, an NCCIH summary describes a 2023 review of 19 studies with 2,413 people. Ginseng alone may have a small benefit for general tiredness. We found no timeline in that summary, so we can’t say how fast it works. It’s also uncertain whether ginseng interacts with some blood pressure drugs, statins, and antidepressants.
Saw palmetto and other herbs aren’t covered here.
Using Herbal Products Safely While You Wait
While you wait to see how long herbal remedies take to work, safety comes first. “Natural” doesn’t mean risk-free. Research shows herbal products can carry the same kinds of dangers as other active compounds, NCCIH warns. Studies on the safety and effectiveness of many herbs are also still growing.
Herbs Can Interact With Medicines
Herbal remedies may interact with prescription medications. Some medicines interact with herbs in harmful ways, making a drug stronger or weaker. People who take drugs with a narrow safe range, like warfarin, digoxin, and cyclosporine, should take extra care, NCCIH advises.
Mayo Clinic adds that many herbal supplements interact with warfarin. Little is known about possible interactions for many supplements, too. So a lack of warnings doesn’t mean safe, whether you use conventional medicines or conventional drugs.
Quick rule: On prescription medicines? Ask your pharmacist before you start any herb, even a tea.
Who to Ask: Your Provider, Pharmacist, or Herbalist
If you’re considering taking herbal products, talk to a pharmacist or a healthcare provider before taking any herbal product, even a tea. NCCIH suggests you bring a written list of everything you take, how often, and the doses. Tell them about all the herbs you are taking, plus your medical history and any health conditions.
An herbalist or naturopathic practitioner can add guidance. It’s also smart to ask any healthcare practitioner or health practitioner about their training and experience. For general information on herbal products, NCCIH’s Herbs at a Glance pages are a good start.
Read Herbal Supplement Labels Closely
A supplement label is your first clue, but it isn’t proof. NSF International tests products to confirm that what’s on the label is in the bottle. It also checks for unlisted ingredients.
USP, short for the United States Pharmacopeia, runs a similar program. According to one journal review, both programs check identity, strength, and purity.
Both also look at good manufacturing practices, the rules for how supplements are made. A seal tells you what’s inside. It doesn’t tell you if the herb works. That’s our reading of what they test.
Label tip: A seal shows what’s in the bottle. It doesn’t show that the herb works.
Labels matter. Some Chinese herbal products have turned up with hidden drugs, heavy metals, and the wrong herbs, NCCIH reports.
When to Stop Taking an Herb
Stop taking the herb and call your provider if you get a rash, stomach pain, dizziness, or any new symptom. Do the same if your symptoms get worse.
Some people have negative side effects from taking herbal supplements, even ones sold as natural. NCCIH lists headache, nausea, and allergic skin reactions among ginkgo’s possible side effects. Kava has been linked to rare cases of serious liver injury, so it deserves extra care.
Don’t Self-Diagnose: When to Stop and Call a Provider
Please don’t self-diagnose and use an herb as the test. Low mood, poor sleep, and stomach pain can each have many causes.
GoodRx cautions against treating depression on your own with St. John’s wort. And depression means feeling very down for at least two weeks, plus other signs like low energy, per InformedHealth.org.
Does that sound like you? See a provider before you start an herb. Should you ever feel unsafe, call or text 988 in the U.S. right away.
A Simple Check-In Plan
Use this plan to see how long herbal remedies take to work for you, with any herb your provider approves. This is our suggestion, based on how long most studies ran. It is not a medical rule.
| When and What to do | |
|---|---|
| Days 1 to 3 | Follow the label dose or your provider’s advice. Watch for side effects. |
| Weeks 1 to 2 | Write down changes in sleep, mood, or stomach each day. |
| Week 4 | Compare your notes to day one. Share them with your provider. If a certain herb hasn’t helped, ask what to do next. |
| Anytime | Feeling worse, new symptoms, or a new medicine? Stop and call. |
The Bottom Line: How Long Herbal Remedies Take to Work
The short answer is that it depends on the herb. Stomach herbs like ginger and bitters can be judged in a day or so. Herbs used for mood, sleep, or long-term health call for several weeks of steady use, with your provider in the loop. And for herbs with no proven benefit, like ginkgo biloba, more time is not a proven fix.
One limit to keep in mind: many timelines in this guide come from herbalists and sellers, not trials. The safest plan is short. Follow the label, keep notes, check in at four weeks, and stop if you feel worse.
In one line: Judge stomach herbs in a day. Give mood and sleep herbs several weeks, with your provider in the loop.
Frequently Asked Questions
How long does it take for herbal supplements to work?
Herbs sold for mood, sleep, or long-term health are usually studied for two to twelve weeks. A few stomach herbs may be felt in minutes to hours. Some, like ginkgo biloba, have no proven timeline.
Do herbal extracts work faster than tea?
Often, yes. Liquid herbal extracts are absorbed well and begin working quickly, while tea is milder. Faster isn’t always better, so follow the label.
How long should I wait before I decide an herbal remedy isn’t working?
There’s no single rule. Many studies ran for about four weeks, so that’s a fair time to check in with your provider. Call sooner if you feel worse.
Can I take herbal remedies with prescription medicines?
Not without asking first. Herbal remedies may interact with prescription medicines, and St. John’s wort and ginkgo are well-known examples. Ask your pharmacist first.
Does St. John’s wort work as fast as an antidepressant?
In studies of mild to moderate depression, it did about as well as other antidepressants, and it usually takes a few weeks to start working. Don’t mix it with an antidepressant on your own. Talk to your provider first.
Next Steps
Now that you know how long herbal remedies take to work, match your herb to its time zone, keep notes, and check in with a health professional. If you’d like a gentle first herb, read our guide on how to make chamomile tea. Just ask your pharmacist first if you take warfarin.
Disclaimer: This article is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare professional before using medicinal herbs, especially if you are pregnant, nursing, taking medications, or have a medical condition. Read our full Medical Disclaimer.
References
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- St. John’s Wort: Usefulness and Safety
- org. Can St. John’s wort products help relieve depression?
- Mayo Clinic. John’s wort
- Ginkgo: Usefulness and Safety
- The Common Cold and Complementary Health Approaches: What the Science Says
- Echinacea
- Jawad M, et al. Safety and Efficacy Profile of Echinacea purpurea to Prevent Common Cold Episodes. Evidence-Based Complementary and Alternative Medicine, 2012.
- Valerian: Usefulness and Safety
- Mayo Clinic. Valerian: A safe and effective herbal sleep aid?
- Kava: Usefulness and Safety
- Anxiety and Complementary Health Approaches: What the Science Says
- LiverTox, NIDDK. Kava Kava
- Ginger
- Herb Pharm. How long does it take an herbal extract to work?
- Traditional Chinese Medicine: What You Need To Know
- Herb-Drug Interactions: What the Science Says
- Dietary Supplement and Vitamin Certification
- Journal of the Academy of Nutrition and Dietetics. Quality Certification Programs for Dietary Supplements
Written by cskoch, who researches medicinal plants and herbal wellness at Herbal Daily Care. This guide is research-based: we reviewed published trials, meta-analyses, and the manufacturer’s own sales page. We did not purchase or test the product, and we do not claim first-hand results.
