well are you sure you have parasites?? and not dealing with something else? because like everybody else says Humaworm is top notch, i just ordered mine the other day, but i also asked for extra strength. Did you ask for this? another product you can try is Para-Sheild by Gaja Herbs or try Parasitin by Vaxa (which I am currently on) and have passed a worm or two...
Also if you do order humaworm again ask for extra strength to target a certain parasite, when i ordered mine i asked for extra strength for tapeworm/roundworm infection.