myjo, I have a feeling this is an important caution for people first looking into heavy metal issues. The worse a person's detox pathways are, the more nutritionally rundown they are, and the heavier their load of metals, the worse they would do with chlorella or cilantro. They just wouldn't have any extra resilience, any wiggle room for dropped metals.
For people who aren't that messed up (to describe it bluntly), or who are very knowledgeable and very careful and who probably use other nutritional supports at the same time, my best guess is that they could have good outcomes. But for the typical person who's thinking they have a heavy metal issue and wants to get started, this would be a risky way to do it.
The frequent dose chelation yahoo group is dedicated to Cutler-style chelation, frequent, low dose using some combo of dmsa, dmps and ala. Plenty of people there have had significant issues with chlorella and cilantro and the like, but the typical person on the list seems pretty significantly impaired. I lurked for a while, and while I'd say I used to be moderately mercury toxic, and it's significantly affected my life and I can see the health and behavior effects in both my kids, I was better off than half the group at least, maybe 2/3.