Janetmarie, I share your questions about whether it's best to use a Rife machine or a zapper, or both. The reason I bought a less expensive Zapper (C3i) was so that I could be doing SOMETHING while I figured out what machines and protocol's would be likely to be ideal. I still don't know much about Rife machines -- what to choose, how they work, how they're used, if they're really needed if you use a high quality Zapper, etc. So I'm interested in any answers given to Janetmarie's questions here. Good luck to you, Janetmarie. And thanks to you all.