Hi Momcat7, It sounds like everyone’s advice here is excellent! I was just going to throw in that if you can’t tolerate Zyrtec, but are responding to antihistamines, I would talk to your doctor about starting Gastrocrom (a mast cell stabilizer). The better we can clear our gut of mast cells (or keep them from degranulating), the better absorption we’ll have. And Drats, apparently, we can show “normal” levels of magnesium in our blood, but intracellularly, we are still low, so the docs suggest magnesium supplements, no matter what our blood tests show. :ohh: