This is why I keep banging on about magnesium......

[MrsNorris]

Very interesting thread this, as far as I've been able to ascertain, there's never been a reported case of hypermagnesaemia in a healthy horse caused by feeding it magnesium. I'm sure there's a huge lack of research too, but I've been feeding it for years without issue, and it does seem to help a bit with my EMS horses response to grass. As for it's calming or exciting properties, I have no interest in that and no opinion, it's not why I feed it, all I can say is that my own horse is totally chilled.

 

[tallyho!]

It's a book not a study - I included the full reference if anyone wants to check it out further.

Serum levels are pretty useless for magnesium unless there is renal compromise as most is quickly stored in the tissues or excreted. You would have to sample within 1 hour of giving the magnesium. Urine magnesium levels would be a good way of monitoring - if levels are pretty much zero it is being utilised, if levels rise you have reached an overdose.

So it's not even about horses?