Educational information, not medical advice — ask your doctor or midwife.
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.
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.
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.
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.
See a doctor if a broken bone is not healing, if pain gets worse, or if you cannot put weight on the limb.
Get medical help quickly if you notice unusual bruising, nosebleeds, bleeding gums, blood in your stool or urine, yellow skin or eyes, dark urine, or a rash with swelling of the face or throat.
Tell your doctor or pharmacist that you are taking this herb before any surgery, dental work or new prescription.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Gu Sui Bu is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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