The best replacement for avh is focus factor.

The best alternatives to avh are rated as following:
★★★★★  focus factor
★★★★  azg
★★★  avic
★★★  aeg
★★  constant focus
★★  prevagen
★★  brainalert
★  brain alert
★  excelerol
  kenwood ddx

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avh
focus factor
azg