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Stress doesn’t always feel like stress. A lot of the time it just looks like this:
If more than a couple of those ring a bell, it probably isn’t that you need to try harder. It could be that you're sitting in a constant state of stress.
KSM-66® Ashwagandha is supported by 90 randomised, double-blind, placebo-controlled studies. Pick what matters to you and see what the trials found.
Across multiple high-quality human trials, KSM-66 has been shown to significantly reduce stress and anxiety scores, and serum cortisol (the stress hormone). Participants also reported significant increases in happiness and perceived quality of life, and lower levels of stress-related food cravings.
KSM-66 significantly improved sleep quality — a reduction in sleep latency (the time it takes to fall asleep), improvements in total sleep time, and improved alertness and feeling of restfulness on waking.
KSM-66 significantly improved muscle strength, muscle size and recovery across both men and women. Significant improvements in cardiorespiratory endurance were also observed, with VO2 max (oxygen capacity) significantly improved for both men and women.
KSM-66 has been shown to support healthy hormone levels in both men and women. Men saw significant increases in total and free testosterone and dihydrotestosterone (DHT). Women saw favourable improvements across estrogen, progesterone, prolactin and more, and menopausal women saw reductions in symptoms including hot flashes and perceived stress.
For men, studies show significant improvements in overall sexual function, arousal, orgasm and sexual drive, alongside increased semen volume and sperm count and quality. For women, studies show significant improvements in overall female sexual function scores — arousal, desire, lubrication, orgasm frequency and quality — and reduced sexual distress scores.
*Based on 90 randomised, double-blind, placebo-controlled studies on KSM-66. Individual results vary.
Ashwagandha quality can vary massively, that's why we only use KSM-66® Ashwagandha!
|
Generic ashwagandha | |
|---|---|---|
| The SourceRoots, per the certificate of analysis | Root only | Often root + leaf |
| WithanolidesThe good stuff, measured by HPLC | ≥5% | Often unstated |
| Withaferin AThe bad stuff, can be toxic! | ≤0.1% | Usually undisclosed, so may be present... |
| Clinical Trials | 90 | Usually none |
| Extraction | No alcohol or chemical solvents | Varies |
| Heavy metals, aflatoxins, pesticidesEvery batch | Tested | Varies |
| Quality certificationsUSDA Organic, Non-GMO Project, GFCO, BSCG drug-free | 46 | Varies |
Batch KSM/VG/FG/26/1083 tested at 5.27% withanolides and 0.03% Withaferin A by HPLC, against specifications of ≥5% and ≤0.1%. Lead, cadmium and arsenic <0.5ppm, mercury <0.1ppm, aflatoxins <5ppb; E. coli, salmonella and S. aureus absent. KSM-66® figures from ksm66ashwagandhaa.com, checked August 2026. Root-only sourcing reflects the Ayurvedic, US, British and Indian Pharmacopoeias and the WHO monograph, none of which list the leaf. “Generic ashwagandha” describes the category rather than any named product.
Every number here comes off the label or out of a lab. Turn the tub over to read the panel, or open the certificate for the batch that made it.
| Ingredient | Per capsule |
|---|---|
| KSM-66® Ashwagandha Root Extract Withania somnifera, std. to 5% withanolides | 600mg |
Other ingredients: HPMC capsule, anti-caking agents (551, 460).
*note the label currently says gelatine capsules but all batches KSM-66 from August 2026 onward use HPMC vegetable capsules.
Every batch, independently tested
Ashwagandha is a plant, and plants vary. So each batch is assayed for actives and screened for contaminants before it is capsuled. These are the results for the batch this tub came from.
| Test | Spec | This batch |
|---|---|---|
| Withanolides HPLC | ≥ 5% | 5.27% |
| Withaferin A HPLC | ≤ 0.1% | 0.03% |
| Lead, cadmium, arsenic | < 0.5ppm | < 0.5 ppm |
| Mercury | < 0.1ppm | < 0.1 ppm |
| Aflatoxins B1, B2, G1, G2 | < 5 ppb | < 5 ppb |
| E. coli, salmonella, S. aureus | Absent | Absent |
Results are for the batch named above and are supplied by the extract manufacturer. ppm = parts per million, ppb = parts per billion.
Give it eight weeks. Most of the research on KSM-66 runs for 8 to 12 weeks, and that is where the meaningful results show up.
Sleep is usually the first thing people mention, often inside the first couple of weeks. As an adaptogen, it takes some time to build and you won't necessarily feel something immediately, so if you are waiting for one you will decide it does not work long before it has had a chance to.
One capsule a day. For general use, mid-morning. If you are taking it mainly for sleep, take it 30 to 60 minutes before bed.
Taking it at some point each day beats a perfect time you keep forgetting.
It should not. It is not a sedative and it does not knock you out — most people describe feeling less wound up rather than sleepy.
Some people do feel noticeably relaxed. If that is you, move it to the evening and use it as a wind-down instead.
That is a fair question and it deserves an honest answer.
Ashwagandha usually shows up as an absence rather than a presence. The small stuff bothering you as much, getting to sleep without the nightly mental replay, a shorter recovery from a bad day. It is the kind of change you notice looking back a month, not the kind you feel an hour after a capsule.
