What is the difference between WP-thyroid, Nature-thyroid and Armour?

WP Thyroid is the purest of the three and, along with Nature-Throid, is hypoallergenic and does not contain any dyes. Armour uses dextrose (corn starch) as an inactive ingredient and is dyed white with titanium dioxide. You can view our comparison chart to see the differences side-by-side.