Are there supplements that are harmful for my liver?

Supplements. Steer clear of extreme excesses of fat soluble vitamins: a, d, e, & k. For any supplements, remember moderation and adequate hydration.
Yes. Yes, they can be. Any medicine or supplement can produce very rarely an unpredictable and severe reaction in people with a genetic predisposition. It is called drug -induced idiosyncratic liver disease and it can lead to acute liver failure.