I am always moving,
but I never know where I am going.
I provide delicious flavor to food.
I can be read on many restaurant menus.
However, I am toxic.
I kill thousands of people every year,
However, it is difficult to survive in the wild without me.
Who or what am I?
Answer will only be accepted if it matches all of the conditions.
UPDATE - A new line was added (the 4th one). 3rd line was revised to be more literal.
UPDATE - updated 6th line to specify "people", to eliminate vagueness.
UPDATE - revised 7th line to be more literal and less vague, so I am sure someone will guess it now.
All lines are completely literal now.