A lawsuit recently filed in California, USA, claims some fish oil capsules sold as health supplements have illegally undisclosed and unnecessary high levels of contamination with polychlorinated biphenyl (PCB) compounds.

The lawsuit names eight makers and sellers of fish oil, shark oil, fish liver oil and shark liver oil supplements that have PCB contamination above the so-called "safe harbor" limits set for human PCB consumption under  California's Proposition 65 . That law requires consumers to be warned about such exposures.