Supplements

11 best ashwagandha supplements for 2026, approved by experts and Glamour editors

A super-helpful herb.
Best ashwaghanda supplement UK 2026
Getty Images/Collage: Condé Nast

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Your ashwagandha FAQs, answered:

What are the benefits of ashwagandha?

Among experts and those in the know, Ashwagandha is praised for its many uses. However, it’s perhaps best known for how it can help the body adapt to both physiological and psychological stresses by reducing the activity of the HPA axis — AKA the body's main stress response system.

In doing this, your stress response isn’t activated, which means that the pituitary gland doesn’t stimulate the production of cortisol (AKA the stress hormone). As well as this, ashwagandha may also help with your sleep, focus, energy levels, and cognitive function, as well as balancing your blood sugar levels.

“Growing scientific evidence supports the many health benefits of ashwagandha, an adaptogenic herb,” says Dr Sidra Samad, Medical Consultant at Charava. "By lowering cortisol levels, reducing anxiety, and enhancing overall resilience, it helps the body adapt to stressful situations. Clinical research has demonstrated improvements in mood stability, cognitive function, and sleep quality, especially in people with chronic stress.

She continues: “By improving mitochondrial function and lowering fatigue, ashwagandha also promotes energy and endurance. According to research, it may help regulate thyroid and adrenal hormones in both sexes and increase testosterone and fertility in men.”

Nutritional therapist Caroline Mason agrees that it's especially beneficial for men: “For men specifically, ashwagandha is also a great supplement for fertility, and to support the production of healthy testosterone." She flags one study which tested the impact of ashwagandha on men with fertility issues and found it prompted a vast improvement in sperm quality, with an impressive 14% of partners becoming pregnant.

How and when should you take ashwagandha supplements?

“The best way to take ashwagandha depends on your goals, but consistency and quality matter the most," recommends Samad. "Most people benefit from taking 300 – 600 mg daily, preferably with food to enhance absorption.

Sandrine Olmi, a Registered Nutritional Therapist adds that ashwagandha capsules and tinctures can be taken at any time of day, depending on your needs. “You can choose to take it in the morning to support energy levels and stress management, or if you are looking for calm and relaxation, it is best to take it at night,” she says. It is normally recommended to take Ashwagandha with food.

In terms of which types — capsules, gummies, gels or drinkable powders — Samad praises capsules for their convenience and accurate dosing. However, powders added to warm milk, smoothies, or herbal tea avoid adding a step to your morning routine.

How do I know if an ashwagandha supplement is high quality?

When it comes to finding the most high-quality ashwagandha, Olmi explains that there are two forms available: KSM-66 and regular ashwagandha. “Traditional ashwagandha is composed of extracts derived from both the leaf and root of the ashwagandha plant, whereas KSM-66 ashwagandha combines a clinically validated dose of the most researched ashwagandha root extract with third-party testing.”

Can you take too many supplements?

“While supplements are considered safe to take, more isn't always better,” details Samad. "For example, ashwagandha doesn't require high or frequent dosages to work; rather, it restores hormonal and stress balance gradually. According to research, most adults can safely and effectively take doses of 300 – 600 mg of standardised extract daily.”

Of course, following the manufacturer's dosage instructions is always recommended, and if concerned, check in with your GP — especially if you're pregnant, nursing, or taking any other medication.

How long does it take for ashwagandha to start working?

Consistency is key when it comes to starting your ashwagandha journey: “In most cases, it makes a wonderful daily supplement — and you can expect to feel the difference in four to 12 weeks,” details Mason.

Who shouldn't take ashwagandha — and are there any side effects?

As always, if you’re unsure about whether a supplement is suitable for you, check with your GP or a trusted healthcare professional — especially if you have underlying medical issues. It's also not advisable to take ashwagandha if you're pregnant or breastfeeding.

“Anyone who’s taking medication should definitely speak with their doctor or seek medical advice beforehand, as ashwagandha can interact with blood pressure, immunosuppressants, sedatives, anti-seizure, diabetic and thyroid medications,” says Mason.

In terms of potential side effects, only a small percentage of people who use ashwagandha have issues with ashwagandha. “Side effects are very rare — but as typically reported to be nausea, a change in bowel movements, or an upset stomach," says Mason.

Olmi does add, however, that although most research data indicate that ashwagandha supplementation is safe and tolerable for up to three months, more data is needed to evaluate the safety of higher doses and longer periods of supplementation.


Meet the experts:

Caroline MasonRegistered Nutritional Therapist at Baldo & Mason.
Sasha ParkinNutritional Therapist at Wild Nutrition.
Sandrine OlmiRegistered Nutritional Therapist
Dr Sidra SamadMedical Consultant at Charava.