Yes and No. While the most recent studies do say that high dosages of antioxidants can suppress the immune system, I'm sure another study will say the opposite in 6 months.

I think people should target what their most pressing need is. Cholesterol, Diabetes, High blood pressure, etc... and supplement specifically for these things in high dosages. But not in general because it's expensive and your liver and kidney's have enough to worry about.

I say juicing is the best. Just look at Jack La Lane