Ashwagandha (Asgand): What to Expect and Who Must Not Take It
Why does the same root get sold to a stressed student as a calming powder, to a gym-goer as a testosterone booster, and to a tired uncle as a winter tonic? Because ashwagandha (asgand nagori) has a long tradition, a short list of things it fairly does, and a marketing department that ignores the difference.
The short version
- What it is: the root of Withania somnifera, a shrub of the nightshade family; asgand or asgand nagori in Unani, ashwagandha in Ayurveda
- Fair to expect: a calmer, less wired feeling and easier sleep for some people after a few weeks
- Not fair to expect: big changes in testosterone, muscle, weight or blood sugar
- Commonly taken as: root powder in warm milk at night, by tradition, or capsules; the pack or a qualified practitioner sets the amount
- Must not take: thyroid disease without a doctor’s say-so, pregnancy, anyone on sedatives, autoimmune conditions, and the 2 weeks before surgery
Prefer to listen? This post as a 4 min video · Watch the video
What tradition says
The Sanskrit name means “smell of a horse”, partly for the odour of the fresh root and partly for the strength it was meant to give. Ayurveda lists it as a rasayana, a restorative, and as a balya, a strengthener, given to the elderly, the convalescent and the anxious. Unani hakeems know it as asgand and rate it hot and dry in the second degree, prescribing it for weakness, joint pain, poor sleep and “nervous debility”, usually with milk and ghee to soften its heat. The Nagori variety, from the Nagaur region of Rajasthan, is considered the best grade, which is why you see “nagori” on packets whether or not the root ever saw Rajasthan.
What both traditions agree on is the pairing with milk and the timing at night. That is a useful hint about what the plant actually does.
The classical way to take asgand was as a churna, a fine root powder, stirred into a cup of warm milk with a little ghee or honey, drunk at bedtime through the winter and stopped as the weather warmed. Hakeems also made an asgand pak, a sweet with the powder cooked into milk, sugar and nuts, given to new mothers and to the elderly. Never at breakfast, never for children, and always in a “cooling” carrier like milk. The restraint in that is worth noticing.
What is fair to expect
Calm and sleep
This is the one honest, modest claim. People who take ashwagandha for a few weeks often describe feeling less on edge, less reactive, and falling asleep more easily. The species name somnifera means sleep-bringing, and the tradition of taking it at night with milk points the same way. Do not expect a sedative that knocks you out; expect, at best, a slightly lower background hum after 4 to 8 weeks. If your sleep problem is a phone at 1 a.m., our wind-down guide will do more than any powder, and the stress and breathing reset costs nothing.
Strength, testosterone, muscle
The gym version of ashwagandha promises higher testosterone and bigger lifts. Treat that as marketing. Any effect here is small, inconsistent between people, and swamped by sleep, protein and training. A man with genuinely low energy or libido is better served by a blood test than by a supplement; low thyroid, low iron, low vitamin D and undiagnosed diabetes are common and fixable.
Weight, sugar, blood pressure
Not what it is for. It may nudge blood sugar and blood pressure downward slightly in some people, which is a reason for caution if you take medicine for either, not a reason to take it.
How it is commonly taken
- Powder, the traditional way. Root powder stirred into a cup of warm milk at bedtime, sometimes with a little ghee or honey. How much is for the pack or a qualified practitioner to set, and tradition starts on the small side for the first week to see how the stomach takes it.
- Capsules or tablets. These are usually a concentrated root extract, so a capsule can’t be compared with the loose powder. Follow the pack’s directions and do not double up.
- Timing. Evening, with food or milk. Taken on an empty stomach it commonly causes nausea or loose motions.
- Length. Tradition treats it as a winter course, not a year-round habit: a couple of months, then a break. If nothing has changed after 8 weeks, it is not doing anything for you and there is no reason to continue.
- Check the powder. Genuine root powder is pale beige to light brown, smells earthy and faintly of horse (truly), and tastes bitter. Grey, gritty or odourless powder is suspect; leaf powder and fillers are common substitutes.
