OK, just figured that out as I ordered 2 Ultraphos at $11 shipping! No problem, these will get me started. No, no stopping for me. I'll keep the stuff coming. The Standard Process Wormwood is protocolled (as is the Zymex2 as per Dr. Sutter) to give a break in between to allow eggs to hatch. Humaworm is 30 days straight. So there's a bit of controversy here...not sure which to follow. ???