Thought I'd pass on this information. I've noticed a new? brand of food grade NDT on the market: 'Thyrovanz'. It's in capsule form, from New Zealand cattle. It's classed as food grade, so no prescription needed. I know there are other brands out there e.g. 'Thyrogold' and 'Nutrimeds'. So I guess Thyrovanz is on a par with those.
Here'a their website for anyone that's interested: thyrovanz.com/
3.8.16 P.S. Since writing this post, I have found another whole thyroid glandular to add to the list:
'Metavive' by Procepts. They do porcine and bovine whole thyroid glandulars and are manufactured and sold in the UK: