Costus Drug Interactions, Uses, Effectiveness, Safety & More

Costus usually refers to the root of Saussurea costus, a tall flowering plant in the daisy family. It grows mainly in the high mountains of the Himalayas, including parts of India, Pakistan, and China. The dried root and the oil pressed from it have a strong, distinctive smell.

The root has a long history in Ayurvedic, Unani, and traditional Chinese medicine. People have used it for digestion, coughs, skin problems, and as a general tonic. It is also used in perfumes and incense. Today it is sold as a powder, in capsules, as a tea, and as an essential oil.

Because Saussurea costus is considered an endangered and protected species in some regions, harvesting and trade may be restricted in certain places.

Costus root contains compounds called sesquiterpene lactones, including ones often named costunolide and dehydrocostus lactone, along with essential oils. In laboratory and animal studies, these compounds have shown anti-inflammatory, antimicrobial, and antioxidant activity.

Researchers think these actions might explain some of the traditional uses, such as calming the gut or fighting germs. However, what happens in a test tube or in animals does not always carry over to people. The way costus works in the human body, and at what dose, is not well understood.

There is limited human safety information for costus. Product quality and strength can vary a lot, and some plant products may be contaminated or mislabeled. The essential oil is concentrated and should not be swallowed unless a qualified professional directs it.

Some people are allergic to plants in the daisy (Asteraceae) family, such as ragweed, marigold, and chamomile. If that includes you, you may be more likely to react to costus. Pregnant people should avoid costus, since it has traditionally been thought to stimulate the uterus. Breastfeeding people should also avoid it because of a lack of safety data. Children, and people with liver, kidney, or chronic health conditions, should not use it without medical advice.

Always check with a pharmacist or doctor before starting costus, especially if you take prescription medicines or have an ongoing health problem.

Because costus has not been well studied in people, its full side-effect profile is not known. Possible effects include stomach upset, nausea, or allergic skin reactions, especially in people sensitive to daisy-family plants.

Applied to the skin, the oil may cause irritation or rash in some people. Rarely, herbal products can cause more serious allergic reactions. Stop using costus and seek medical care if you have swelling, trouble breathing, a spreading rash, or other signs of a serious reaction.

There is no well-established or standardized dose of costus for any health condition. Traditional preparations vary widely, and the strength of commercial products is not consistent.

If you choose to use a costus product, follow the directions on the label and do not exceed them. The essential oil is very concentrated and should not be taken by mouth without professional guidance. Talk with a pharmacist or doctor about whether costus is appropriate for you and what amount, if any, might be reasonable.