Ashwagandha and L-Theanine: Can You Take Them Together?
Yes, most healthy adults can take ashwagandha and L-theanine together. They are commonly sold in the same product, there is no known interaction between them, and they do different jobs on different timelines. Each one has its own research behind it, and pairing them is about covering different ground, not doubling up.
By Daniel Yoder, Yoder's Organics. Last updated 26 September 2026.
We get asked this several times a month, usually by someone who already has one of our jars and is holding a bottle of something else. So here is the plain version: what each ingredient actually does, what the research found, how to take them, and who should check with a doctor first.
L-theanine works the same day. Ashwagandha takes weeks.
That one sentence explains why they get paired, and it is the thing most people get wrong.
What L-theanine is
L-theanine is an amino acid found almost entirely in tea leaves. It is part of why a cup of green tea feels steady rather than sharp, even though tea has caffeine in it.
Two studies come up most often:
- A single-session study. In a 2007 study in Biological Psychology, twelve adults took L-theanine or a placebo before a stressful mental arithmetic task. With L-theanine, their heart rate and a saliva marker of stress rose less during the task than with placebo.
- A four-week study. In a randomised controlled trial published in Nutrients, thirty healthy adults took 200 mg of L-theanine a day for four weeks. Against placebo, they reported lower scores on stress-related questionnaires, better sleep quality scores, and did better on some verbal fluency tasks.
Both were small, and both point the same way.
What ashwagandha is
Ashwagandha (Withania somnifera) is a shrub whose root has been used in Ayurvedic practice for a very long time. Nearly all the modern research uses concentrated root extract:
- In a 60 day placebo-controlled trial, 64 adults with a history of chronic stress took a high-concentration root extract every day. Against placebo, they scored lower on stress questionnaires and had lower blood cortisol at day 60.
- In an eight week trial published in Cureus, 60 stressed but otherwise healthy adults took ashwagandha root extract or a placebo every day. The ashwagandha groups reported lower perceived stress and better sleep quality scores.
Look at the timelines. Sixty days. Eight weeks. Researchers measured after weeks of daily use, so that is the fair way to judge it. Anyone promising you something in three days is selling you something.
Ashwagandha vs L-theanine at a glance
| L-theanine | Ashwagandha | |
|---|---|---|
| What it is | Amino acid | Herb, root extract |
| Comes from | Tea leaves | Withania somnifera root |
| How it was taken in the studies above | 200 mg a day | Root extract, every day |
| How long the studies ran | One session, and 4 weeks | 8 weeks, and 60 days |
| Why people take it | Calm, clear focus during the day | Everyday stress, over time |
| Main cautions | Generally well tolerated. Ask a doctor if you take blood pressure or sedative medication | Not during pregnancy or breastfeeding. Rare liver injury reports. Thyroid, sedative and immune medications |
Why they get paired
Because they cover different ground. L-theanine is associated with feeling relaxed but alert, and people often notice it the same day. Ashwagandha is something you take consistently and judge after a month or two.
Put together, the idea is a steadier day without the heavy, drowsy feeling some calming products leave you with. That is why our gummy has both, and it is why you will find the pair in a lot of products on the shelf.
How to take them together
- If you are new to both, start with one. Take it for a week, then add the other. If something does not agree with you, you will know which one it was.
- Pick a time and keep it. Morning or early afternoon suits most people who want daytime focus. If ashwagandha leaves you feeling relaxed, move it to the evening.
- Give it four to eight weeks. That is how ashwagandha was studied. Judging it after five days is judging nothing.
- Do not stack calming products. Sleep aids, sedating antihistamines and alcohol on top of this is a conversation to have with a doctor first.
- Stick to the serving on the label. More is not better with herbal extracts.
What should you not take with ashwagandha?
