The best replacement for force factor is no xplode.

The best alternatives to force factor are rated as following:
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★★  yok3d
★  no2 black
★  nitrocut
★  factor 2
★  jacked
★  ripfire
★  nugenix
★  jacked 3d
★  jack 3d
  no3
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  morph
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Speaking about force factor, one probably shouldn't forget about ramp up.

Other search terms related to force factor and their ratings are:
★★★★★ ramp up
★ jack 3d
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force factor
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