before getting into growing..I studied alot of supplements, mammoth P being one of them. The grows and the testimony were really great..some more research and found that Mammoth p contains... Comamonas testosteroni... Not good stuff at all, Human pathogen. Read some case studies about this pathogen...wicked organism. That was enough for me to decide not to use it. Not knocking Mammoth P , I just dont want to handle something that can cause some serious problems.