Selenium also is a cofactor in conversion of T4 to active T3.
So some IS needed. I would keep it at 100mcg a day by using the 200mcg only occasionally. As I figure it 325mcg a week (7 day period) would bring you up the the RDA.
So taking 1 of those 200mcg selenium a week would do it pretty closely.
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Weezie looking at petunias 8.25.2017
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