What does NEW thyroid science have to say on the topic of thyroid pharmaceutical equivalency? How many micrograms of L-T3 Liothyronine (i.e. Cytomel) are equivalent to L-T4 Levothyroxine (i.e. Synthroid)? Thyroid hormone pharmaceutical monographs currently provide very rigid and low-ratio equivalency statements: In my previous post, I uncovered the historical origins of this low 25:100 mcg ratio in the product monographs. I showed that five authoritative publications promoted a higher average of 25 to 35 mcg L-T3 per 100-mcg L-T4. In this post, I will first review a set of groundbreaking articles from 2010-2013 that discussed this very issue of …