Hi, I bought both BCX Ultra’s from HYMBAS.com. Using them, several friends have gotten rid of parasites, & candida. One friend got rid of lung cancer; another friend got rid of liver cancer. I’ve also used it on myself for parasites as well as high blood pressure. Every one reacts differently. One gets headaches during the die off, another feels sluggish, and another feels nausea. I seemed to get headachy and sluggish. I usually do 4-5 frequencies at a time for 3 minutes each every other day for 4 times then switch frequencies. This way seems to be pretty effective.