For Vitamin D, the serum 25-hydroxyvitamin D test is recommended
American Journal of Case Reports
While the upper respiratory infection symptoms are basically the same as a human cold, a feline URI is not transmissible to humans
StatPearls [Internet], 2024 Jan Avinoam Shiran, Eric Remer, Ihab Asmer, Basheer Karkabi, Eran Zittan, Aliza Cassel, Mira Barak, Orit Rozenberg, Khaled Karkabi, Moshe Y Flugelman
Vitamin B12 5,000 mcg Methylcobalamin Highly Bioavailable Form of Vitamin B12 in a Berry-Flavored Lozenge for Healthy B12 Status, Neurological Function, Cellular Energy Metabolism, Cellular Repair, Detoxification Pathways, Cognition, Mood, Methylation, and Homocysteine Metabolism* Key Performance Benefits Supports healthy vitamin B12 status* Promotes neurological function* Supports healthy cellular energy metabolism* Helps support optimal cellular function* Promotes healthy detoxification pathways* Supports healthy cognition and mood* Supports healthy methylation and homocysteine metabolism* What This Product Is Vitamin B12, also known as cobalamin, is a water-soluble micronutrient essential for normal cellular repair and function, cellular energy metabolism, and neurological function