"Doing a more frequent dose seemed to help with some of the symptoms, but the rashes are nearly unbearable at times."

some authors claim that the rashes result from the body trying to get rid of mercury through the skin. Unless the rashes are severe or very uncomfortable, perhaps the rashes should just be tolerated as an expected side effect of chelation. Chelation often gives me mild headaches. I don't mind these so much as long as they don't become severe.

I am starting to think that vitamin D is very important for mercury detoxification. To use vitamin D properly, the body needs the following cofactors

magnesium
zinc
vitamin K2
boron
a tiny amount of vitamin A

http://www.vitamindcouncil.org/

Just $2.75 per 50 mg capsule of DMPS sounds very cheap. Some posts I read talked about prices of 10-15 cents per mg.

Many who don't get well using the Cutler protocol may have difficulty making glutathione. It also seems to make sense to me that if someone is very sulphur deficient their body might break down the chelators in a desperate search for sulphur, and the chelators won't chelate.