Thickening agents

I'm making a shampoo with a soapberry concotion. I planned on using xantham gum to thicken since the idea is to make a shampoo with no other surfactant. I heard xantham gum is incompatible with some preservatives. If I'm using caprylhydroxamic acid as the preservative, should I use a different thickener? Guar gum, perhaps?

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