NOT A CHILL PILL

Somewhere between the third meeting and the fourth coffee, a colleague leans over and says: "You should try ashwagandha. It fixes stress."

Fixes. Like it's a leaking tap.

Here's the honest version. Ashwagandha is one of the very few herbal supplements with real, repeated, placebo-controlled evidence behind it. It is also wrapped in more nonsense than almost anything else on the shelf. This is the bit in the middle, what it does, what it doesn't, and who should leave it alone.

First, A Word About Cortisol

Cortisol has a bad reputation it doesn't fully deserve. It's the hormone that gets you out of bed. It's supposed to be high in the morning, it peaks about half an hour after you wake, and low by the time you're brushing your teeth at night. A wave. Up with the sun, down with the moon.

The problem isn't cortisol. The problem is a wave that never comes down. Deadlines at 11 p.m. Doom-scrolling at midnight. A brain that's still writing emails while the body is lying in the dark. That's the tired-but-wired feeling: the alarm system stuck in the on position.

So when someone says "ashwagandha lowers cortisol," the useful question is: lowers it how, by how much, and does that actually change how you feel?

Top: what cortisol is supposed to do. Bottom: your Tuesday.

What The Studies Actually Found

Small trials. Consistent direction. Modest numbers.

The study everyone quotes comes from India. Sixty-four adults with chronic stress took either 300 mg of ashwagandha root extract twice a day, or a placebo, for 60 days. The ashwagandha group's blood cortisol dropped by about 28%; the placebo group's by 8%. On the standard stress questionnaire, their scores fell by roughly 44%. 1

A second trial, run in Australia with a different extract at a lower dose (240 mg a day), found the same shape: anxiety scores down, morning cortisol down by about 23%, over the same 60 days.2

And when researchers pooled the trials together, the answer held. Across the placebo-controlled studies, ashwagandha meaningfully reduced both stress and anxiety scores.3 Sleep improved too, modestly, and mostly in people who already slept badly, took at least 600 mg a day, and stuck with it for eight weeks or more.4

That's the good news. Now the fine print, because you deserve it.

• The trials are small. Sixty people here, sixty there. Real, but not the thousands you'd want before calling anything settled.
• Many were paid for by the companies that make the extract. That doesn't make them wrong. It does mean "28%" is the best-case number, not the average one.
• Cortisol on a lab report and calm in your chest are not the same thing. Some studies find the number drops more than the feeling does. Both matter. They're just not interchangeable.
• Nobody has studied it for long. Most trials stop at eight to twelve weeks. Beyond three months, the honest answer is we don't know.5

It's not a switch. It's a dial, turned slowly.

How It Works (In One Paragraph)

Ashwagandha is what Ayurveda calls a rasayana, a tonic, and what modern researchers call an adaptogen: something that seems to blunt the body's stress response rather than sedate you. The working theory is that its active compounds, withanolides, nudge the brain-to-adrenal signalling loop that tells your glands how much cortisol to make. Nudge, not kill. Which is why it doesn't feel like a sedative and why it takes weeks, not minutes.5

What It Won't Do

• It won't work tonight. Every positive trial ran for six to eight weeks. If you take one capsule before a presentation and feel calmer, that's you, not the root.
• It won't fix a 1 a.m. bedtime. It can lower the wave. It can't argue with your calendar. The boring foundations, light, sleep timing, movement, the phone in the other room, still do most of the work.
• It's not a treatment for anxiety disorders or depression. If it's more than stress, if it's panic, or weeks of flatness, that's a conversation with a doctor, not a capsule.

Who Should Leave It Alone

This is the part most brands put in six-point grey text. We're putting it here, in the middle, in full size.

• Pregnant or breastfeeding? No. Some regulators advise against it outright.5
• Thyroid condition? Ashwagandha can nudge thyroid hormone levels up. If you have hyperthyroidism, or you're on thyroid medication, check with your doctor first.5
• Liver? Rare, but real: there are documented cases of liver injury linked to ashwagandha supplements. If you have liver disease, or you develop yellowing skin, dark urine or unusual fatigue while taking it, stop and get checked.5
• On sedatives, or about to have surgery? It can add to the drowsiness. Tell your doctor what you're taking.
• Autoimmune condition or prostate cancer? Not without medical advice.5

Also: buy the root. The trials used standardised root extract at 240– 600 mg a day. A random "ashwagandha blend" with a mystery dose is a very different product with the same name on the front.

Eight weeks. Every day. Then decide.

So Should You Take It?

If you're a broadly healthy adult who is stressed in the ordinary, modern, too-many-tabs way, and none of the flags above apply, ashwagandha is one of the few things on the shelf with a real shot at helping. Give it a fair trial: a proper dose, every day, for eight weeks. Then ask yourself honestly whether anything changed. If not, stop. If yes, take a break every few months, because nobody has studied year-round use.

And whatever you do, don't let it become the thing you take instead of fixing the day. It's a dial, not a switch. The switch is still your bedtime.

At SILT, we like ashwagandha for exactly what it is: a well-studied root with a modest, real effect and a clear list of who shouldn't take it. We'll never call it a cure. We'll call it a start.

References

1. Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine. 2012;34(3):255–262. doi:10.4103/0253-7176.106022
2. Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: a randomized, double-blind, placebo-controlled study. Medicine (Baltimore). 2019;98(37):e17186. doi:10.1097/MD.0000000000017186
3. Akhgarjand C, Asoudeh F, Bagheri A, et al. Does ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis of randomized controlled trials. Phytotherapy Research. 2022;36(11):4115–doi:10.1002/ptr.7598
4. Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. Effect of ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS ONE. 2021;16(9):e0257843. doi:10.1371/journal.pone.0257843
5. National Institutes of Health, Office of Dietary Supplements. Ashwagandha: Is it helpful for stress, anxiety, or sleep? Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Ashwagandha-HealthProfessional/