---
title: FDA issues notice on animal-derived thyroid products
description: The agency has indicated it will exercise 12 months of enforcement discretion to allow patients time to transition to FDA-approved therapies.
---

[APC News Feed | Stay Updated on Pharmacy Compounding ](https://a4pc.org/news)

# [FDA issues notice on animal-derived thyroid products](https://a4pc.org/news/fda-issues-notice-on-animal-derived-thyroid-products)

 Written by [Andrew](https://a4pc.org/news/author/andrew) | Aug 08, 2025

Yesterday, the [FDA sent a letter](https://a4pc.org/hs-fs/hubfs/2025.08.06AnimalderivedthyroidproductsFDAnotice.pdf?_hsenc=p2ANqtz--_cDO9PM1vW9Xq_vaSAmN2Z2thCSebMDfv5Yw9ujPpAVI3id71qMGNVyDWsrmJQFAlt_Yl) to manufacturers, distributors, and importers of products containing natural desiccated thyroid extract (NDT/ADT), including API used in compounded forms and commercial products like porcine thyroid, stating that these products are unapproved biologics and will be subject to enforcement.

The FDA has indicated it will exercise 12 months of enforcement discretion to allow patients time to transition to FDA-approved therapies.

APC is actively evaluating the letter and considering appropriate legal strategy. We will keep members informed.

Stay tuned for updates.

[View full post](https://a4pc.org/news/fda-issues-notice-on-animal-derived-thyroid-products)

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