If you take herbal supplements, you may be getting more—or less—than you bargained for. Product identity and accurate labeling matter because a substitute plant, contaminant or undisclosed filler can change both the expected effect and the risk.
Research using DNA analysis on 44 herbal products found that many contained substitute species, contaminants or fillers. Nearly 60 percent contained plant species not listed on their labels. One product labeled St. John’s wort, for example, instead contained Senna alexandrina, an ingredient that can cause diarrhea and may carry additional risks with prolonged use.
More than 20 percent of the products in that analysis had unlabeled fillers such as rice, soybeans and wheat. Undisclosed ingredients are particularly concerning for people with food allergies, intolerances or medical conditions affected by a product’s contents.
Natural does not mean risk-free
Botanical products can contain active compounds, vary from batch to batch and interact with medicines. Ask a pharmacist or qualified clinician to review a product in the context of your health history.
Studies have repeatedly identified inaccurate labeling among dietary supplements. Herbs present particular challenges because plants have complex chemistry, and manufacturing methods can make identification and standardization difficult. That leaves botanical products vulnerable to contamination or substitution.
A government investigation of retail herbal products also reported widespread discrepancies between labels and test results. Experts debated whether DNA testing alone was appropriate for every processed botanical product, since extraction and manufacturing can remove or damage detectable DNA. That methodological dispute does not remove the broader need for accurate identity, careful manufacturing and transparent labeling.
The practical conclusion remains buyer beware: a supplement label is not proof of purity, effectiveness or suitability for you. Avoid products promising cures or guaranteed outcomes, check the full ingredient list and discuss possible interactions before use.
Also see: Supplement Claims: What’s Allowed.
