I've got a couple question about research grade chemicals for human use. I've got research grade PGE-1 and POTABA right now. Both sources say that they're not OK for human use, but they're legally required to say that so it tells me nothing. Is there any way to find out if they're OK for human use, short of trying it myself? I've heard that certain lab chemicals are tainted to avoid human use. I know ethanol is, but that might just be an exception. Any input would be helpful.