I was surprised to see the subject title, since I have been giving my husband 3 drops a day while he is on the medication.
History they removed (partially?)his thyroid when he was 6 (now 61) since he was hyperactive!
3/4 years ago he was changed to synthetic meds. Since they did a test every few months I was able to experiment 1 drop at a time, up till 3 drops every time they had to lower the medication, but then with 4 drops they said he was hyper.
Went back to 3 drops and now it is ok. I have not changed anything anymore since he is not into alternative health
and he is ok with taking the 3 drops daily.