FAQ #1 - Where exactly should one apply the patch? Would it interfere with other patches (estrogen) that one applies?

Apply the Insect DEFEND Patch to a clean, dry and hairless part of the body. A large muscle group such as the upper arm or one found on the shoulder blade provides for large capillary action allowing for the transfer of Thiamine (Vitamin B1) throughout the bodies Epidermal layer.

With all prescribed medication side effects are possible, even with Natural Health products, when taking more than one product at the same time. Consult with your physician before using both together.