Most people get the best results from ashwagandha by taking 300 to 600 mg of a standardized root extract daily, with or without food, at whatever time of day fits their goals. But the details matter: the form you choose, when you take it, how long you stay on it, and whether you cycle off all affect how well it works and how safe it is over time.
Choosing the Right Form and Dose
Ashwagandha comes as standardized extract capsules, raw root powder, gummies, and liquid tinctures. The most studied forms are concentrated root extracts, and the dose that shows up most often in clinical trials falls between 240 and 1,250 mg per day of extract. Raw root powder requires much higher amounts to deliver the same active compounds. In one study, participants took 12,000 mg per day of whole root granules, the equivalent of 6,000 mg of root powder, to match what a few hundred milligrams of extract provides.
The active compounds in ashwagandha are called withanolides, and this is the number worth checking on any supplement label. Clinical studies typically use extracts standardized to about 2.5% withanolides. A 350 mg capsule at that concentration delivers roughly 2.5 mg of withanolides per capsule, with study participants often taking two capsules daily. If your product doesn’t list a withanolide percentage, it’s hard to know what you’re actually getting.
Capsules and tablets standardized from root-only extracts (often labeled KSM-66) or root-and-leaf blends (like Sensoril or Shoden) are the forms with the most research behind them. Gummies are convenient but sometimes contain lower concentrations or added sugars. Powders are flexible since you can mix them into drinks or food, but their earthy, bitter taste puts many people off. If you want to match what the clinical evidence actually tested, a standardized extract capsule is the most straightforward choice.
When to Take It: Morning vs. Night
You can take ashwagandha at any time of day. The best timing depends on why you’re taking it.
If your goal is stress management or general wellness, taking it in the morning alongside your other supplements keeps things simple and consistent. If you’re using it primarily to improve sleep, taking it in the evening makes more sense. Some people mix ashwagandha powder into warm milk before bed, a traditional preparation sometimes called “moon milk,” to wind down at night.
One practical consideration: ashwagandha causes stomach discomfort in some people, especially on an empty stomach. If that happens to you, try taking it with a meal. Some of ashwagandha’s active compounds are fat-soluble, so eating it alongside food that contains some fat may help with absorption, though capsules and gummies generally work fine either way. If morning doses upset your stomach regardless of food, switching to an evening dose after dinner often solves the problem.
How Long It Takes to Work
Ashwagandha is not something you feel after a single dose. The clinical trials that show benefits for stress and anxiety typically run for 6 to 12 weeks, with most participants reporting noticeable changes somewhere around the 4 to 8 week mark. This is consistent with how adaptogens work in general: they gradually shift your body’s stress response rather than producing an immediate effect.
Ashwagandha also contains both water-soluble and fat-soluble compounds. The water-soluble ones clear your body within 2 to 3 days, while the fat-soluble ones can take up to a month to fully leave your system. This means the supplement builds up in your body over time, which is part of why consistency matters more than perfect timing on any given day.
Cycling: Why You Shouldn’t Take It Indefinitely
Taking ashwagandha continuously without breaks is a common mistake. Neuroscientist Andrew Huberman recommends limiting high-dose use to about two weeks at a time, followed by two weeks off, to reduce the risk of liver stress and thyroid disruption. The concern is that chronic, uninterrupted use can affect hormone and neurotransmitter pathways in ways that aren’t fully understood yet.
There’s no single universally agreed-upon cycling schedule, but the two-weeks-on, two-weeks-off approach is a reasonable starting framework. Some people use longer cycles of 8 to 12 weeks on, followed by 2 to 4 weeks off, which more closely mirrors how clinical trials are structured. The key principle is the same either way: build in regular breaks rather than treating ashwagandha as something you take every day for years.
Who Should Avoid It
Ashwagandha is not safe for everyone. The National Center for Complementary and Integrative Health flags several groups who should avoid it entirely:
- Pregnant or breastfeeding women. Ashwagandha should not be used during pregnancy or while nursing.
- People with thyroid disorders. Ashwagandha can alter thyroid hormone levels, making it risky for anyone with hyperthyroidism, hypothyroidism, or Hashimoto’s disease.
- People with autoimmune conditions. Because ashwagandha can stimulate immune activity, it may worsen conditions like lupus, rheumatoid arthritis, or multiple sclerosis.
- People scheduled for surgery. Its sedative and blood-pressure-lowering effects can interfere with anesthesia and surgical recovery.
- People with hormone-sensitive prostate cancer. Ashwagandha may increase testosterone levels, which can fuel tumor growth.
Ashwagandha also interacts with several categories of medication. If you take drugs for diabetes, high blood pressure, seizures, or thyroid conditions, or if you’re on immunosuppressants or sedatives, ashwagandha can amplify or interfere with their effects.
Common Side Effects
Most people tolerate ashwagandha well at standard doses, but side effects do occur. The most frequently reported ones are drowsiness, stomach upset, diarrhea, and vomiting. Drowsiness is more likely at higher doses or when ashwagandha is combined with other calming supplements.
Liver injury is rare but has been documented in a number of case reports linked to ashwagandha supplements. This is one of the strongest arguments for cycling rather than continuous long-term use, and for sticking to doses within the range that clinical trials have actually tested. More is not better with this supplement. If you notice unusual fatigue, dark urine, or yellowing skin, stop taking it.
A Practical Starting Routine
If you’re new to ashwagandha, a sensible approach is to start with 300 mg of a standardized root extract (look for at least 2.5% withanolides on the label) once daily. Take it in the morning with breakfast if your goal is stress relief, or in the evening with dinner if you’re targeting sleep. Give it at least 4 to 6 weeks of consistent daily use before judging whether it’s working. After 8 to 12 weeks, take a break of at least 2 weeks before starting another cycle. Keep the total daily dose at or below 600 mg of extract unless you have a specific reason to go higher.