Do these stack?

[Dannorn]

Rolling up an Alchemist for a new campaign and thinking of going Master Chymist later. Just wondering if an Enlarge Person extract or spell would stack with the Growth Mutagen ability to make my character Huge? I know multiple castings of Enlarge Person don't stack but since Growth Mutagen is a supernatural ability as opposed to spell-like would it work, or is it just up to the GM?

Might never reach the level where it could come up just curious.

[MrSin]

Doesn't stack. Its 'as enlarge person'.

[Weirdo]

Enlarge Person wrote:

Multiple magical effects that increase size do not stack.

A supernatural ability is still a magical effect, so it doesn't stack with Enlarge Person (or any other size increase).