Never needed to look anywhere but eBay! Would probably buy off facebook groups though and obviously local stockists. None of my local places have just the basic type.
It's split and currently on eBay. Any Facebook groups I could use? Barefoot or laminitis ones perhaps? I have used my local ones. Haven't put it on preloved yet - didn't think anyone would look there for magox - think its worth it?
Indeed, a bulk supply of magnesium and I broke a few of the bags. It is now weighed out into 1kg bags ready to send out and listed on eBay at £9 per kg. No idea on iron content I'm afraid. It is 99.7% pharmaceutical grade heavy magox produced for use as an excipient (I work in the pharmaceutical industry)