this has nothing to do with mannitol or hives (well okay a little bit of hives at the end!), but since we went to leaky gut...
on leaky gut and zinc, in vitro
Zinc Deficiency Induces Membrane Barrier Damage and Increases Neutrophil Transmigration in Caco-2 Cells1,2
Alberto Finamore3, Mara Massimi4, Laura Conti Devirgiliis4 and Elena Mengheri3,*
2 July 2008.
Quote:
Zinc may contribute to the host defense by maintaining the membrane barrier. In this study, we questioned whether zinc deficiency affects the membrane function and junctional structure of intestinal epithelial cells, causing increased neutrophil migration... Zinc deprivation induced a decrease of transepithelial electrical resistance and alterations to tight and adherens junctions, with delocalization of zonula occludens (ZO-1), occludin, β-catenin, and E-cadherin. Disorganization of F-actin and β-tubulin was also found in zinc deficiency... Disruption of membrane barrier integrity led to increased migration of neutrophils. In addition, zinc deficiency induced an increase in the secretion of interleukin-8, epithelial neutrophil activating peptide-78, and growth-regulated oncogene-{alpha}, alterations that were not found when culture medium was replete with zinc. These results provide new information on the critical role played by dietary zinc in the maintenance of membrane barrier integrity and in controlling inflammatory cell infiltration.
zinc is low in ms patients (although often inside the "normal" range the level is not "optimal"), it is implicated in optic neuritis a common ms presenting symptom, and it affects membrane integrity (intestines, blood vessels, blood brain barrier). for starters
50mg zinc per day for MS patients!
HTH, although rather sideways from the original question
JL
ps: my manager came in from some outdoor work in december and said she was getting hives from her cold allergy. the ensuing discussion about herself and her family's various health issues pointed, from many different directions, to a lifestyle-based zinc insufficiency. i will have to check in with her on whether she started a zinc supplement in the last couple of months, and whether she has noticed any difference.