css, I had been told that by my dr and I read that on the synthroid site. I don't take either of these supplements at all because I am afraid of anything interferring.

Also, take your medication on an empty stomach, at the same time every day. I take mine first thing in the AM when I wake up, and wait an hour to eat. I do have my coffee right away though. I have often wondered if that would have any adverse affects, but am afraid to look that up!