All of this describes tradition and ordinary use, not a prescription. Anyone with a medical condition needs the conversation in the next section before the first spoon.
Who must not take it
This list is the most important part of the article, and it is longer than most packets admit.
Thyroid disease
Ashwagandha can push thyroid hormone levels up. For someone with an overactive thyroid that is dangerous. For someone on levothyroxine for an underactive thyroid it can unbalance a dose that took months to get right. If you have any thyroid condition, or a family history and unexplained palpitations, weight change or heat intolerance, do not take it without your doctor’s agreement and a plan to recheck your levels. Our hypothyroidism article explains why levothyroxine is so sensitive to what else you take.
Pregnancy and breastfeeding
Traditionally avoided in pregnancy, and there is a long-standing concern about miscarriage risk at larger amounts. No safety data for breastfeeding. Treat it as off the table for both, including the “mild” milk version.
Sedatives, sleeping pills and alcohol
Because it has a calming, drowsy-making effect of its own, it stacks with benzodiazepines, sleeping tablets, some antidepressants, strong antihistamines and alcohol. The result is more drowsiness than you planned for, which matters if you drive or work at height.
Autoimmune conditions
Rheumatoid arthritis, lupus, multiple sclerosis, Hashimoto’s thyroiditis, psoriasis and similar. Ashwagandha is thought to stimulate immune activity, which is the wrong direction for a disease where the immune system is already overactive, and it can work against the medicines used to calm it.
Before surgery
Stop it at least 2 weeks before any operation. It can add to the drowsiness of anaesthesia and may slow the return to normal afterwards. Tell the anaesthetist you were taking it.
Also take care if
You are on tablets for blood pressure or diabetes (it may add to their effect; watch for dizziness or low-sugar symptoms and tell your doctor). You have liver disease or have ever had jaundice from a supplement; there are reports of liver injury with some ashwagandha products, so stop at once for dark urine, pale stools, itching or yellow eyes. You have a hormone-sensitive prostate condition. You are allergic to nightshades (tomato, potato, brinjal), since it is the same family. Children should not be given it at all outside a doctor’s advice.
Stop and see a doctor for: yellow eyes or skin, dark urine, severe stomach pain, a racing heart, or new tremor or heat intolerance (possible thyroid effect). If you are on levothyroxine, carbimazole, sedatives, blood pressure or diabetes medicine, or any immune-suppressing drug, do not start, stop or change anything without your doctor knowing, in either direction. And no herb answers these. Chest pain. Breathlessness. Blood in stool, urine or what you cough up. Weight falling off without trying. A lump. More than 3 days of fever. Yellow eyes or skin. A fit. Sudden weakness or slurred speech. Bleeding in pregnancy. A baby under 3 months with a fever. Every one of those goes straight to a doctor.
Myth: it is natural, so it cannot clash with medicine
Every entry in the list above is a way it clashes with something. Ashwagandha is a plant that changes thyroid activity, drowsiness, immune activity, blood pressure and blood sugar, which is exactly why it is not nothing, and exactly why “natural” is not the same as “safe with everything”. The honest summary is that it is a reasonably gentle root with a real calming effect for some people, and a genuine list of people who should not touch it.
Bought from a hakeem or a supplement shop, ashwagandha often sits beside salajeet and a majoon or two, all sold for “taqat”. Each deserves the same honest look, which is the job of our Unani & Herbal, Decoded series.
Frequently asked questions
What does ashwagandha actually do?
The one honest, modest claim is calm and sleep. After a few weeks some people feel less on edge and fall asleep more easily; the species name somnifera means sleep-bringing. It isn’t a sedative that knocks you out, and the big promises about testosterone, muscle, weight and sugar aren’t what it’s for.
How long does ashwagandha take to work?
People who notice a change usually do so within 4 to 8 weeks. If nothing has shifted by 8 weeks, stop. It isn’t working for you, and continuing only adds cost and risk.
