The head of the import and export department at Sriprasit Pharma writes in reply to my email of December 9:
"Thank you for your mail.
It has been necessary that we change the source of thyroid extract used in our manufacture of Thyroid-S.
We have found a new source. However its price is far more costly than that of the former one. We would have no other choice but to bring in the raw material from this new source.
Resulting from the substantial increase of the production cost, we will have to adjust the selling price of Thyroid-S very significantly. However, the new price has not yet been determined.
Furthermore, we will do Thyroid-S, using the new source of thyroid extract, in bottles of 500 tablets only. The bottles of 1,000 tablets will no longer be available.
We cannot yet confirm when the new production of Thyroid-S in 500 tablets will be available. We estimate that they will be ready in March 2020.
We are optimistic that Thyroid-S will be available continuously. Please do no worry.
Thank you for your continued support for Thyroid-S, we look forward to hearing from you."