Ashwagandha Benefits: What the Evidence Shows, and the Safety Questions (UK)

What the research on ashwagandha actually shows for stress and cortisol, how gummies compare with capsules, and the UK safety questions (FSA review, liver, thyroid, pregnancy, medication) to check before you take it.

By GUUDIES Editorial Team Published 9 March 2026 Updated 26 October 2026 7 min read

Ashwagandha Benefits: What the Evidence Shows, and the Safety Questions (UK)

By the GUUDIES Editorial Team · Updated 26 October 2026 · Claims checked against the GB Nutrition and Health Claims Register; sources below.

Disclosure: GUUDIES makes a daily gummy pouch. Our Daily Greens+ gummy contains a small amount of ashwagandha as part of a 200mg greens blend. We do not sell a standalone ashwagandha product, and we explain the safety questions below as plainly as we can.

The short answer: the main researched "benefit" of ashwagandha is lower self-reported stress and lower cortisol in small trials, mostly lasting about eight weeks, using specific root extracts at around 240–600mg a day. There is no authorised health claim for ashwagandha in Great Britain, the Food Standards Agency (FSA) is reviewing its safety, and it is not suitable for everyone, so speak to your GP or pharmacist before you start.

What Is Ashwagandha?

Ashwagandha (Withania somnifera) is a shrub used in Ayurvedic tradition. Most supplements use an extract of the root, sometimes with the leaf, and many are standardised to a stated percentage of withanolides, the compounds researchers usually measure. It is often described as an "adaptogen", but that is a marketing and traditional-medicine term, not a regulatory category, and it is not an approved claim in the UK.

Ashwagandha gummies have become one of the most searched formats. The format itself changes little; what matters is which extract is used, how much is in a daily serving, and whether that matches anything that has been studied.

Ashwagandha Benefits: What the Research Actually Shows

We can describe published research, but we cannot tell you ashwagandha will do any of these things for you. No ashwagandha health claim has been authorised in Great Britain.

Stress and cortisol. In a 2012 randomised, placebo-controlled trial of 64 adults with a history of chronic stress, a root extract taken at 300mg twice a day for 60 days was reported to lower stress-scale scores and serum cortisol compared with placebo (Chandrasekhar et al., 2012).
Lower-dose extract. A 2019 trial of 60 stressed but healthy adults found that 240mg a day of a different extract for 60 days reduced anxiety scores and morning cortisol compared with placebo. The authors called for larger, more diverse studies (Lopresti et al., 2019).
Sleep. Some trials have measured sleep quality as a secondary outcome, with mixed and modest results. It is not a sleeping aid and should not be described as one.
Exercise and testosterone. A handful of small trials, often funded by extract makers, have reported changes in strength or hormone levels. These findings are early and have not led to any authorised claim.

Overall, the trials are small, short, often industry-funded and use different extracts, so results from one cannot be applied to another. Longer-term safety data is limited, which is one reason regulators are taking a closer look.

Is Ashwagandha Safe? What UK Buyers Should Know

This is the section most ashwagandha articles skip. Please read it before you buy anything containing ashwagandha, including our own product.

FSA safety review. The FSA ran a call for evidence on ashwagandha food supplements in 2024, citing reports of effects on thyroid hormone levels, low blood sugar and potential liver toxicity. It says there are no established safe levels or set limits for ashwagandha in food supplements in the UK, and it planned to ask the Committee on Toxicity for a risk assessment (FSA).
Liver injury reports. The US National Institutes of Health's LiverTox database rates ashwagandha as a likely cause of clinically apparent liver injury. Reported cases typically appeared 2 to 12 weeks after starting and usually resolved after stopping, but rare serious cases have occurred, mainly in people with existing liver disease (LiverTox). Stop and see a doctor if you notice yellowing skin or eyes, dark urine, itching or unusual tiredness.
Pregnancy and breastfeeding. There is not enough safety evidence. Avoid ashwagandha unless your GP or midwife advises otherwise.
Thyroid. Because ashwagandha may affect thyroid hormone levels, talk to your GP first if you have a thyroid condition or take thyroid medication.
Medication. Check with a pharmacist if you take medicines for diabetes, blood pressure, thyroid, immune conditions, anxiety, sleep or epilepsy, or anything sedating.

Ashwagandha Gummies vs Capsules

	Ashwagandha capsules	Ashwagandha gummies
Typical dose	Often 300–600mg extract per serving	Varies widely; check mg per gummy and how many make a serving
Extract named?	Often states a branded or standardised extract	Sometimes only "ashwagandha root" with no standardisation
Sugar	Usually none	Check grams per gummy
Ease of taking	Need swallowing	Chew and go

Whatever the format, look for the extract type, the amount in mg per daily serving, the withanolide percentage if stated, and clear safety warnings. Be cautious of any product that promises to "lower cortisol" or "end stress"; those claims are not authorised in the UK.

Who Should Not Take Ashwagandha?

Anyone pregnant, trying to conceive or breastfeeding.
People with liver disease or a history of liver problems.
People with thyroid conditions, autoimmune conditions or on related medication, unless a doctor agrees.
Anyone due to have surgery (tell your surgical team about all supplements).
Under-18s.

Better Places to Start With Stress

If stress is affecting your sleep, mood or daily life, the everyday basics come first: regular sleep times, movement, cutting back on alcohol and caffeine, and talking to someone. If you have felt anxious or low for more than a couple of weeks, speak to your GP. A supplement should never be a substitute for that conversation.

Where GUUDIES Fits

GUUDIES is not an ashwagandha supplement. It is one daily pouch of six pectin-based gummies for adults. The Daily Greens+ gummy includes ashwagandha as one of 14 plants in a 200mg greens blend, so the amount is far below the doses used in the trials above, and we make no ashwagandha claims for it. What Daily Greens+ is built around is vitamins and minerals: for example, vitamins B6 and B12 contribute to normal psychological function, and pantothenic acid contributes to normal mental performance.

Because it contains ashwagandha, please check with your GP or pharmacist before taking GUUDIES if you are pregnant, breastfeeding, have a liver or thyroid condition, or take medication. Five of the six gummies are vegan; Marine Collagen contains fish. Full doses are on our ingredients page.

See the GUUDIES daily pouch

Common Questions

What are the benefits of ashwagandha?
Small trials have reported lower stress scores and lower cortisol with specific root extracts over about eight weeks. There is no authorised health claim for ashwagandha in Great Britain, so no product can promise these effects.

Do ashwagandha gummies work?
Only if they contain a studied extract at a similar dose, and even then the evidence is modest. Many gummies list a low or unstandardised amount, so check the label.

Is ashwagandha safe to take every day?
Long-term safety data is limited. The FSA is reviewing ashwagandha after reports of thyroid effects and possible liver toxicity, so speak to your GP or pharmacist first, especially if you have a health condition or take medication.

Can I take ashwagandha while pregnant or breastfeeding?
No, not without medical advice. There is not enough evidence that it is safe.

How long does ashwagandha take to work?
Most trials ran for around 60 days. There is no reliable evidence of quick effects, and liver problems, if they occur, have usually appeared within the first three months.