One of the basic rules of jurisprudence is that originally things are permitted unless proven otherwise.
Therefore, everything is halal unless we have reasons to declare it as haram.
Add to this the following information about the product you have asked about:
“Xanthan gum can be verified as vegetarian or vegan by producers. Xanthan gumcan also be halal and kosher certified. A: Yes. Xanthan gum is used in many gluten-free foods to create the texture and suspension that gluten often provides.”
In light of this, there is no reason to declare it as haram.
Almighty Allah knows best.
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