Here are a few trusted businesses that I may refer you to or you can contact directly if it you want more information.
Standard Process Supplements
Standard Process pet supplements were created to provide each animal with targeted, essential nutrition that supports their quality of life.
For more information visit: https://www.standardprocess.com/brands/veterinary-supplements
MediHerb Herbal Supplements
Mediherb supplements offer healthier pets with formulas that draw on the latest scientific evidence, as well as centuries of traditional knowledge
For more information visit: https://www.standardprocess.com/products?brands=MediHerb