This is the question we would rather you read than skip. Talk to your doctor or pharmacist before taking ashwagandha if you:
- Are pregnant, trying to become pregnant, or breastfeeding
- Take thyroid medication. Ashwagandha can affect thyroid hormone levels
- Take sedatives, sleep medication, or benzodiazepines
- Take medication that suppresses the immune system
- Have a liver condition. Rare cases of liver injury linked to ashwagandha supplements have been reported
- Have an autoimmune condition
- Have surgery coming up
- Are under 18
Stop taking it and call a doctor if you notice yellowing of the skin or eyes, dark urine, unusual itching, or nausea that will not go away.
For a broader overview, the NIH Office of Dietary Supplements and NCCIH both publish plain summaries worth reading.
What is actually in our gummies
Worth being specific, since most labels are not. Each gummy has 225 mg of ashwagandha and 200 mg of L-theanine. That 200 mg is the same daily amount used in the L-theanine study above, which is unusual: plenty of products put a recognisable ingredient on the front of the jar in an amount far below anything that has been tested. You can check ours against the research yourself, which is the whole point of printing it.
Our family makes these by hand in Holmes County, Ohio, about 200 jars at a time, in our own facility, and every batch is third-party tested before it ships.
| Per 1 gummy | Amount |
|---|---|
| Ashwagandha | 225 mg |
| L-theanine | 200 mg |
| Vitamin B6 | 1.7 mg |
| Vitamin D3 | 25 mcg |
| Vitamin B12 | 50 mcg |
| Zinc | 30 mg |
| Gummies per jar | 30, a one month supply at one a day |
| Flavour | Peach mango citrus |
| Gluten free | Yes |
| Third-party tested | Every batch |
What you get is the same L-theanine amount the research used, alongside a daily dose of ashwagandha root, in something you will remember to take every day, which is the part most people struggle with.
Serving: one gummy a day, morning or afternoon, with or without food.
Our Ashwagandha + L-Theanine Gummies come with a 60 day money-back guarantee, even if the jar is empty, and sit in our calm and focus line.
Frequently asked questions
Is it better to take ashwagandha and L-theanine in the morning or at night?
Morning or early afternoon suits most people, because both are usually taken for calm, clear focus during the day rather than for sleep. If ashwagandha makes you feel relaxed or a little tired, move it to the evening. Consistency matters more than the hour.
Will the combination make me sleepy?
Most people do not feel drowsy. L-theanine is associated with a calm but alert state rather than sedation. Some people do feel relaxed in the first week or two of ashwagandha. If that is you, take it in the evening instead.
How long until I notice anything?
L-theanine has been studied within a single session, so some people notice something the same day. Ashwagandha was studied over eight weeks. Give it at least four weeks of daily use before you decide.
Can I take them with coffee?
Generally yes. L-theanine and caffeine occur together naturally in tea, and people often pair them deliberately. If coffee makes you jittery, that pairing is a common approach. Check with your doctor if you are sensitive to caffeine or have a heart condition.
Can I take them with magnesium?
There is no known interaction between the three, and plenty of evening routines include all of them. If you take magnesium as a prescribed medication, or you have kidney problems, ask your doctor first.
Is it safe to take every day?
The ashwagandha studies ran about eight weeks and the L-theanine studies about four, with side effects generally mild. Long-term data is limited. If you plan to take it for months, mention it at your next appointment, particularly if you take other medication.
Anything we have not covered here is probably answered in our frequently asked questions.
Sources
- Kimura K, Ozeki M, Juneja LR, Ohira H. L-Theanine reduces psychological and physiological stress responses. Biological Psychology. 2007;74(1):39-45. doi:10.1016/j.biopsycho.2006.06.006
- Hidese S, Ogawa S, Ota M, et al. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. Nutrients. 2019;11(10):2362. doi:10.3390/nu11102362
- Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine. 2012;34(3):255-262. doi:10.4103/0253-7176.106022
- Salve J, Pate S, Debnath K, Langade D. Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults. Cureus. 2019;11(12):e6466. doi:10.7759/cureus.6466
- Björnsson HK, Björnsson ES, Avula B, et al. Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network. Liver International. 2020;40(4):825-829. doi:10.1111/liv.14393
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 general information, not medical advice.