Thank you for your questions. We reached out to manufacturer and they sent along this message for you:
All VetriScience® (VS) products are manufactured in the United States using the highest quality domestic and imported ingredients. Any raw material used in a formula, regardless of the country of origin, must be verified by using an appropriate method of analysis before it is used.
A few of our raw materials do come from China. Many of these ingredients sourced from China are commonly found in top pet food brands. Certain ingredients in animal health products such as glucosamine and vitamin C can be extremely difficult to source from any other country.
The number one priority of VetriScience ® (VS) is the safety of pets. FoodScience Corporation, the parent company of Pet Naturals, is a founding member of the National Animal Supplement Council (NASC). We are routinely audited by NASC, FDA and NPA. The NASC requires members to comply with human dietary supplement cGMPs, therefore many of the raw materials used in our pet products are of such quality that they are also used in human products.