advanced nutrients and another company based in california are the only 2 companys that test products on buds marijuana mary jane specicificially i have used tarantual and a shitty bad seed turned into a plant that gave me an easy 3 ounce harvest and the rest barly 1 1.5 5 ft plants also invest in there big bud to get them huge the way they designed that is blood bud big bud then overdrive and if your not double harvestin final phase to get the grow nutes out the buds so the smoke is purer canadians have the most potent plant now at 50% and these guys are the technical people for the tv show weeds worth it they know there shit