Vetiver Side Effects: Is Vetiver Water Safe to Drink?

Vetiver water has no documented serious side effects, but that is mainly because it has never been properly studied in humans: there are no clinical trials and no published poisoning series for drinking root-infused water. The practical risks are elsewhere: pure vetiver essential oil (skin irritation, never to be swallowed), sugary khus syrups sold as “vetiver drinks”, and roots of unknown origin, since vetiver is a plant known to store heavy metals in its roots when it grows on contaminated soil.

Vetiver (Chrysopogon zizanioides, formerly Vetiveria zizanioides) is called ushira in Sanskrit and khus or khas in Hindi. The tradition uses its roots, not its leaves, to cool the body in hot weather. Here is what can honestly be said about its safety.

What the evidence says (and does not say)

A 2021 literature review by Grover and colleagues in Environmental Science and Pollution Research compiled the phytochemistry and pharmacology of vetiver (Grover et al., 2021). Its conclusion is telling: many traditional uses have been tested in laboratory and animal models using root extracts, leaves or root oil, but the active constituents and their mechanisms still need to be established. In other words, there is no human dataset from which to draw a safe daily amount of vetiver water, a list of side effects or a list of drug interactions.

So the honest answer to “what are the side effects of vetiver water?” has two parts: no harm has been reported for the traditional drink, and no one has looked closely enough to rule harm out. Common-sense precautions follow from that gap.

Side effects and risks by form

Form	What is known	Practical precaution
Root soaked in drinking water (khus water)	Traditional use; no documented adverse effects, but no human studies either	Use clean, traceable roots; rinse them; replace the water daily; moderate amounts
Khus syrup and “khus” drinks	Many are mostly sugar, flavoring and green coloring; real root content is rarely stated	Read the label; count it as a sugary drink, especially with diabetes
Pure vetiver essential oil on the skin	Concentrated aromatic compounds; irritation or sensitization possible, as with other essential oils	Always dilute in a carrier oil; patch-test on a small area first
Essential oil taken by mouth	No safety data supporting internal use	Do not swallow it; keep bottles away from children
Khus mats, fans, curtains	External, environmental use; no known specific risk	Keep mats clean and dry to avoid mold

The overlooked issue: where the roots come from

Vetiver is one of the plants most studied for phytoremediation, meaning the clean-up of polluted soils. A review in the International Journal of Phytoremediation describes vetiver as tolerant of a wide range of heavy metals (arsenic, cadmium, chromium, lead, mercury and others) and notes that most of the metals it absorbs are stored in its roots, with lead levels of up to about 1% measured in the roots under test conditions (Danh et al., 2009). These were glasshouse and field experiments on contaminated soils, not tests of roots sold for drinking water, so they do not mean store-bought vetiver is contaminated.

They do mean that the roots are exactly the part you steep, and that vetiver grown along roadsides, near industrial sites or on land used to clean up pollution is not something to put in your water jug. Buy roots from a seller who can name the origin, and avoid loose roots of unknown source.

Heavy metals are not a theoretical worry in this category of products. When researchers analyzed 193 Ayurvedic medicines ordered from websites, about one in five (20.7%) contained detectable lead, mercury or arsenic, whether made in the US or in India (Saper et al., JAMA, 2008). In the US, herbal supplements do not need FDA approval before they go on sale, so quality depends on the manufacturer. Our guide to trustworthy Ayurvedic brands explains what to look for.

Who should avoid vetiver or ask a professional first

Situation	Why	What to do
Pregnancy and breastfeeding	No safety data for concentrated forms or essential oil	Avoid the essential oil; ask your midwife or doctor before regular use of other forms
Babies and young children	Essential oils can be harmful if swallowed or applied undiluted	No essential oil; store bottles out of reach
Diabetes or weight management	Most khus syrups are sugar-based	Prefer plain root-infused water over syrup
Sensitive or eczema-prone skin	Risk of irritation from concentrated oils	Dilute well and patch-test, or avoid
Taking regular medication	Interactions have never been studied	Mention it to your pharmacist or doctor before daily use

How to prepare vetiver water with fewer risks

• Choose clean, whole roots from a traceable source, ideally labelled as food grade;
• Rinse the roots well, then soak a small bundle in a clay pot or jug of drinking water for a few hours;
• Change the water every day and let the roots dry between uses so they do not grow mold; discard roots that smell musty;
• Drink it as you would ordinary water in hot weather, not as a concentrated remedy;
• Stop if you notice any unusual reaction, and seek medical advice if it persists.

The tradition sees vetiver as cooling in the Pitta sense; our articles on cooling down naturally in summer and excessive sweating put it in context. Vetiver water is a refreshing drink, not a treatment: heat exhaustion, dehydration or persistent symptoms call for medical care.

Precautions in short

• No drug interactions are documented, simply because none have been studied;
• Never swallow pure essential oil, and always dilute it before skin use;
• Treat khus syrup as a sugary drink;
• Source roots carefully because they can store heavy metals from the soil they grew in;
• Pregnancy, breastfeeding, young children and chronic illness: ask a professional first.

The general rules for all Ayurvedic herbs and products are in our safety and precautions guide.