Giving mice a specific antioxidant called NAC for 8 weeks made the scarring in their heart blood vessels and tissue about 40-57% less than in mice that didn't get the antioxidant.

The antioxidant NAC made the heart cells in mice with heart failure produce about 30-40% less of the proteins that form scar tissue.

The antioxidant NAC didn't change the size of the heart muscle in mice with heart failure.

The antioxidant NAC didn't change the blood pressure in mice with heart failure, even though it reduced heart scarring.

Giving the antioxidant NAC to mice with heart failure didn't help their heart's pumping ability improve, even though it reduced some scarring.

The antioxidant NAC made the heart cells in mice with heart failure produce about 42% less of a marker that shows oxidative stress.