Thunderbrook UlsaX Prebiotic MashThunderbrook UlsaX Prebiotic Mash. A scientifically formulated, multiple prebiotic feed, including a patented fermented extract from Jerusalem Artichoke. Ulsa X supports the efficient functioning of the horses digestive system by supporting an optimal balance of beneficial gut microbes versus harmful species of gut bacteria. When fed in higher quantities Ulsa X can improve condition. Suitable for horses which require support to maintain
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