This is directed at several folks on this forum who are following the Amino Acid therapy of Dr. Hinz for PD. It recommends a daily dose of 300-600 mg of vitamin B-6. But this is risky. It exceeds the Tolerable Upper Intake Value (UL) of B-6, which is
100 mg/d for adults over 50. With chronic doses above this limit, one runs the risk of neuropathy (nerve damage).
So far, knock on wood, I have avoided the burning or tingling sensations that signal neuropathy, but what woke me up is a blood test ordered by my neurologist. They found my B-6 value is more than double the top value in the normal range (20-125 nmol/L). You can bet I will immediately cut back on this vitamin! (But, for now, I plan to continue following the rest of the Protocol.)
If you know anyone on the Hinz protocol for PD, please urge them to at least have their B-6 level tested. You may save them a heap of trouble.