Consumers who turn to herbal supplements and natural health products often do so with the goal of reducing chemical exposures and supporting wellness through natural means. The irony is that many botanical supplements and functional health products may carry PFAS contamination — from the water used in extraction and processing to contaminated plant material grown in PFAS-affected soil. Understanding this hidden exposure route helps health-conscious consumers make more informed decisions.
How PFAS Enter Herbal Products
PFAS can enter herbal and natural health products through multiple pathways:
Contaminated botanical raw materials: Plants grown in PFAS-affected soil or irrigated with contaminated water can take up PFAS through their roots. Studies have shown that certain plant species — particularly those with high water uptake rates and short root-to-leaf transport distances — accumulate PFAS in their above-ground tissue. Herbs grown in agricultural areas near PFAS sources may carry measurable contamination.
Water-based extraction processes: Many herbal extracts, tinctures, and liquid supplements are produced using water as the extraction solvent. If processing water is PFAS-contaminated, the final product concentrates those PFAS as water is evaporated or reduced during extraction. Aqueous extracts of herbs — teas, decoctions, and liquid concentrates — are particularly susceptible to this pathway.
Encapsulation and tablet processing: Some pharmaceutical coatings and capsule materials historically used PFAS for moisture resistance and processing efficiency. While regulatory pressure has reduced this use, legacy materials may still be present in some manufacturing supply chains.
Packaging migration: PFAS-treated food packaging and supplement packaging can migrate into the product, particularly when products are stored in direct contact with treated paper or cardboard packaging materials.
High-Risk Product Categories
Based on known PFAS plant uptake patterns and processing considerations, certain herbal product categories warrant more scrutiny:
- Leafy herb extracts: Spinach, kale, lettuce, and similar leafy plants show relatively higher PFAS uptake; herb extracts from these sources deserve attention
- Root extracts: Many popular adaptogens (ashwagandha, valerian, echinacea root) are root extracts; roots show intermediate PFAS accumulation
- Aqueous herbal teas and concentrates: Water-extracted products from PFAS-affected agricultural areas
- Products from regions with documented PFAS agricultural contamination: Maine, parts of the Midwest, and regions near military bases with AFFF use history
The Lack of Regulatory Testing
Unlike pharmaceutical drugs, dietary supplements and herbal products are not required to undergo pre-market testing for PFAS or most environmental contaminants. The FDA’s oversight of supplement contaminants under DSHEA (Dietary Supplement Health and Education Act) is limited, and PFAS testing is not part of current Good Manufacturing Practice (GMP) requirements for supplements.
This regulatory gap means consumers cannot rely on labeling to assess PFAS content of supplements. Third-party testing programs — including ConsumerLab.com, NSF International’s dietary supplement certification, and USP Verified — test supplements for label accuracy and some contaminants, but PFAS testing is not yet universally incorporated.
Practical Steps for Health-Conscious Consumers
- Choose supplement manufacturers that explicitly test for PFAS in raw materials and finished products and can provide Certificates of Analysis
- Prioritize supplements from companies with transparent supply chains that source from PFAS-free agricultural regions
- Prepare homemade herbal teas using PFAS-filtered water to minimize this exposure route
- Focus primary PFAS reduction efforts on drinking water — by volume of daily intake, this remains the most significant controllable route for most people
As consumer awareness of PFAS grows, the natural health products industry will face increasing pressure to demonstrate PFAS-free sourcing and processing — similar to the “clean label” movement that has already transformed ingredient transparency in many supplement categories.