Consumers are being warned about two U.S.-made brands of energy drinks after both were found to have been subject to tampering.

Health Canada issued a warning about Hardcore Energize Bullet liquid energy drink, which is manufactured in Pennsylvania and sold in Canada in vials.

The reason for the recall was because one vial was found to have been subject to tampering, Health Canada said.

The U.S. Food and Drug Administration, meanwhile, is also warning about Hardcore Energize Bullet, and about New Whey liquid products, as well. New Whey items are also sold in test-tube vials and consumed in a single shot.

A utility knife blade was found in one vial of each product, the FDA said.

No injuries have been reported, the U.S. agency said.

Hardcore Energize Bullet is packaged in 85.7-millilitre vials and comes in two flavours, Blue Rage and Black Rush, Health Canada reported on its website.

New Whey liquid products are manufactured and sold in the United States. The manufacturer for both liquid products, Protica Inc., of Whitehall, Pa., is investigating the tampering, the FDA said.

Consumers requiring more information in Canada can contact Health Canada's public enquiries line at 613-957-2991, or toll free at 1-866-225-0709.