In the trials, ashwagandha was taken for eight to sixteen weeks, and measurements were only taken at the end of that period. The shortest trial ran sixty days. No study reports a result after a few days, so a week-one experience cannot be hung on the measurements.
That does not mean you feel nothing. It means no measurement exists that confirms the feeling.
How long does ashwagandha take to work in the trials?
The four most quoted trials all measure at a single point: the end. No interim measurements at one or two weeks have been published, so the build-up is unknown. What you see below is the duration, the dose and exactly what was measured.
| Study | Duration | Dose | What was measured |
|---|---|---|---|
| Chandrasekhar, 2012 | 60 days | 300 mg, twice daily | Serum cortisol and stress questionnaires |
| Wankhede, 2015 | 8 weeks | 300 mg, twice daily | 1RM, muscle size, testosterone, body fat |
| Sharma, 2018 | 8 weeks | 600 mg a day | TSH, T3 and T4 |
| Lopresti, 2019 | 8 weeks per period, 16 weeks total | 21 mg withanolide glycosides a day | Salivary hormones and questionnaires |
Eight weeks is the standard, then, not the exception.
Anyone concluding after ten days that it does not work has not really tested it. Nor has anyone concluding after three days that it does.
When is the best time to take ashwagandha?
The trials that found an effect mostly split the dose across two moments, morning and evening. That is the only pointer that comes from research. The advice you read online about evening dosing for sleep does not come from a comparative study.
No trial has tested morning against evening in the same participants.
The thyroid study used a single 600 mg dose a day (Sharma, 2018) and also found an effect. Both schedules have been studied, just never against each other.
How much did participants take a day?
Most trials used 600 mg of root extract a day, whether given in one dose or two. The exception is the crossover study, which delivered 21 mg of withanolide glycosides a day (Lopresti, 2019).
That looks like an enormous gap, and it is not.
The first figure is the amount of extract, the second the active fraction inside it. Why that distinction matters for what you buy is covered in KSM-66, Sensoril or powder.
What happens if you take ashwagandha daily?
Daily use is exactly what has been studied, but only across eight to sixteen weeks. For longer use the data are missing, and that is not a detail. On 5 March 2024 RIVM advised against supplements containing ashwagandha, after reports including harmful effects in the liver.
The pattern LiverTox describes usually begins two to twelve weeks after starting.
That falls precisely inside the window where you are still waiting to see whether it works. Which values would show it is covered in ashwagandha side effects.
How long can you keep taking it?
There is no evidence-based answer, because the longest published trial ran sixteen weeks and used a crossover design. What happens after six months or a year has not been studied systematically.
Sellers recommending a three-month course are therefore not leaning on research.
If you take medication or have a liver condition, discuss this with your GP or pharmacist before using anything long term.
What to measure instead of going on feel
Eight weeks is long enough to convince yourself of almost anything. That is not cynical, it is precisely why trials have a placebo group.
My own approach would be this. Say you start today and measure again after 8 weeks, at the same time of day.
A cortisol test before you start and again after eight weeks gives you two numbers instead of two feelings. If you train mainly for strength, total testosterone belongs alongside it.
Why feel and measurement diverge so often is covered in ashwagandha reviews. The full picture is in the ashwagandha overview.
Every blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
References
- RIVM. Advice on products containing Huperzia serrata, Tabernanthe iboga or ashwagandha. 5 March 2024.
- Chandrasekhar K, Kapoor J, Anishetty S. Indian J Psychol Med. 2012 (PMID 23439798).
- Wankhede S, Langade D, Joshi K, Sinha SR, Bhattacharyya S. J Int Soc Sports Nutr. 2015 (PMID 26609282).
- Sharma AK, Basu I, Singh S. J Altern Complement Med. 2018 (PMID 28829155).
- Lopresti AL, Drummond PD, Smith SJ. Am J Mens Health. 2019 (PMID 30854916).
- LiverTox. Ashwagandha. NCBI Bookshelf, NBK548536.
Autor
Enhanced Health
Dr. Naimi, lekarz wpisany do holenderskiego rejestru BIG, nadzoruje standardy medyczne naszych treści i ocen. Przeczytaj naszą politykę medyczną
Powiązane badania
Powiązane artykuły
Ashwagandha and testosterone: what the trials measured in athletes
Ashwagandha KSM-66, Sensoril or powder: what is the difference?
