Can anyone advise me on whether NDT has to be prescribed? I have mentioned it to my GP and they will not consider or prescribe it and just blarts out negativities and 'risks' about it. If anyone does take it without peescription and gets good results, which brands are best? I have read that there are superior brands to Armour but have no idea. I have read Thyroid for Dummies written by a U.S MD who feels that NDT is better for most people.