Response to the FDA's August 2025 statement on Desiccated Thyroid

The FDA posted a statement last week warning about the use of desiccated thyroid (DTE), making unsubstantiated claims about DTE and stating they have “concerns with the safety and effectiveness of the unapproved animal-derived thyroid medications”. I find the discussion surrounding desiccated thyroid both perpetually fascinating and, at times, profoundly frustrating due to persistent misconceptions. The evidence surrounding the use of desiccated thyroid is quite clear and this recent statement made by the FDA provides very strong evidence, in my opinion at least, that the FDA does not base its guidelines on evidence-based research.