@Gondwanaland: Do you know why did the Zn made you anemic? Were you tested, or was it your conclusion from symptoms?
I am surprised that 10 mg of zinc works so well for you, as I take 35 mg of zinc per day, and have for years now. Granted, the difference in our doses may not be as much as it seems, as I have read that the more zinc one takes orally, the less one absorbs. A higher dose is still a higher dose--just not as much of an increase as you would expect. Also, I take 10 mg manganese per day, which is supposed to interfere with absorption (I think?).
I learned recently metallothionein binds zinc...(See
this review of Zinc transport) I think more or less holding it until it is needed to make or shape proteins in the golgi aparatus and I believe the mitochondiria, but maybe doing other things too, I don't know enough. In any case nearly 30% of metallothionein is made up of cysteine residues (from Wikipedia, citing Sigel H, Sigel A, ed. 2009.
Metallothioneins and Related Chelators in
Metal Ions in Life Sciences) which as Rich pointed out so long ago, means it will have great difficulty being formed and properly folded. On the other hand, free zinc is supposed to upregulate the synthesis of metallothionein, so maybe the difficulty in synthesis could be overcome with more zinc, I am not sure.
Incidentally, I believe this theoretical issue with metallothionein is behind the MitoSynergy products, which chelate copper to niacin (metallothionein also binds copper), thus transporting copper to the mitochondria and bypassing difficulties with metallothionein. To be clear, the explanation I heard from the MitoSynergy people doesn't mention metallothionein, just that the active ingredient cunermuspir can be transported into and used by the mitochondria more effectively than other chelates. For whatever it is worth, cunermuspir worked for me where regular copper did not...I think the main difference was in a fuller range of emotions and appreciation for art and music. [Edit 1 & 2: I can't comment on changes to my energy level because taking copper and taking benfotiamine both ultimately feed the electron transport chain; cunermuspir gave me insomnia until I lowered my benfotiamine dose. Thus, cunermuspir was probably more effective at giving me energy, but since I didn't start with zero benfotiamine and zero copper, it was hard to tell for sure.]
All of this is to say that I am currently wondering if part of our problem with Zinc is due to inherent difficulty producing metallothionein when experiencing the kind of oxidative stress that we do.
I am going to try zinc skin creams to increase my zinc...we'll see how that goes.
I feel like this post is an incomplete thought. And although this theory about zinc and metallothionein would seem to suggest that everyone with ME/CFS has a big zinc problem, I am not sure that is actually the case. Nonetheless, I hope a half-thought is better than none at all.