Re: this worked for me:

you bring good info.

there is a point of sufficiency and diminishing returns on high doses. still, the question is what is a high dose. i say that anything up to a gram a day is sustainable, but that can vary by individual to be anything in between 1mg and 1001mg.

i figured out one time that 100mg would be needed to keep the bad stuff at bay for an adult with major city exposure. the average intake in japan of 38mg in their diet is also a consideration for long term supplementation after sufficiency is achieved. so somewhre in there should be enough.

i still get the itches too when i up dose. since i dont know exactly what that is i keep it below that level for myself as well.