Most clinical studies on women use between 300 and 600 mg of ashwagandha root extract per day, typically split into two doses taken with meals. There is no officially established dose, and the right amount depends on what you’re taking it for, but that 300 to 600 mg range is the most consistently studied and the best starting point for most women.
The Most Common Dosage Range
Research on ashwagandha has tested daily doses anywhere from 120 mg to 12,000 mg, but the vast majority of clinical trials land between 150 and 600 mg per day. The sweet spot in most studies is 500 to 600 mg daily for general stress and well-being benefits, though some women report improvements at doses as low as 120 mg per day.
How you divide the dose matters too. Many trials have participants take one capsule in the morning and one in the evening, both after meals. Others use a single daily dose. There’s no clear evidence that one approach works better than the other, but splitting the dose may help maintain steadier levels throughout the day and reduce the chance of stomach discomfort.
Dosages Studied for Specific Goals
Menopause Symptoms
A randomized, placebo-controlled trial published in Frontiers in Reproductive Health tested 300 mg of a standardized root extract twice daily (600 mg total) in perimenopausal and postmenopausal women for eight weeks. The women who took ashwagandha had significant improvements across psychological symptoms like anxiety and irritability, physical symptoms like fatigue, and urogenital symptoms compared to the placebo group. Hot flash frequency also decreased more in the ashwagandha group than in the placebo group. This 600 mg per day dose, using an extract standardized to at least 5% withanolides, is the best-studied protocol for menopause support.
Fertility and Cycle Regularity
Ashwagandha may influence hormones involved in ovulation and menstrual regularity, including follicle-stimulating hormone and luteinizing hormone. It also contains plant compounds that share some structural similarities with estrogen, which could help restore hormonal balance in conditions like PCOS. A small 2015 study also found that ashwagandha root extract improved markers of sexual function in women. Most of these studies used doses in the 300 to 600 mg range, though the evidence here is still preliminary compared to the stress and menopause research.
Thyroid Support
A clinical trial of 50 people with mildly underactive thyroid function found that 300 mg twice daily (600 mg total) for eight weeks improved thyroid hormone levels and lowered TSH compared to placebo. This is worth noting because it cuts both ways: if you have a sluggish thyroid and aren’t on medication, ashwagandha may offer some benefit. But if you’re already taking thyroid medication, ashwagandha could interfere with your dosing and push your levels out of range. More on that below.
Why Extract Type Changes the Effective Dose
Not all ashwagandha supplements contain the same concentration of active compounds. The key ingredients, called withanolides, can range from 1.5% to 35% of the extract depending on how it’s processed. A capsule standardized to 5% withanolides delivers a very different amount of active compound than one standardized to 2.5%, even if both say “300 mg” on the label.
Many supplements don’t disclose their withanolide content at all, which makes comparison difficult. If you’re choosing a product, look for one that specifies the withanolide percentage. The most commonly studied branded extracts are standardized to around 5% or higher, and the clinical doses of 300 to 600 mg per day are based on these concentrations. A lower-potency extract might require a higher milligram dose to deliver the same effect, and a very high-potency extract might need less.
How Long Before You Notice Results
Most clinical trials run for 8 to 12 weeks, and that’s generally the window where measurable changes in stress hormones, sleep quality, or menopausal symptoms appear. Some women notice improvements in anxiety or sleep within the first few weeks, but the hormonal and physical effects tend to build gradually. If you’ve been taking ashwagandha for two months and haven’t noticed a difference, the dose or extract may not be right for you.
Because long-term safety data beyond a few months is limited, a common approach is to take ashwagandha for 8 to 12 weeks, pause for 2 to 4 weeks, and then reassess whether you want to continue. This isn’t a strict medical requirement, but it reflects the reality that most of what we know about safety comes from studies of that length.
Safety Concerns Specific to Women
Ashwagandha should not be taken during pregnancy. The German Federal Institute for Risk Assessment specifically advises against its use by pregnant women, breastfeeding women, and children. Ashwagandha has a historical use as an abortifacient, meaning it was traditionally used to induce miscarriage, and there is not enough safety data to consider it safe during pregnancy or while nursing.
If you take thyroid medication, ashwagandha can alter your thyroid hormone levels enough to interfere with your treatment. Even at moderate doses of 300 mg twice daily, studies have documented increases in T3 and T4 levels. This interaction isn’t always harmful, but it means your medication may need adjusting, and your thyroid levels should be monitored if you decide to try it.
Liver injury is another concern that has gained attention in recent years. Reports of ashwagandha-related liver damage have increased, prompting researchers to call for stricter quality and safety monitoring of ashwagandha supplements. The risk appears to be rare and may be related to contamination, incorrect dosing, or individual sensitivity rather than the herb itself. Still, if you have existing liver disease, ashwagandha is best avoided. For everyone else, sticking to well-tested doses from reputable brands and not exceeding 600 mg per day without a specific reason reduces your risk.
A Practical Starting Protocol
If you’re a healthy adult woman trying ashwagandha for the first time, start with 300 mg of a standardized root extract (look for at least 5% withanolides) once daily with food. After a week or two, if you tolerate it well, you can increase to 300 mg twice daily, once with breakfast and once with dinner. Use it consistently for 8 to 12 weeks before judging whether it’s working, then take a 2 to 4 week break. Going above 600 mg per day isn’t supported by stronger evidence for most purposes and increases the likelihood of side effects like drowsiness or stomach upset.