Protexin isn’t available in US but I can check with our Vet to see if they carry it.
Chewy has two other brands – Equa Holistics HealthyGut Probiotics for rabbits, and Brytin TheraBiotic 2X Probiotic Microbial Support for smaller critters (not only rabbits). They don’t show the labels so it’s hard to see what else is inside other than listed ingredients.
Brytin:
Pediococcus Acidilactici Nrrl B-50517, Saccharomyces Boulardii 1.0+ Billion Cfu�S*Colony Forming Units.
Other Ingredients: Microcrystalline Cellulose, Lactose, Dried Apple Pomace, Dried Apples, Brewers Dried Yeast, Dried And Pitted Plums, Dried Pineapple, Maltodextrin, Yeast Extract, Corn Oil, Silicon Dioxide, Magnesium Stearate
Equa Holistics:
Rice extract, Inulin, Dried Propionibacterium freudenreichii fermentation product, Dried Propionibacteriumshermanii fermentation product, Dried Enterococcusthermophilus fermentation product, Dried Lactococcus lactis fermentation product, DriedLactobacillus casei fermentation product, Dried Bifidobacterium longum fermentation product, Dried Pediococcus acidilactici fermentation product, Dried Pediococcus pentosaceus fermentation product, Dried Bifidobacterium bifidum fermentation product, Dried Bifidobacterium animalis fermentation product, Dried Lactobacillus brevis fermentation product, Dried Lactobacilus fermentum fermentation product, Dried Lactobacillus acidophilus fermentation product, Dried Lactobacillus plantarum fermentation product, Active dry yeast