Hate this litigious society we seem to live in!
Basically I had a near fatal reaction to a herbal off the shelf product very recently. Literally every visitor I've had whilst recovering is adamant I 'sue' the manufacturers as they make no warning off this possible reaction in the leaflets that come with it.
I had no idea I was sensitive to this ingredient, so AFAIAC, its one of those things....and the stress of a lawsuit won't aid my already long, slow recovery!