Thyroid supplementation... does it suppress your natural Thyroid?

[BillyJ03z]

I've been searching all over the net and I can't get a solid answer.

I have only found one site (a medical site/doctor) that states that small doses of NDT from 15mg up to 60mg will not shut down your natural thyroid production... 120mg and up will however suppress natural Thyroid...

Does anyone have any info on this?