Lavender Cotton Drug Interactions, Uses, Safety & More

Lavender cotton (Santolina chamaecyparissus) is a small, silvery-gray evergreen shrub in the daisy family (Asteraceae). Despite its name, it is not related to true lavender. It is native to the Mediterranean region and grows in dry, sunny areas. It is widely planted in gardens because of its silvery foliage and strong, somewhat camphor-like scent.

The plant has a long history in traditional European and Mediterranean folk medicine. People have used its leaves, flowering tops, and essential oil for stomach complaints, to try to expel intestinal worms, and as a natural insect repellent. Today it is most often found as a dried herb, a tea, or an aromatic oil rather than as a standardized supplement.

Lavender cotton has been used traditionally for several purposes, but high-quality human studies are largely missing. Most of what we know comes from folk use, laboratory tests, or small animal experiments.

• Digestive upset: Traditionally taken as a tea for indigestion and gas. Evidence in humans is essentially absent.
• Intestinal worms: Historically used as a worming remedy. There is no reliable modern evidence that it is safe or effective for this.
• Insect repellent: Its strong aroma has led to use against moths and insects. Laboratory work has looked at the essential oil, but human data are limited.
• Antimicrobial/antioxidant effects: Some lab studies report that extracts can slow the growth of certain microbes or act as antioxidants, but this does not prove benefit in people.

Overall, the evidence for lavender cotton is weak and preliminary. It should not be relied on to treat any medical condition.

Lavender cotton contains aromatic compounds in its essential oil, along with flavonoids and other plant chemicals. These substances are thought to give it its scent and its possible antimicrobial and antioxidant activity seen in laboratory tests.

Proposed actions—such as relaxing the digestive tract, repelling insects, or fighting microbes—are mostly based on test-tube and animal research. How well any of this translates to real effects in the human body is not well understood. The exact active ingredients and how they behave in people have not been clearly established.

There is not much modern safety information about lavender cotton. Because it belongs to the daisy (Asteraceae) family, people who are allergic to plants like ragweed, marigolds, daisies, or chrysanthemums may also react to it.

Concentrated essential oils can be irritating and should never be swallowed undiluted. Pregnant women should avoid lavender cotton, since it has traditionally been used to bring on menstruation and could theoretically affect the uterus. It should also be avoided while breastfeeding because there is no information on its safety for nursing infants. Children, and people with liver or kidney problems, should not use it without medical advice.

Because quality and strength vary widely between products, always talk with a pharmacist or doctor before using it.

Reported side effects are not well documented, but possible problems include allergic skin reactions, contact dermatitis, and stomach upset. People sensitive to other daisy-family plants are at higher risk of allergy.

Swallowing large amounts of the herb or its essential oil could cause nausea, vomiting, or other toxic effects. If you notice a rash, swelling, trouble breathing, or other signs of an allergic reaction, stop using it and seek medical care.

There is no established or standardized dose for lavender cotton. Traditional use as a mild tea does not mean a safe dose has been scientifically defined, and the essential oil is much more concentrated than the dried herb.

If you choose to use a product, follow the directions on the label and do not exceed them. Essential oils should be kept out of reach of children and never taken by mouth without professional guidance. Check with your pharmacist or doctor before starting, especially if you take other medicines or have a health condition.