Some folks do use the homemade. I recently got my own Silvergen too. If I were going to use anythong other than sovereign, it would be my silvergen homemade silver. I would definitely not use any silver that was yellow - there is clumping going on there.
After talking with the doctor who created the silvergen, I feel it's just as pure as you can get. The stuff is very expensive and I personally think the silvergen is the next best thing. Silvergen allows for the quantities needed for me very inexpensively. However with lungs, I'd just rather have it as pure as possible. Maybe it's me though. Maybe others have a differing opinion?