Does soy interfere with absorbsion of levothyroxin?

Soy / levothyroxine: Administration of levothyroxine at the same time with a soy protein dietary supplement results in decreased absorption of levothyroxine and the need for higher oral doses of levothyroxine to attain therapeutic serum thyroid hormone levels. Make sure to separate administration times by at least 2 hours to avoid interaction. Check with your provider on your thyroid hormone levels regularly.