I think anything that mobilises/chelates mercury that is used incorrectly, too early, increases the risk for further uptake of mercury into the brain - risking damage.

Cilantro no exception - but it is likely much less risky if the person has first reduced their blood/body levels of mercury. Even then, it is not known how cilantro works in order to give a protocol for it to recommend it's safety in chelating mercury (As Andy has said). However, some people may not be able to get ALA or may respond poorly to it for whatever reason, could find cilantro to be a last resort - it may help, it may cause problems.

Either way, no brain chelator should be used apparently until blood/body levels of mercury are reduced first (safely as possible).

It is not known how everybody is going to respond to any given product/protocol, but there are warning signs when enough people have had horrible reactions and long term problems after using certain products/protocols that one would be wise to take note of. Which Andy has done and has even experimented on himself in order to find a protocol worthy of recommendation to others that has a trackrecord of safety/effectiveness and testimonies to back it up.

I cannot say that cilantro is going to hurt everybody that tries it. But as with any chelating agent, it's the timing/protocol that appears to have a big impact and I don't know of a protocol for cilantro that reduces redistribution whilst it is removing the mercury.