This is all I could find on Elixir's potential:
http://en.wikipedia.org/wiki/Elixir_%28comics%29
"Elixir is an Omega-Level Mutant who is theoretically capable of manipulating all of the body's functions on the genetic level."
I assume that this includes his own, so theoretically he might could grant himself any mutant power or turn off the powers of other mutants. But who knows?