The best replacement for sizeon is cellmass.

The best alternatives to sizeon are rated as following:
★★★★★  cellmass
★★★  green mag
★★★  superpump
★★★  xtend
★★★  monohydrate
★★★  dark matter
★★  cell tech
★★  celltech
★★  glycofuse
★  intrabolic
★  con-cret
★  superpump 250
★  superpump max
★  purple wraath
★  green magnitude
★  creatine monohydrate
  kre alkalyn
  cell mass
  mhp dark matter

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Speaking about sizeon, one probably shouldn't forget about superpump max.

Other search terms related to sizeon and their ratings are:
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