Hm...never heard of Epsom salt baths for not eating...but be careful with some of the things that people at the LFS tell you, I have heard some pretty crazy stuff from them...
I personally have never had a need to use it so i'm not completely sure but it is just a concentrated garlic formula that you can mix with any food. Here is a link https://www.petco.com/shop/en/petcostore/product/seachem-garlicguard