Myasthenia Gravis Support Group
Myasthenia gravis (MG) is a neuromuscular disease leading to fluctuating muscle weakness and fatiguability. The hallmark of myasthenia gravis is muscle weakness that increases during periods of activity and improves after periods of rest. Although myasthenia gravis may affect any voluntary muscle, muscles that control eye and eyelid movement, facial expression, and...
The technical stuff:
Research study http://www.ncbi.nlm.nih.gov/pubmed/11814146 which says:
"in conclusion, supplementation with vitamin E and/or vitamin C might be useful in maintaining brain acetylcholinesterase activity at the normal level ... (bad for MG if it happened also in our neuromuscular junction)
We take mestinon (pyridostigmine) which is
"An acetylcholinesterase inhibitor (often abbreviated AChEI) or anti-cholinesterase is a chemical that inhibits the acetylcholinesterase enzyme from breaking down acetylcholine, thereby increasing both the level and duration of action of the neurotransmitter acetylcholine. Reversible, quasi-irreversible (or pseudirreversible in some sources) and irreversible inhibitors exist."
So I suppose Vitamin C and E might be a problem--but probably not muich of one.
Most of the research coming out nowadays shows that very high levels of just about any vitamin or mineral supplement is more harmful than helpful anyway--and that the normal requirements are really adequate unless we have deficiencies or our meds cause problems (i.e. prednisone and calcium). Most of us with MG have been told to take some additional vitamin D, and if our diet is poor, to take a multivitamin daily.