Take it daily for eight weeks before you judge it. And if it genuinely is not for you, it is not for you - that happens, and we would rather you know that than keep buying it out of habit.
There is no established need to. The clinical work runs 8 to 12 weeks continuously, and some studies have gone longer.
Plenty of people prefer to take a week or two off every few months anyway. Nothing wrong with that.
Coffee is fine, they are not working against each other, and ashwagandha will not blunt your caffeine.
It stacks fine with the rest of our range too. If you are on prescription medication, always consult with your GP to be safe
Yes. The capsule is HPMC, which is plant-derived.
Older label artwork says gelatin, but every batch from August 2026 onward uses HPMC vegetable capsules, and the artwork is catching up.
It matters. Ashwagandha leaf is much higher in Withaferin A, the compound behind most of the caution around the plant, and leaf material is cheaper to include.
KSM-66 is extracted from the root alone, with no alcohol or chemical solvents. Our batch tested at 0.03% Withaferin A against a specification of 0.1% or less. Most products will not tell you either number, because most do not measure them.
People do report it, and we are not going to wave it away.
You will not find much about it in the clinical trials, partly because of what those trials measure. They track stress scores and cortisol, not whether you still enjoy things. The people describing this online are describing something the research mostly did not think to ask about.
The likely explanation is straightforward. What ashwagandha does is take the top off your stress response, some people who were used to massive lows and massive highs because of poorly managed stress may view stability and calm for "numb", when in reality... they're just actually chill for once!
Some things worth remembering - if you take an antidepressant, emotional blunting is a well-documented effect of those on their own, which makes it very hard to tell what is causing what, talk to your doctor before adding this.
There are case reports, and we are not going to pretend otherwise. Around 23 have been published, usually appearing between two and twelve weeks after starting, and usually resolving once the person stopped taking it. Against how many people take ashwagandha worldwide, it is rare - but rare is not never.
What the reports have in common is worth knowing. A lot of them involve multi-herb blends, or products that turned out to be mislabelled or to contain something other than what was on the front. That makes it genuinely hard to say what caused what.
It is a large part of why we sell a single identified extract, from one plant part, tested batch by batch, with the certificate published on this page. It is not a guarantee (nobody can give you one) but it removes the question of what is actually in the capsule.
Stop taking it and see a doctor if you get unusual tiredness, nausea, itching, dark urine, or any yellowing of the skin or eyes. If you have a liver condition or you drink heavily, talk to your doctor before you start.
Do not take it if you are pregnant or trying to become pregnant, or if you are breastfeeding.
Always talk to your GP or prescribing doctor if you're on prescription medication and are unsure.
Overall rating: 5.0 / 5 from 27 reviews.
Have been using KSM-66 everyday now since launch and I’ve noticed some massive improvement to my everyday life stress the way my body operates and tackles situations, Paired with CALM and my sleep has improved 110% I value my sleep being a natty gym goer so it’s really important for me that it helps me achieve some deeeep sleep!
Great product. Helping me sleep after shift work at all hours.
Thus stuff is next level. Literally from the first night I took it, it has given me a more restful sleep and I am able to wake up at 5am to workout feeling ready to go! It's actually amazing stuff and my smartwatch has picked up on this too, giving me way better sleep scores and higher body battery scores as well which is super telling! Will definitely keep purchasing!
Amazing stuff. Just glad there’s an NZ company that can be trusted for this stuff which is traditional underdosed and shit. Leaving country so won’t reorder but I love it and I hope you guys are the biggest NZ brand when I come back
Really enjoying this! Helping with my sleep heaps when combined with calm. Will buy again!
A friend put me onto KSM after she got seriously sick of listening to me complain constantly about the lack of sleep (and quality sleep) I was getting. It has definitely helped with getting-to-sleep, as well as waking up less exhausted. I am also far less likely to make questionable life decisions, or snap at my most useless colleagues purely from lack of sleep. 10/10 from me.
First time using Ksm-66, very happy with the results, especially the sleep quality. Paired with Uglyface Calm, my sleep has never been better.
The KSM/Calm 1-2 punch has been game changing for my sleep. Now sleeping unbroken much more regularly and getting deeper, more restorative sleep as a result. Genuinely a life changing product
Been getting some good sleeps and haven’t been so stressed like I normally do
Love this stuff! Can feel the effects after just one day, and it helps me get to sleep quickly when I take it in the evening, not to mention the other effects… ;)
The KSM-66 is a game changer, my morning brain fog is reduced and my sleep quality has been drastically better.
Apart from absolutely pumpin in the bedroom, way better sleeps and not groggy asf in the mornings anymore
I have never slept so well than with this combined with Calm
Great product
Great combo and love the transparency with the ingredients
This really worked for me I've tried a couple products and they didn't deliver the results I wanted
Really good stuff
I’ve noticed a positive effect of this supplement. And will be ordering more in the future.
Very good quality
Great product- does exactly what you would expect it too!
Have only been taking it with calm at night, so not sure if I have noticed the benefits yet. Awesome fast delivery.
A++++
Must have in my life now
Has helped me in all the ways described, already ordered my next lot
A+ product will keep buying
Works a treat
A+
