Hello, There are different views on this topic. I am in urgent need to know what to do. A week ago a hair test showed mercury & arsenic overload, likely due to ammalgams. I have not started any procedure specificaly targeted to this yet. But my feelings are that this explains (at least in part) my symptoms. A month ago I initiated B12 methylation support with methyl B12 and folinic acid, with mixed symptoms: improved ones and worsened others (particularly brain fog and cognitive are in the second group). Some say to avoid methyl form of B12 while on mercury poisoning, some say there is no proven risk of worsening mercury toxicity due to methylB12 intake. I stopped for one day methyl B12 intake but I felt very bad on fatigue and muscle pain the day after. I restarted methyl B12 the day after and got some relief from the latter symptoms (and small lunulae appeared again) but brain fog and cognitive symptoms worsened again.... Many thanks for sharing your experiences and advices. I feel like in a trap. Best, S.