The best replacement for b complex is b12.

The best alternatives to b complex are rated as following:
★★★★★  b12
★★★★  super b complex
★★★  multivitamin
★★★  biotin
★★  b6
★★  b100
★  vitamin b12
★  b12 shot
★  b12 which is better
★  b complex
★  just b12
★  b 50
★  b50
★  b vitamin
★  b12 vitamins
★  neurobion
★  b2
★  b12 injections
  multi vitamin
  vitamin b
  b 12
  b12 complex
  b3
  stress b complex
  b-12

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Speaking about b complex, one probably shouldn't forget about b12.

Other search terms related to b complex and their ratings are:
★★★★★ b12
★★★★ folic acid
★★★ biotin
b5
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b complex
b12
super b complex