That's "a component of", not the venom itself. Same way that digitalis is "a component of" foxgloves, but someone with angina would not be best advised to go out and eat foxgloves - they might get a bit too much! Or vice versa, some of the components of coffee which are discovered to be good for you but where you'd need dozens of cups a day for it to have any effect, at which point you'd be a whole lot worse off from caffeine poisoning.

Graham.