Modiflan is heads over heels better than chlorella IMO. Yes I take chlorella as a vitamin supplement. But the best chelator I've ever used is Modiflan. I took 6 vcaps a day for 4 months the first time, then 2 years later 2 months. It is number 1 as far as I am concerned, My urine test showed clear of heavy metals after supplementation. I read about it in my catalog that I ordered macrobiotic foods from and gave it a try. When I find something that works after all my years of researching and trying different health diets and supplements, it sticks. We are exposed to so many toxins and heavy metals, I will probably use it once for a couple of months every year or two now.
Here is a website with some doctors opinions on it.

http://www.modifilan.ro/h/en/modifilan_doctors.html

More info on modiflan here, you can do a search and look for the best price. I just gave these as info to know more about it than my perspective.

http://www.bodyworks.com/modifilan.html