So far, it is not known to be physically addictive, and one study found it had very low toxicity, even at megadoses to which humans are not generally exposed.
Of course, megadose vitamin therapy has its detractors, and those who question its validity, but talking to people at the forefront of nutrition had left me convinced of its benefits.
There is evidence that hearing loss can be minimized by taking megadoses of magnesium for a few days, starting as soon as possible after exposure to the loud noise.