Products sold on drugstore shelves as gentle, natural wellness aids have climbed to become one of the most common triggers of serious drug-linked liver injury in the United States. Physicians tracking these cases through federal research networks now see botanical and dietary supplements implicated in a growing share of hospitalizations, and in the worst instances they have caused liver failure requiring a transplant or ending in death. The shift matters because the supplements involved are widely marketed as harmless, sit outside the strict pre-market approval that governs prescription drugs, and are consumed by tens of millions of adults who assume the “natural” label signals safety.
What the Drug-Induced Liver Injury Network has documented
The clearest picture comes from the Drug-Induced Liver Injury Network, or DILIN, a multicenter study group funded by the National Institutes of Health that enrolls and adjudicates cases of hepatotoxicity. Over the past three decades, herbal and dietary supplements have gone from a marginal cause of liver injury in the network to roughly one in five confirmed cases. The federal LiverTox database, maintained by the National Institute of Diabetes and Digestive and Kidney Diseases, catalogs the specific products and describes the pattern of damage each one tends to produce, from mild enzyme elevations to acute failure.
Because supplements are regulated as food rather than as medicine, manufacturers do not have to prove safety or efficacy before selling a product, and dosages, purity, and ingredient combinations vary widely between brands. That regulatory gap is part of why clinicians have struggled to warn the public: a bottle that lists a single herb may contain contaminants or multiple active compounds, and the same botanical can be far more concentrated in an extract than in the original plant.
Green tea extract, turmeric and the other repeat offenders
A handful of ingredients account for a disproportionate share of the reported harm. Green tea extract, taken in concentrated capsule form rather than as brewed tea, has been repeatedly linked to hepatitis-like injury. Researchers examining DILIN cases found that a large majority of patients with green tea-related injury carried a particular immune-system gene variant, HLA-B*35:01, suggesting a genetic susceptibility that makes the reaction unpredictable from person to person.
Turmeric, long assumed to be benign, has emerged as a growing problem as manufacturers reformulate it for stronger absorption. A case series published in The American Journal of Medicine described ten turmeric-associated liver injuries enrolled in the network, one of them fatal, and tied the increase to newer supplements that pair curcumin with black-pepper compounds or nanoparticle delivery to boost potency. Other agents that surface frequently include anabolic steroids marketed for bodybuilding, the weight-loss ingredient garcinia cambogia, kratom, ashwagandha, and complex multi-ingredient blends whose contents are hard to trace.
Why the injury is easy to miss
Supplement-induced liver damage often develops quietly. Early symptoms such as fatigue, nausea, dark urine, abdominal discomfort, and yellowing of the skin or eyes can be mistaken for a passing illness, and many people do not mention over-the-counter products to their doctors because they do not think of them as drugs. That silence complicates diagnosis, since a clinician trying to identify the cause of failing liver function may never learn about the daily capsule a patient has been taking for months.
The National Institutes of Health’s Office of Dietary Supplements advises consumers to treat these products as substances with real pharmacologic effects, to disclose everything they take to their health-care providers, and to be wary of megadose extracts and proprietary blends. Health authorities emphasize that stopping a suspected product early, before scarring becomes permanent, is often what separates a full recovery from irreversible damage.
The scale of exposure
The public-health stakes are magnified by how many people use these products. Surveys indicate that a majority of American adults take at least one dietary supplement, a market worth tens of billions of dollars annually. Even if serious liver injury remains statistically rare relative to total use, the sheer number of consumers means the absolute count of severe cases continues to rise. Reporting by outlets such as Medical News Today has amplified the DILIN findings, naming the specific botanicals most often implicated so that consumers can recognize them.
Federal researchers continue to publish updates through the NIH’s news and research channels, and the agenda increasingly centers on identifying genetic markers of risk, standardizing how supplement injuries are reported, and pressing for clearer labeling. For now, the practical message from hepatologists is consistent: a product being sold without a prescription does not make it free of consequences for the liver, and anyone taking concentrated herbal extracts should watch for warning signs and keep their physician informed.
How consumers can lower the risk
Specialists who study these injuries stress that avoiding harm does not require abandoning supplements entirely, but rather approaching them with the same caution applied to medication. That means favoring single-ingredient products over proprietary blends whose full contents are unclear, sticking to modest doses rather than concentrated megadose extracts, and treating any new fatigue, nausea, or yellowing of the skin as a reason to stop and seek testing promptly. People with existing liver conditions or those taking prescription drugs face compounded risk, because a supplement’s effect can stack on top of other stresses to the organ. The recurring clinical message is that the burden of proving a product safe often falls on the consumer, since the market itself does not do so before a bottle reaches the shelf.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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