Hi-
There isn't a set amount of levothyroxine - the dosage is based on an individual's TSH, T3 &T4. Her TSH should be as close to 1 as possible. I would encourage her to do a blood test every 6-8 weeks to ensure the dosage is accurate.
Soy can interfere w/ the uptake of the meds, so she shouldn't rely on soy as a big source of protein.
I've found this site helpful:
http://thyroid.about.com/
Be well,
Tracy Massillon, IBCLC
San Francisco, CA
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