Deceptive business practices, questionable product
The company offers a discount on your first order, but the numbers are inflated so that you're almost paying full price. The website buries in the fine print that you are signing up for a subscription that you did not ask for. The following month, they will charge your card and ship product you did not order. When you attempt to cancel, they will tell you too late, it's already shipped.
As far as the product, both of my dogs (who ate absolutely not picky eaters) hate the taste and will not eat the vitamins, so I can't tell you whether it works or not.