You could try using about 1-1/4 tsp guar gum, although it's generally the first thing in a conditioner recipe, so I'm not sure how it would integrate with an existing conditioner. You could also try gelatin, which has strengthening properties, but again, I'm not totally sure how it would integrate with an existing conditioner.
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I'm interested in making my own soap and shampoo bars, but my young son is allergic to all nuts and possibly to coconut. Is there a recipe I can use or