Thanks Marshall,
Agar and agar-agar have been on my list of iodine containing food ingredients for a long time. I was certain they did contain iodine but had no reference for it other than my list of things to avoid, when possible (iodine containing ingredients, even iodized salt are frequently not listed on labels).
paula

Marshall Dudley wrote:

I thought the same thing, but when I checked a number of suppliers of agar agar,
I noted that they indicated that this was a good source for iodine.

http://www.vegsoc.org/info/gelling.html
http://www.bulkfoods.com/agar_agar.htm

Natural agar agar is unflavoured producing a firm, clear jelly and is rich in
iodine and trace minerals and has mildly laxative properties.

http://www.bulkfoods.com/agar_agar.htm

Perhaps the trace elements in agar such as iodine provide nutrients for the
cultures.  I was unable to find a chemical formulea for agar, just that it was a
polysaccharide complex called lentinan.

Marshall



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