The best replacement for b5 is b6 s4.

The best alternatives to b5 are rated as following:
★★★★★  b6 s4
★★★★  b5.5
★★★  lmt sopmod
★★★  b6 a4
★★★  b6
★★  b50
★★  a5
★★  accutane
★  b2k
★  pantothenic acid
★  b5m
★  ds9
★  b6 audi
★  22 2.0
★  magpul
★  b50 bigsby
★  b6 passat
★  losi 22 2.0
★  b7 rs4
★  mindless behavior
  b4.2
  b5 5
  b5 5 passat
  breeding 5
  b3
  bsg
  breeding5

Your alternative for b5 is not listed? Suggest!
Speaking about b5, one probably shouldn't forget about b complex.

Other search terms related to b5 and their ratings are:
★★★★★ b complex
★★★★ biotin
★★ p diddy
★ bad boy records
★ all i do
choline
You have in mind a companion for b5 and it is not yet here? Propose!



Google Trends

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b5
b6 s4
b5.5