The best replacement for saliva is human saliva.

The best alternatives to saliva are rated as following:
★★★★★  human saliva
★★★★  blood test for hormones
★★★★  blood testing for hormones
★★★  urine drug test
★★★  urine drug testing
★★★  sputum
★★★  phlegm
★★★  dog saliva
★★★  blood hormone testing
★★  sweat
★★  spit
★  blood hormone test
★  urine ph
★  indica
★  blood cortisol
★  spittle
  urine ovulation test
  urine test
  lube
  urine drug tests

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

Other search terms related to saliva and their ratings are:
★★★★★ hiv
★ taste
★ starch
You have in mind a companion for saliva and it is not yet here? Propose!



Google Trends

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saliva
human saliva
blood test for hormones