Herbs like cilantro can be very beneficial. They have a capability of binding out toxic metals like mercury and can help remove those from the body. The caution is that if you are very very sensitive to these metals, they move them out of privileged spaces and float them in your blood and possibly if you have enough damage to your blood-brain barrier, into your brain as well. So you need to know where you are in terms of your toxicity and your body load and your blood-brain barrier to know how to use these herbs for your benefit and make sure that they don’t cause problems.