RLC labs who produce Naturethroid & WP Thyroid posted on 5th February 2018 that they are producing Naturethroid in 1/2grain, 1grain & 1 1/2grain tablets. Still no sign of production of WP Thyroid. They are saying the delay was due to trouble sourcing their raw materials & cost hikes. They are fulfilling long back orders. And they state there is no change to the formulas nor are they going out of business.
Link below:-