I take B-12 tablets daily that I purchase at Walmart. When you have a queston like this, I suggest you consult youe pharmacist.

I used to take a vitamin B12 per my primary care physician for fatigue but did not see any improvement. I stopped it after letting my pcp know there was no change in the fatigue. During my next visit with him I said I knew that insufficient B12 could cause fatigue but was curious what my level was. On my way out of the appointment I had it checked and after 2 months of not taking the supplement my B12 was in the normal range. Also found out that Medicare doesn’t cover the amount for B12 testing! Not an expensive test but given the recommendation from Doctors to take additional vitamins, makes you wonder. I do go through testing for magnesium and liver test frequently as well as renal sufficiency’s since the immune system is compromised. So far everything is ok.

I take B12 supplement but now I'm wondering if the magnesium in them is too much because food contains magnesium. I wasn't aware until I saw this post and article re magnesium.

My b12 1000mg has no magnesium in them - they are nature’s made.

My b12,was 312 which is in the green meaning normal in my bloodwork however my primary said we like it between 700-800 when you have MG.

I need to look at my pills now to see if magnesium is in it.