I take colloidal gold regularly and swear by it. So does Luella May and so does my cousin. We can all tell a marked difference in our mood and mental focus. And yes, I am connected to someone who makes it - that is how I found out about it to begin with. He has a supplement company which sells a great many items, but I only recommend the ones I know to be beneficial.
Far fewer people use colloidal gold than do colloidal silver - no surprise, since colloidal silver is such a versatile single celled pathogen destroyer. But gold does have its benefits and followers, and in some instances - such as fighting cancer - it works synergistically with colloidal silver. It's mental enhancing ability has been proven in mainstream studies (in one study, those who took gold had their IQ's raised by 4 points over the placebo group).
A very small percentage of people are allergic to gold and it would not be a good idea for them to use it.