The Food Safety Authority of Ireland has asked retailers to withdraw a category of food supplements used in weight loss and muscle building.
In a joint warning with the Irish Medicines Board, the FSAI said the four supplements for sale in shops and online pose serious health risks.
OxyELITE Pro Super Thermo capsules; OxyELITE Pro Ultra-Intense Thermo capsules; OxyELITE Pro Super Thermo powder and VERSA-1 have been associated with severe liver disorders, including hepatitis.
There has been one case of non-viral hepatitis reported in Ireland.
The supplements contain an ingredient known as aegeline and are being investigated in the US where a large number of cases of non-viral hepatitis have been reported.
US authorities are investigating after one person died and a number of others required liver transplants.
An alert has been sent to Irish retailers to immediately remove the products from sale.
Anyone who has bought the supplements is advised not to consume them.
Director of Compliance at the Irish Medicines Board John Lynch said: "We believe people are seeking these products for a number of reasons including weight loss, energy boosting and muscle building.
"We seriously urge people not to buy or consume these as they can cause a significant risk to your health."