oral chelating vs. chelation by injection

I've had trouble with heavy metals for sometime now. I've been using the Cutler Protocol for a couple of years, and my health has improved a lot.

I'm considering the possibility of going to a doctor for chelation injections. I'm just wondering if there's anyone out there who can tell me if chelation by injection is a good idea or not.

There is one particular concern I have. The closest chelation clinic only advertises the use of EDTA. My understanding is that EDTA is not effective against mercury.

Do you have any advice or suggestions about whether or not I should try chelation by injection or just continue with oral chelation?