Amit, I read Claus's letter the first time it was linked. Claus does say that magnesium can block potassium uptake. He doesn't offer any information about what concentrations of potassium might be blocked by what levels of magnesium. That makes it difficult to use the information. Roger Miller ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/