The best replacement for guar gum is xanthan gum.

The best alternatives to guar gum are rated as following:
★★★★★  xanthan gum
★★★  xanthan
★★★  amylopectin
★★  arrowroot powder
★★  psyllium
★★  gum arabic
★★  gelatin
★★  agar
★★  glucomannan
★★  carrageenan
★  wheat dextrin
★  psyllium husk
★  locust bean gum
  cellulose gum
  arrowroot
  xanthum gum
  inulin

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Speaking about guar gum, one probably shouldn't forget about xanthan.

Other search terms related to guar gum and their ratings are:
★★★★★ xanthan
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