Search for someone who has already taken them you trust the most, and ask where to find/buy (the same part they buy). Know what are you taking (as much as possi

Search for someone who has already taken them you trust the most, and ask where to find/buy (the same part they buy). Know what are you taking (as much as possible), read a lot about it on the internet, specially if you suffer from some chronic illness or are genetically predisposed to something (e.g. heart attacks). Only consume them surrounded by friend(s) in an known place, not with strangers, have water ready (maybe food too); if you have no friends around do the minimun dose at home (perhaps with music), have a medikit around if you are feeling paranoid about it. Fir time take only the minimum recommendation or so, try to have at least one friend around who will stay sober, don't take more if you don't feel anything; better to not combine with alcohol or other drugs.