I am about to do my first parasite cleanse and trying to decide what herbs to purchase. I purchase a lot of my supplements from iherb.com, they have a huge selection of different brands at very good prices. So I am tying to decide if bying Wormwood /black walnut/clove combo from Clarkia which is more expensive or the exact same 3 herbs from a different company for less? 'Now' has the mixture of these herbs for only $8 a bottle. My dilema is, are the Clarkia herbs really more potent and effective as she claims than the same thing from a different company? I'd like to purchase a cheaper alternative since it seems to be a same thing. But I want to make sure they are effective. Can the difference in potency be really significant? Thanks.