I agree, I think that supplementation is necessary. Mercury and other toxins deplete much needed nutrients/essential elements and diet is not always enough, particularly when such a high toxic burden is going on. Added to that, most of us do not eat organically grown perfectly ripened fruits and vegetables etc.

Sometimes just adding the right extra nutrients needed, it can be enough to boost detoxification and energy levels. I've experienced it myself. However, I'd not think it would be so effective if the person had not already improved/changed their diet first. Continuing to eat sugars, gluten etc, can, I imagine, undo much good that any supplement regime might have otherwise done.