Nutritional supplement adjuvant in the treatment of feline idiopathic cystitis. Rx Felvital® UT provides the essential components to support the regeneration and maintenance of the bladder’s protective glycosaminoglycan (GAG) layer. It also contains L-Tryptophan, a precursor to serotonin, a neurotransmitter that helps regulate susceptibility to stress, which,
when chronic, can cause functional and structural changes in the bladder.