Hello! HCG is a hormone that we create when we are pregnant, technically it is called Human Chorionic Gonodotropin. They have made it into a homeopathic form so you can just put drops of it under the tongue. I got mine at the Rebekahspureliving.com website and the people there are so helpful! They have a chat feature on their website so you can ask them questions right from your computer! Very helpful! :)