The best replacement for enhancer is promoter.

The best alternatives to enhancer are rated as following:
★★★★★  promoter
★★★  sealer
★★  infinifolders
★★  pendant
★  activator
★  vital wheat gluten
★  wedding band
★  promoter proximal element
★  map sensor enhancer
★  response element
  dough conditioner
  operator
  tone compressor
  inducer

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Speaking about enhancer, one probably shouldn't forget about sealer.

Other search terms related to enhancer and their ratings are:
★★★★★ sealer
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Google Trends

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enhancer
promoter
sealer