(CNN)Actress Hayden Panettiere has revealed a battle with addiction that she says left her struggling at the height of her career.

Panettiere, now 32, was a fixture on television for more than a decade starting in 2006, when she landed a breakout role on NBC's "Heroes." She followed that up with a role opposite Connie Britton on country music drama "Nashville," during which she calls "tough years" in a new interview with People.