The best replacement for b1 is b12.

The best alternatives to b1 are rated as following:
★★★★★  b12
★★★★  b2
★★★  b52
★★★  b2 bomber
★★  b1/b2
★★  tu 160
★  a1 tooth color
★  thiamine
★  amx 40
★  b3
★  combat b2
★  fitbit force
★  dw2
  a1
  l1
  thiamin
  b6
  asus memopad
  c1
  as b2
  vitamin b12
  cambridge audio s30
  omega x33
  paradigm atom

Your alternative for b1 is not listed? Suggest!
Speaking about b1, one probably shouldn't forget about thiamine.

Other search terms related to b1 and their ratings are:
★★★★★ thiamine
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Google Trends

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b1
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