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Lack of herbal supplement characterization in published randomized controlled trials
Peter M Wolsko1, David K Solondz, Russell S Phillips
1Kaiser Permanente Medical Group, Denver, CO 80020, USA. pete.wolsko@uchsc.edu
The American Journal of Medicine
|October 1, 2005
Summary
Most randomized controlled trials on herbal supplements lack quality control. Few studies verified the actual content of supplements like echinacea, ginkgo, and St. John's wort, impacting clinical trial reliability.
Area of Science:
- Pharmacology
- Integrative Medicine
- Clinical Trial Design
Background:
- Herbal supplements exhibit significant variability in quality and content.
- Poor quality control in herbal products can compromise research integrity.
Purpose of the Study:
- To assess the characterization and content verification of herbal supplements in published randomized controlled trials (RCTs).
- To evaluate the extent to which RCTs ensure the quality of herbal products under investigation.
Main Methods:
- Systematic review of MEDLINE-indexed English language RCTs on single-herb preparations (echinacea, garlic, ginkgo, saw palmetto, St. John's wort) published 2000-2004.
- Extraction of data on the characterization and content verification of the studied herbal supplements.
Main Results:
- Only 15% of 81 eligible RCTs reported content quantification tests.
- A mere 4% provided adequate data to compare actual versus expected herbal supplement content.
- Actual content in these few studies ranged from 80% to 113% of expected values.
Conclusions:
- Published RCTs inadequately document the characterization of herbal supplements.
- Lack of quality control in herbal products may undermine the value of clinical trials.
- Enhanced reporting of herbal product quality is crucial for future RCTs' scientific and clinical utility.