The Zapper works on an overall body muscular level. The Magpulser is for penetrating deep into specific areas like lymph nodes. They both are necessaery for successfully knocking out a systemic parasite/candida problem. I would combine the above with paragone/parastroy and Colloidal Silver
. You have to hit parasites and candida high, low, wide, and deep to really get rid of them. One unit won't do it all. Actually a good Rife machine might but don't have any experience with them. I have heard of others getting good results with a Rife machine. Big $ though. I guess if I had to choose only one I'd take the zapper first and then save up for a magpulser. Colloidal silver machines can be bought for as little as $20, not the best cs but will get you started.