Thank you, JCC.

I'll go to the link you provided. I appreciate it.

I failed in my original question to explain why I wanted to know.

I did a web page quite some time ago on Magnesium after I learned that it was nearly as hard to absorb as vitamin B12. I read, while doing research, that in order for our bodies to use magnesium that we take as a supplement, we have to have sufficient gastric acid... and failing that, that we should take it with hydrochloric acid or vitamin C.

I would guess that vitamin C works because it is ascorbic acid.

Well, off to read from the link you so kindly provided.

Here's the link to my magnesium page, "Foods-Containing-Magnesium":
http://www.health-boundaries-bite.co...Magnesium.html