Guild Wars 2

I know the elementalist can get 3 different sources of endurance regeneration (4 if you count food), but never considered if endurance regeneration sources could stack or not.

They are not supposed to stack, they rate increases by largest multiplier.
-Player uses +40% endurance rate food and has vigor(+100%)
Total vigor rate is 200%, not 240%

Ahh, Thank you very much.

That would be consistent with the way speed boosts work.

as Lord Aargadon said.
I had natural vigor (adds 50% endurance) on my ranger then used Bowl of Orrian Truffle and Meat Stew (adds 40% endurance, gain might on dodge)
used that for like a month, then decided to test it one day. Results went something like this:
no natural vigor or Orrian Stew = took 10 seconds to refill from 1 dodge
add natural vigor = took 6.7 seconds to refill from 1 dodge
add Orrian Stew = took 6.7 seconds to refill from 1 dodge

if they stacked, the last one would of taken 5.25 seconds
I sold all my Orrian Stews after that :P the might was nice, but overall I preferred other foods if it wasn’t also adding more dodges/minute.