How is ashwagandha traditionally taken?
By tradition, as root powder stirred into warm milk at bedtime, sometimes with a little ghee, as a winter course of a couple of months. How much is for the pack or a qualified practitioner to say; capsules are concentrated extracts, so never match them spoon for spoon. Anyone with thyroid disease, pregnancy, autoimmune illness or on sedatives should not start it without a doctor.
What are the side effects of ashwagandha?
Nausea, loose motions and stomach upset are the common ones, especially on an empty stomach, along with drowsiness and sometimes headache. Rarely it irritates the liver. Dark urine, pale stools, itching or yellow eyes mean stop at once and see a doctor.
Can I take ashwagandha with thyroid tablets?
Not without your doctor agreeing and a plan to recheck your levels. It can push thyroid hormone up, which can unbalance a levothyroxine dose that took months to settle or make an overactive thyroid worse. This is the most common serious clash with this herb. New palpitations, tremor or heat intolerance are a reason to call your doctor.
Is ashwagandha safe in pregnancy?
No. It’s traditionally avoided in pregnancy, with a long-standing concern about miscarriage at larger amounts, and there’s no safety data for breastfeeding. Skip it, milk version included, for both.
Does ashwagandha increase testosterone?
Any effect is small and unreliable, and swamped by sleep, protein and training. If low energy or libido is the worry, a blood test for thyroid, sugar, iron and vitamin D is the useful first step. Those causes are common and fixable.
Can I take ashwagandha every day?
Tradition sees it as a seasonal course, a couple of months in winter and then a break, not a year-round habit. If you’ve been taking it daily for months, ask whether it’s still doing anything. Anyone on regular medicine should check with their doctor before making it daily.
Is ashwagandha good for sleep and anxiety?
For some people it takes the edge off. Expect a slightly lower background hum after several weeks, not a knockout. If your sleep problem is a phone at 1 a.m. or a racing mind, a wind-down routine does more. Anxiety that stops you working or sleeping for weeks deserves a doctor.
Can I take ashwagandha with sleeping pills or antidepressants?
Be careful. It has a drowsy effect of its own, and it stacks with benzodiazepines, sleeping tablets, some antidepressants, strong antihistamines and alcohol. That matters if you drive or work at height. Tell your doctor before combining, and don’t adjust the prescribed medicine yourself.
Can diabetics or BP patients take ashwagandha?
Only with a doctor in the loop. It may add slightly to the effect of diabetes and blood pressure tablets, so watch for dizziness or shaky, sweaty low-sugar spells. It isn’t a replacement for either medicine.
Who should not take ashwagandha?
Anyone with thyroid disease unless their doctor agrees, pregnant or breastfeeding women, people on sedatives, and those with autoimmune conditions like rheumatoid arthritis, lupus, Hashimoto’s or psoriasis. Also children, people with liver trouble, a hormone-sensitive prostate condition or a nightshade allergy. Stop it at least 2 weeks before surgery and tell the anaesthetist.
Can children have ashwagandha milk?
Not as a routine. There’s no good safety data for children and no reason a healthy child needs it. A tired or anxious child needs sleep, food and, if it carries on, a doctor.
Powder or capsules: which is better?
Powder is the traditional form, easier to judge by colour and smell and easier to take in small amounts. Capsules are concentrated extracts, less predictable. Neither is any safer for people on the must-not list.
How do I know ashwagandha powder is genuine?
Genuine root powder is pale beige to light brown, smells earthy and faintly of horse, and tastes bitter. Grey, gritty or odourless powder is suspect, since leaf powder and fillers are common substitutes. Buying from a maker with a DRAP enlistment number on the pack is a better bet than loose powder.
Is asgand nagori the same as ashwagandha?
Yes. Asgand is the Unani name for Withania somnifera root and ashwagandha the Ayurvedic one. Nagori refers to the Nagaur region of Rajasthan, considered the best grade, though the word appears on packets whether or not the root came from there.