Quick Summary

Drynaria fortunei is a traditional Chinese medicinal herb commonly used in formulations for bone-related disorders such as osteoporosis and osteoporotic fractures. Clinical and experimental research mainly supports its potential role in improving bone mineral density and bone regeneration, often as part of multicomponent herbal therapies. Evidence predominantly comes from preclinical studies and randomized controlled trials conducted in combination with conventional treatments. However, the overall quality of clinical evidence is limited by methodological issues and low certainty.

What is It?

Drynaria fortunei, also known as Rhizoma Drynariae, is a fern species whose dried rhizomes are used in traditional Chinese medicine. It has a long history of use in bone health and related conditions and is commonly included in herbal mixtures aimed at supporting skeletal integrity and repair.

Traditional Uses

  • Supporting bone healing and regeneration
  • Treating osteoporosis and osteoporotic fractures
  • General reinforcement of bone strength and health

Active Compounds

The herb contains various bioactive constituents, primarily total flavonoids extracted from its rhizomes. These flavonoids are believed to contribute to its effects on bone metabolism by influencing osteoblast and osteoclast activity and possibly promoting bone repair mechanisms.

Potential Benefits with Evidence Levels

  • Improving bone mineral density and supporting bone regeneration:

    Evidence level: Low to moderate certainty in humans.

    Multiple randomized controlled trials and meta-analyses indicate that Drynaria-containing herbal medicines or total flavonoids from Rhizoma Drynariae (TFRD) may improve bone mineral density in osteoporosis patients and might reduce fracture risk. However, issues such as heterogeneity of studies, high risk of bias, and low quality temper the strength of these findings. Preclinical and mechanistic studies support its influence on bone-forming and bone-resorbing cells.
  • Adjunctive therapy combined with bisphosphonates in primary osteoporosis:

    Evidence level: Very low certainty.

    Systematic reviews suggest that combining herbal medicines, possibly including Drynaria, with bisphosphonates could enhance bone mineral density more than bisphosphonates alone. Nevertheless, the supporting data have significant limitations, including high heterogeneity and poor study quality.

Side Effects

Reported adverse effects are generally mild and infrequent, primarily involving gastrointestinal symptoms such as nausea and diarrhea. These symptoms tended to resolve after stopping treatment. No serious adverse events have been documented in clinical trials to date. Animal studies indicate an acceptable biosafety profile, but comprehensive human safety data are lacking.

Drug Interactions

No specific drug interaction data for Drynaria fortunei were identified in the available evidence. Caution should be exercised when combining it with other medications due to limited interaction studies.

Who Should Avoid It?

  • No explicit contraindications for Drynaria fortunei were found in current clinical literature.
  • Due to lack of safety data, pregnant or breastfeeding women should avoid use or consult a healthcare professional before use.

Evidence Limitations

  • Most human studies use herbal combinations rather than Drynaria fortunei as a single agent, limiting attribution of effects exclusively to this herb.
  • High heterogeneity, risk of bias, and low methodological quality in clinical trials reduce confidence in efficacy conclusions.
  • There is a lack of large, high-quality randomized controlled trials specifically assessing Drynaria fortunei as monotherapy.
  • Limited data exist on long-term safety, drug interactions, and use in special populations such as pregnant or breastfeeding women.

References

Last Reviewed

April 2024

Informational Disclaimer: This page is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your healthcare provider with any questions you may have regarding a medical condition or before starting any new treatment, including herbal supplements.