That is one source as is coral and egg shells. But I think the more common 
source is minerals such as Dolomite. 
- Steve N

________________________________

From: jessie70 <[email protected]> 
To: [email protected] <[email protected]> 
Sent: Sun Dec 13 18:35:58 2009
Subject: RE: CS>Speaking of Migraines.... Rennies and Tri-salts 


is carbonate from shells? Jess

        -----Original Message-----
        From: Norton, Steve [mailto:[email protected]]
        Sent: Sunday, December 13, 2009 11:52 AM
        To: [email protected]
        Subject: Re: CS>Speaking of Migraines.... Rennies and Tri-salts
        
        


        Dolomite powder might work the same as Rennies. It is basically Calcium 
Carbonate and Magnesium Carbonate but with a higher percentage of magnesium.
        Per teaspoon of Dolomite:
        Calcium carbonate - 1100mg
        Magnesium carbonate - 630mg
        
         - Steve N
        
        ----- Original Message -----
        From: Lisa <[email protected]>
        To: [email protected] <[email protected]>
        Sent: Sun Dec 13 09:09:43 2009
        Subject: RE: CS>Speaking of Migraines.... Rennies and Tri-salts
        
        What are Rennies and where can you buy them?
        
        L
        
        -----Original Message-----
        From: Rowena [mailto:[email protected]]
        Sent: Sunday, December 13, 2009 3:00 AM
        To: [email protected]
        Subject: Re: CS>Speaking of Migraines.... Rennies and Tri-salts
        
        I suspect the electrolytes could be important.
        Anyway, today DH is not doing so well, and I made him a drink to
        hopefully stave off progress to full blown migraine.
        With recent correspondence in mind, I added some ACV and honey.
        He's had no improvement, and I have given him another dose of
        bicarbonate of soda.
        
        It has all reminded me of something else . . .
        An old lady told me about 35 years ago that her daughter took Rennies
        whenever a migraine threatened, and it was fixed forthwith.
        I didn't do anything much with that information until some 15 years ago
        when we were miles away from home (on the seafront at Seascale) and DH
        was threatened with a migraine bad enough to have us stranded there.
        Four of us in a small car, with nothing in the car but a tube of
        Rennies. I remembered the old lady and her daughter, and DH took a
        Rennies, how many I don't recall.
        Much to my astonishment only a short while later - a ridiculously short
        time later - he said he was better.
        We continued our tour as if nothing had happened. Well, nothing had.
        
        DH just told me that last time we visited the UK he spent his loose
        change on as many packs of Rennies as he could, and he used to take
        those whenever required as long as the packs lasted.
        
        I just checked the ingredients of Rennies - Calcium Carbonate and
        Magnesium Carbonate.
        Calcium carbonate 680mg
        Magnesium carbonate - heavy 80mg
        Contains sucrose
        Contains saccharin sodium (Pity about that).