inquired about buying an over the counter supplement the vendor said they stocked, and they looked at me like a roach just crawled across their shoe. i had to be called back for an answer to my request to buy.they want to do a "work up" first. i've had my dog to 3 different vets in the last two yrs. to try and improve her thyroid situation, and you'd think their desire to help would outweigh their desire to earn.