What is Xian Mao?

Xian Mao is a dried root-like stem, called a rhizome, from a small Asian plant. Its plant name is Curculigo orchioides. It is also sold as Curculigo rhizome, or golden eye-grass.

This is a single herb, not a blend. In Chinese medicine it is used as a warming herb for a cold, weak lower back and knees, low sex drive, and tiredness in older adults. It is most often one part of a larger herb formula.

Human trial evidence for this herb on its own is very thin. It has a long record in one tradition, but traditional use is not proof that a herb works.

How does Xian Mao work?

No one has proven how Xian Mao works in people. The ideas below come from old texts and from lab work, not from good human trials.

In Chinese medicine, Xian Mao is said to warm the kidney system, drive out cold and damp, and make the sinews and bones stronger. That is a way of sorting symptoms, not a claim about body chemistry.

In lab and animal studies, extracts of the root have shown mild hormone-like, anti-swelling and antioxidant activity. Some animal work points to a weak estrogen-like effect.

These results are early. They do not tell you what a cup of the herb does in a person.

What forms does Xian Mao come in?

The most common form is the sliced, dried root. It is simmered in water to make a decoction (a strong herbal tea).

You may also see it as granules or a powder that you stir into hot water. Some shops sell capsules or tinctures (alcohol extracts). It is also sold pre-cooked in wine, a classic Chinese processing step.

In practice, Xian Mao is rarely taken alone. It is usually one herb in a formula, such as the well-known pairing with Yin Yang Huo.

Where it comes from:

Xian Mao has been used in Chinese medicine for over a thousand years. It appears in Tang-era herb texts and stayed in use through later classics.

Indian Ayurvedic medicine uses a related plant, Kali Musli, for similar purposes. Modern Chinese practice mostly uses it inside formulas, such as Er Xian Tang, a 20th-century mix aimed at menopause symptoms.

What does Xian Mao help with?

• Menopause symptoms such as hot flushes: This is the most studied use, but the studies test whole formulas, not Xian Mao alone. Er Xian Tang, a formula that contains it, has been trialled in China for hot flushes and mood changes. Study quality is mostly poor and results are mixed, so we cannot say the herb itself helps.
• Low sex drive and erection problems: This is the classic traditional use, going back many centuries. Animal work has shown some effect on mating behaviour in rodents. There are no good human trials of Xian Mao on its own for this.
• Cold, aching lower back and knees: Traditional texts use Xian Mao for pain that feels better with warmth. This matches its label as a warming herb. Human evidence is absent; the support is traditional only.
• Tiredness and weakness in older adults: Classical use is for people who feel cold, worn out and weak in the legs. Lab work shows antioxidant activity, which does not prove a benefit in people. Treat this as traditional use, not proven effect.
• Frequent night-time urination: Old texts link this herb to bladder control in older people. No human trial has tested that claim. Frequent night-time urination can signal diabetes, prostate trouble or a bladder infection, so get it checked first.
• Weak bones (osteoporosis) as part of a formula: Cell and animal studies suggest curculigoside may affect bone-building cells. This is early lab work. It does not show that taking the herb protects bone in people, and it is no substitute for proven bone treatment.

Which foods are rich in Xian Mao?

1. Not found in everyday food: Xian Mao is a medicinal root, not a cooking ingredient

Practical Tips:

It is sometimes soaked in rice wine at home, but that adds alcohol and does not make it safer.

What are the side effects of Xian Mao?

• Dry mouth and thirst
• Nausea or stomach ache
• Loose stools
• A burning or numb feeling on the tongue at higher doses
• Feeling hot, flushed or restless
• Skin rash
• Rare liver injury, with yellow skin or eyes, dark urine and deep tiredness

Good to know:

Most reports of trouble are mild stomach upset, dry mouth and feeling too warm. These usually fade when you stop.

Chinese sources list Xian Mao as slightly toxic. Large or long-term doses are the main worry. Liver injury has been reported with Curculigo-containing products, which is rare but serious.

Stop the herb and call a doctor if your skin or eyes turn yellow, your urine turns dark, or you feel very tired and sick. Do not wait to see if it passes.

How much Xian Mao should you take?

• Recommended daily: There is no dose proven safe and helpful by modern trials. Chinese herbal texts and pharmacopoeia list 3 to 9 grams of the dried root per day, simmered in water. A few sources allow up to 10 grams. Higher amounts are linked to a burning or numb feeling on the tongue. Stay at the low end unless a trained practitioner says otherwise. If you use a capsule or tincture, follow the label and do not double up.
• Best time of day: Usually taken in the morning and early evening, in two split doses. Avoid taking it late at night, since some people find it warming and hard to settle with.
• With or without food: Take it with or just after food. Food lowers the chance of nausea and stomach ache, which are the most common complaints.
• Time to effect: Nobody knows, because the herb has not been tested this way in people. Traditional use suggests two to four weeks for warming effects. If nothing has changed after about six weeks, stop and rethink.
• How long to take it: Short courses are safer. Many practitioners use it for 4 to 8 weeks, then stop and review. Do not take it for months on end without a check-up. Because liver harm has been reported with this herb, a doctor may want to test your liver if you keep using it. Stop at once if you feel unwell.