Hi, I was on Fred's protocol for 7 months till Nov' 2012. So I have a fair idea about B12. My health is better now and I haven't taken B12 for 4 months or so. 3 days back I took 1000 mcg of Enzymatic Therapy MB12. I thought I'd take it every week or so,you know, as a maintenance dose, so that I'm always at the upper limit of the flawed serum B12 test. Anyways,my concern is that after I took that B12, I've been experiencing significant loss in energy(both physical and mental),muscle pain and light spasms,no refreshing sleep and it feels that I can't even get out of bed. Now, as per my previous knowledge, it seems like potassium is needed, as this could be B12 induced hypokalemia. I haven't got a test done,so it's all speculation. It's quite hot and humid here and I sweat A LOT. So, I took B12 3 days back, and have taken about 600 mg of potassium and some magnesium after I got these symptoms. Should I keep taking potassium? Or could it be another issue? Thanks. Regards, arx.