I take a calcium, magnesium, zinc table twice a day. I didn't realize the calcium blocks the absorption of the magnesium. Why do you think they put them together if that is the case?

I also have pernicious anemia & used to take monthly B-12 shots for it. Doc now has me on 2,000 mcq of it orally daily (due to new research that says this is helpful) & my blood tests have been normal. Pernicious anemia causes depression (I have bipolar too so I really didn't need that), fatigue, memory loss & if not treated in the long term it can cause insanity so it is very deadly (which is what pernicious means). It was found through blood tests at my yearly physical. My husband claims they didn't catch it in time, because I've reached the insanity stage!