Popular healing herbs can quietly soak up toxic pollutants
Shukla P, Gupta P, Singh A, Singh N, Maurya A
Medicinal Plants
If you grow basil, mint, or ashwagandha for tea or remedies, the soil they're planted in matters as much as the plant itself, since these species readily pull lead, cadmium, and pesticide residues up through their roots.
Researchers reviewed decades of studies on five common medicinal plants, basil, mint, licorice, periwinkle, and ashwagandha, and found that pollution from industry and farming doesn't just sit in the soil around them; it gets absorbed into the leaves and roots people use for herbal remedies. That contamination can weaken the plant's healing compounds and, over time, build up in the bodies of people who drink the teas or take the supplements regularly.
Key Findings
Reviewed contamination pathways for six heavy metals (lead, cadmium, arsenic, mercury, chromium, nickel) and pesticide residues across five widely used medicinal plant genera
Pollutant uptake was shown to disrupt plant physiology and reduce production of therapeutic secondary metabolites in a species-specific manner
Existing human health risk tools (Estimated Daily Intake, Hazard Quotient, Hazard Index, Cancer Risk models) are rarely applied to habitual herbal product users, leaving a regulatory gap
chevron_right Technical Summary
Many popular medicinal herbs, including basil, mint, licorice, periwinkle and ashwagandha, can absorb toxic heavy metals and pesticide residues from contaminated soil, weakening their healing compounds and posing health risks to the people who consume them.
Abstract Preview
Original paper
Heavy metals and pesticides in medicinal plants: environmental sources, plant responses, and human health risk assessment.
Medicinal plants have served as the foundation of healthcare across cultures for centuries, yet their safety is increasingly undermined by heavy metal and pesticide contamination driven by industri...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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