03/30/2026
FDA flags Quest Cat Food lots with near-zero thiamine (vitamin B1), urging vets and owners to act fast to prevent dangerous deficiency.
The US FDA is warning veterinarians and pet owners that 8 lots of Quest Cat Food contain extremely low or no thiamine (vitamin B1), an essential nutrient for feline health. The agency said continued feeding of the affected diets could lead to thiamine deficiency, which can cause serious illness and may be fatal if not recognized and treated promptly. The FDA also noted that only 3 of the 8 affected lots have been recalled so far.1
The advisory involves frozen and freeze-dried Quest Cat Food products marketed by Go Raw LLC doing business as (dba) Steve’s Real Food. The FDA said the affected products are distributed nationwide, and that testing confirmed all 8 lots contained thiamine levels far below the Association of American Feed Control Officials’ minimum cat food nutrient profile standard of 5.6 mg/kg.1-2
Clinical signs of thiamine deficiency in cats can begin with gastrointestinal abnormalities, such as decreased appetite and vomiting, but the condition can progress to neurologic signs, including ventroflexion, weakness, ataxia, circling, and seizures. The FDA said some cats may develop signs within a week, whereas others may not become symptomatic for months. The Merck Veterinary Manual similarly describes feline thiamine deficiency as causing vestibular signs, head tremors, ataxia, severe ventroflexion, seizures, and death if untreated.1,3
The FDA said it first learned of the issue after receiving a report from a veterinary neurologist about a cat with severe thiamine deficiency after eating one of the affected products. Additional complaints prompted further testing, which showed extremely low or absent thiamine in all 8 lots examined.1
The FDA recommends that owners of any of the affected products consult a veterinarian to determine whether to continue feeding it, and to stop feeding it immediately if a cat shows signs of illness.
Author(s)Bob Alaburda, Associate Editorial Director
Fact checked by: Yasmeen Qahwash