I put my prop at 1% and 16%. Gso is better imo. Everyone has their preferences though. I also use 100% eo or mix eo and gso together. Pharm grade uses .9%ba for most of their stuff. But they are made in sterile facility tho. I don't do your normal kitchen sink brew. I'm very sterile. So I know by trial and error that I can get away with lower ba Bb concentrations