Unfortunately, testing for heavy metals, mercury in particular, is confusing, somewhat expensive, and not all that accurate.
I know very little about hair testing, but from what I know about heavy metals, they are stored in the body, and kept out of circulation as much as possible. It stands to reason, that they would only show up in the hair if they are presently in circulation?
Of all the methods I’ve looked at, hair testing seems the most accurate/reliable. How much hair is involved, how large of a patch? And i have to wonder, with the information received depending on the lab, the interpretation, and the sample, how valuable the information really is. I suppose that depends on who is using it, and for what.
Cilantro and chlorella or spirulina are well-researched and effective.
Also consider that the skin is the largest organ of detoxification. Infrared sauna or sweat lodge will move a lot of toxins, but you need to replace electrolytes.
But here is a big one I have just started researching:
It was used after Chernobyl to effectively chelate cesium from poisoned kids. It's cheap, non-toxic and gently cleanses. Easy to extract pectin at home from citrus peels.
Or just make sure you always eat the white part of any citrus peel. It is 30% pectin. It isn't exotic or expensive, so you won't see much press on it.
You asked if there was any reliable studies done on Heavy Metal detox.
My wife and I can across a site, and came across the following information about a clinically proven detox for heavy metals which is 100% natural. It is the result of 3-year long clinical trials with 350 people that cost over $1 million. The products name is called HMD for Heavey metal detox and has a patent pending.
My wife and I live in Southern Spain and we both took the product and both have felt more energetic and after we saw all the testimonials on the website, and having taking it ourselfs, we highly recommend it. I believe there are several websites that offer this HMD product but one which you can try is detox-heavymetal.com Well best of luck and God bless Tom