[QUOTE=mrsD;957863]The only thing I have read is that people with hyperthyroidism, may become depleted of CoQ-10 because the hyper state
uses it up more quickly than it can be made.

I am hypo, and stable on my levothyroxine, and I never see
any negative effects from the Qunol I use.

I would not expect much of an interaction with it. But just be watchful for the first 2 weeks or so.[/QUOT

I have hypo also and I'm fine on my synthryroid. I will keep a watchful eye. Thanks!