Definitely! It does definitely mobilise mercury and probably other toxins also. It can also cause yeast die off to occur, which also causes symptoms. I've had them both and garlic has been absolutely potent and at times dangerous to me.

One ought to also be very careful with any sulfur amino acid containing food/supplement when they are very mercury toxic. E.g. cysteine, methionine, glutathione etc. It really does depend on how a person responds to these things. I'd always be cautious. Too much of a good thing can cause an eruption of intolerable symptoms in mercury, particularly when using any agent that can chelate/mobilise.