Sam, Is your MG getting worse? For a doctor to point to a relatively harmless vitamin (in small quantities) as a reason for that should scare you!!!! There are other, more common, reasons why someone with MG would get worse like not enough/right medications, a new thyroid or other condition, etc.

Maybe you should see your primary doctor to talk about checking some basic things like thyroid to make sure nothing else has changed.

Like Mrs. D. said, we need magnesium. Yes, high doses of it can cause a myasthenic crisis. And, yes, vitamins are not regulated by the FDA but there are still guidelines for them.

If you are eating a balanced diet, you may not need a multivitamin. Talk to your primary doctor about that too.

Again, please get help if your MG is getting worse. And if your doctoring is getting worse, please seek out a 2nd opinion from another neurologist!!!

Annie