I have personally spent years real-life use testing different products for my German Shepherds. And I have also developed solid relationships with a number of breeders and veterinarians.
The products which I recommend for your GSD are based on my own (and my GSDs’) personal experiences, as well as the advice of professionals that have had real-life experiences with the products as well.
If there is an upside to a product, you will know. If there is a downside, you will also know that. The products which I recommend are based on the health, safety, and overall well-being of our GSDs being the foremost consideration.