What is Gu Sui Bu?

Gu Sui Bu is a dried stem that grows just under the soil. It comes from a fern called Drynaria. The name means "mender of shattered bones".

Chinese medicine uses it to help bones knit after a break. It is also used for a sore low back, weak knees, loose teeth and ringing in the ears. Some people dab a soaked form on the scalp for hair loss.

Here is the short verdict. It has a long record in one tradition, but human proof is thin.

A long history tells us what healers did. It does not tell us that the herb works.

How does Gu Sui Bu work?

Short answer: no one has shown how it works in people.

Lab tests show it is rich in naringin, a plant compound also found in grapefruit. In cells and in rats, naringin seems to push bone-building cells to work harder. It may also slow the cells that break bone down.

In Chinese medicine the idea is different. The herb is said to warm the kidney, which that system links to bones and teeth. That is a way of sorting signs, not a lab finding.

These are clues, not proof. Rat bones and human bones do not always act the same way.

What forms does Gu Sui Bu come in?

Most often you meet it as dried slices, boiled into a strong tea called a decoction.

Other forms are powder, capsules, and a tincture (a liquid made by soaking the herb in alcohol). Some bone-health pills list it beside other herbs. Slices baked with salt or vinegar are common, and the baking is meant to steer its action.

A tincture is also painted on the scalp for patchy hair loss. Read the label, as most products are blends rather than this one herb.

Where it comes from:

Gu Sui Bu first shows up in a Tang dynasty book, the Ben Cao Shi Yi, from about 720 CE.

Story says a Tang emperor gave it the name after it helped heal a bad fall. Since then it has been a staple for bone injury in China. It is still listed in the Chinese Pharmacopoeia today.

It is a single herb. Chinese doctors almost never give it on its own.

What does Gu Sui Bu help with?

• Slow-healing bone fractures (broken bones): This is the classic use, and the herb is named for it. Chinese doctors add it to formulas after a break, a sprain or a bad bruise. Human proof is lacking. Animal studies suggest faster bone repair, but that has not been tested well in people. A broken bone still needs a doctor, an X-ray and proper setting.
• Osteoporosis (thinning, brittle bones): Lab and rat work is the main support here. Naringin from the herb appears to help bone-building cells in the dish and in animals. No good trial has tested this herb alone in people with thin bones. It should not replace a bone-density scan or a prescribed bone medicine.
• Low back and knee pain: In Chinese medicine, a sore low back and weak knees are signs linked to the kidney system. Gu Sui Bu is a standard herb for that pattern, usually inside a formula. There is no human trial evidence for pain relief from this herb on its own.
• Loose teeth and shrinking gums: Old texts list this use, and some modern Chinese dental formulas still include the herb. Powder has also been rubbed on the gums. We found no reliable human trial for teeth or gums. Bleeding or loose teeth need a dentist, as they can signal gum disease.
• Tinnitus (ringing in the ears): Classical texts link ear ringing to the same kidney pattern as weak bones, so the herb appears in those formulas. This is a tradition-only use. No human study supports it. New or one-sided ringing should be checked by a doctor.
• Patchy hair loss (used on the skin): A tincture of the herb is painted on bare patches of scalp in Chinese practice. The idea is that the alcohol and the herb irritate the skin and draw blood to it. Evidence in people is very limited. Stop if the skin turns red, sore or itchy.

Which foods are rich in Gu Sui Bu?

1. Grapefruit and pomelo: these contain naringin, the same compound the herb is measured for

Practical Tips:

You cannot get this herb from your diet, and grapefruit is not a substitute for it.

What are the side effects of Gu Sui Bu?

• Upset stomach or nausea
• Loose stools
• Dry mouth and thirst
• Feeling hot, or mouth sores, in people who already run dry and hot
• Skin redness, itching or stinging where a tincture is applied
• Allergic rash (uncommon)

Good to know:

Most reports describe a mild, short-lived stomach upset that settles when the dose drops or the herb is stopped.

Serious harm has not been widely reported. That is partly reassuring and partly a gap, since the herb has not been studied closely in people. Rare problems can stay hidden when no one is looking for them.

Stop the herb and get advice if you get a rash, swelling, yellow skin or eyes, or dark urine.

How much Gu Sui Bu should you take?

• Recommended daily: No dose has been proven safe and useful by modern research. What follows is what Chinese practice uses, not a medical recommendation. Typical amounts in Chinese texts and pharmacopoeia: 3 to 9 grams of dried slices per day, boiled into a tea, is the usual range. Some texts allow up to 15 grams for short spells. Capsules and powders vary widely, so follow the label and check the herb is not buried in a long blend. For scalp use, a tincture is dabbed on the bare patch once or twice a day. Do not swallow scalp tinctures.
• Best time of day: Usually split into two doses, morning and evening. Time of day has not been studied.
• With or without food: Take it with or just after food. This lowers the chance of stomach upset, which is the most common complaint.
• Time to effect: Unknown. In traditional use it is taken over weeks, not days, and bone healing itself takes weeks to months.
• How long to take it: Chinese practice uses it in short courses, often 4 to 8 weeks, while the injury heals. Check in with the person who prescribed it after about a month. Stop and reassess if nothing has changed by 8 weeks. There is no safety data for taking it for months or years.