Here at Mullum Minerals we are committed to sustainably sourcing the purest, highest grade ingredients insuring optimal mineral therapy practises. That's why when it came down to sourcing the best possible Magnesium for the job we had no choice but to choose Zechstein... You want to understand the reasoning to our logic? Click through and find out a little bit more about the incredible Ancient Zechstein Sea and why it's the. best choice for your Mineral Therapy routine.