These are some 'natural' preservatives. I know the general consensus will be that these aren't suggested to use. But have any of you tried them and challenge tested? I was reading a thread from some folks of 9 years ago but no conclusive results were given. Naticide Biopein Neopein Suprapein I have already requested samples of these and plan to test them out ( microbial/ lab testing eventually). Just curious if any of you have info on them?