Supplements are a recognized cause of liver injury
The liver processes most of what we swallow, including supplements — so it is also vulnerable to them. Clinicians track this under the heading of herb- and dietary-supplement-induced liver injury, a subset of drug-induced liver injury. The NIH maintains LiverTox, a database from the National Institute of Diabetes and Digestive and Kidney Diseases and the National Library of Medicine, that catalogs the liver effects of medications *and* 'selected herbal and dietary supplements' [1].
Products more often implicated
LiverTox includes entries for many supplements reported to injure the liver, among them [1]:
- Green tea extract (high-dose catechins) — see our focused page on [green tea extract and liver safety](/learn/green-tea-extract-liver-safety).
- Kava, comfrey, and chaparral.
- Black cohosh, ginkgo, and high-dose turmeric/curcumin (uncommon, but reported).
- Anabolic or 'muscle-building' products and some weight-loss blends, which are repeatedly flagged in the broader literature.
This does not mean these products commonly harm the liver — most users are unaffected — but they appear disproportionately in case reports.
Warning signs to know
Possible signs of a liver problem include yellowing of the skin or eyes (jaundice), unusually dark urine, pale stools, persistent nausea, right-upper-abdomen discomfort, and unusual fatigue or itching. These warrant prompt medical attention.
Who is at higher risk
- People taking high doses or concentrated extracts.
- People combining many products at once.
- People with existing liver conditions or who drink heavily.
- People taking medicines that also stress the liver.
Practical guidance
- Tell your clinician about every supplement, especially before procedures or if you have a liver condition.
- If you notice warning signs, stop the product and seek care; recovery is common once the cause is removed, but not guaranteed.
- Be skeptical of 'detox' and rapid weight-loss blends with long, exotic ingredient lists.
- 'Natural' is not the same as 'gentle on the liver' — even widely sold products can carry risks [2].