Drynaria Fern (Drynaria roosii): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Drynaria fern help heal bone fractures?

Drynaria roosii contains flavonoids like naringenin and hesperidin that stimulate osteoblast proliferation and differentiation, promoting new bone formation. These compounds appear to enhance the expression of bone morphogenetic proteins and inhibit osteoclast activity, reducing bone resorption. In Traditional Chinese Medicine, Drynaria is classified as a kidney-tonifying herb that strengthens bones and connective tissue. Evidence level: C (preclinical studies support these mechanisms, though human clinical trials remain limited).

Does Drynaria interact with any medications?

Drynaria may interact with anticoagulant and antiplatelet medications due to its flavonoid content, which can affect blood clotting pathways. Patients taking warfarin, aspirin, clopidogrel, or other blood thinners should consult a healthcare provider before use, as concurrent use may increase bleeding risk. Limited pharmacokinetic data exists for specific drug-herb interactions with Drynaria. Evidence level: C. Always inform your healthcare provider about all herbal supplements you are taking.

What is the recommended dosage for Drynaria fern?

The typical adult dosage for Drynaria rhizome is 9-15 grams daily as a decoction when prepared as a traditional herbal tea. For standardized extracts, 500mg taken twice daily is commonly recommended. Dosage may vary based on the specific formulation, concentration, and condition being addressed. Evidence level: C (based on traditional use and expert consensus). Consult a qualified practitioner for personalized dosing recommendations tailored to your specific needs.

Is Drynaria safe to take during pregnancy?

Drynaria is contraindicated during pregnancy and should be avoided. Traditional Chinese Medicine classifies this herb as unsafe for pregnant women, as it may stimulate uterine contractions or affect fetal development. Women who are breastfeeding should also avoid Drynaria due to insufficient safety data. Evidence level: C. Always consult a qualified healthcare provider before taking any herbal supplements during pregnancy or while nursing.

What is Drynaria fern used for in Traditional Chinese Medicine?

Drynaria roosii, known as "Gu Sui Bu" meaning "mend the shattered," is primarily used for promoting bone fracture healing and treating kidney deficiency patterns. Traditional applications include accelerating fracture recovery, addressing tinnitus and hearing loss associated with kidney deficiency, relieving dental pain, and supporting osteoporosis prevention. Evidence level: C. The herb has been used for centuries in TCM practice, though modern clinical evidence supporting these uses remains limited.

What are the side effects and contraindications of Drynaria?

Drynaria is generally well-tolerated, with mild gastrointestinal discomfort being the most commonly reported side effect. The herb is contraindicated in patients with yin deficiency patterns, characterized by symptoms such as night sweats, dry mouth, hot flashes, and restlessness, as it may worsen these conditions. Evidence level: C. Discontinue use if adverse reactions occur and consult a qualified healthcare provider before starting any new herbal regimen.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Drynaria roosii (Drynariae Rhizoma) is a medicinal fern used in traditional Chinese medicine primarily for treating bone-related diseases and osteoporosis [PMID:41850642, PMID:31443447].

Background

Drynaria roosii Nakaike is an epiphytic fern widely distributed in China and Southeast Asia [PMID:39195505]. It is characterized by having both nest leaves and sporotrophophyll leaves, with the dried rhizome serving as the primary medicinal part [PMID:41441045, PMID:39195505].

Traditional uses

Traditionally used for the treatment of bone fractures, osteoporosis, kidney deficiency, and to promote blood circulation and remove blood stasis [PMID:41850642, PMID:37535166, PMID:41690984]. It is also used in tonic diets and Chinese patented medicine [PMID:39195505].

Active compounds

The rhizomes are rich in flavonoids, including naringin, neoeriocitrin, quercetin-3-O-sophoroside, morin, and hesperetin-7-O-glucoside [PMID:41850642, PMID:39195505, PMID:37535166]. Other identified components include naringenin chalcone, caffeic acid 4-O-β-D-glucoside, and cytotoxic bis(lauric acid-12-yl)lignanoates (liglaurates A-E) [PMID:42163262, PMID:37535166, PMID:35240135].

Mechanism of action

Total flavonoids of D. roosii may promote bone regeneration by regulating the SDF-1/CXCR4 axis to enhance the migration and osteogenic differentiation of bone marrow stromal cells (BMSCs) [PMID:41582570]. Additionally, they may target NRF2-mediated anti-ferroptosis in osteoblasts to promote membrane osteogenesis [PMID:41826993]. Exosome-like nanovesicles from D. roosii promote alveolar socket healing via activation of ITPR3-mediated calcium flux [PMID:42163262].

Clinical evidence

Evidence AOsteoporosis (Rat models)

Systematic review and meta-analysis indicate efficacy in improving bone mineral density (BMD), trabecular microarchitecture, and biomechanical properties [PMID:41850642]

Evidence DOsteoporosis and Obesity (OVX Mice)

Water extract of D. roosii reversed body weight gain, gonadal fat mass, and trabecular bone loss in ovariectomized mice fed a high-fat diet [PMID:31443447]

Evidence DAlveolar Socket Healing (Mouse model)

Drynaria roosii-derived exosome-like nanovesicles and naringenin chalcone promoted mineralization and bone regeneration [PMID:42163262]

Evidence DKnee Osteoarthritis (Rat model)

As part of the Gubi Zhitong formula, D. roosii contributed to alleviating KOA by regulating the Piezo1 mediated Ca2+ signaling pathway and PI3K/Akt/NF-κB axis [PMID:41173085]

Safety & adverse effects

In vivo studies of exosome-like nanovesicles and naringenin chalcone confirmed their safety in bone regeneration models [PMID:42163262].

Evidence summary

The evidence is primarily based on preclinical animal models (rats, mice, zebrafish) and in vitro cell cultures, with one systematic review/meta-analysis supporting its use for osteoporosis in rats. Human clinical trial data is not provided in the abstracts.

PubMed sources

1.PMID: 33473696 (2017) — Complete chloroplast genome sequence of the medical fern Drynaria roosii and its phylogenetic analysis. · Mitochondrial DNA. Part B, Resources
2.PMID: 35240135 (2022) — Liglaurates A-E, cytotoxic bis(lauric acid-12yl)lignanoates from the rhizomes of Drynaria roosii Nakaike. · Phytochemistry
3.PMID: 41850642 (2026) — Efficacy of Rhizoma Drynariae (Drynaria roosii Nakaike) extracts in treating osteoporosis in rat models: A systematic review and meta-analysis. · Journal of ethnopharmacology
4.PMID: 39195505 (2024) — Epiphytic Patterns Impacting Metabolite Diversity of Drynaria roosii Rhizomes Based on Widely Targeted Metabolomics. · Metabolites
5.PMID: 15633809 (2004) — The effect of Gu-Sui-Bu (Drynaria fortunei) on bone cell activity.

Drynaria Fern

Sources & Citations

Calculate a safe dose of Drynaria Fern

Waltheria Indica

Andiroba

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Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources

Drynaria Fern

Sources & Citations

Calculate a safe dose of Drynaria Fern

Related Herbs

Waltheria Indica

Andiroba

Salsola kali

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources