Normal labs don’t always mean optimal function.
If you still feel tired, foggy, inflamed, moody, or stuck with weight gain despite being told everything looks fine, your symptoms deserve a deeper look.
Published: August 2025
By: Zhanna Tarjeft, Board Certified Family Nurse Practitioner, Functional Medicine Practitioner
What’s Happening With Natural Desiccated Thyroid?
If you take Armour Thyroid, NP Thyroid, Nature-Throid, or any other natural desiccated thyroid (NDT) medication, you may soon see big changes.
On August 6, 2025, the FDA issued warning letters to manufacturers of animal-derived thyroid medications, citing that these products:
- Have never been formally FDA-approved under current drug regulations.
- May have inconsistent potency from batch to batch.
- Could contain impurities or contaminants.
- Use “grain” labeling that isn’t standardized.
The FDA has announced a 12-month enforcement discretion period before they begin removing unapproved NDT medications from the U.S. market.
Who Will Be Affected?
About 1.5 million Americans — roughly 6% of all thyroid patients — currently take NDT medications.
For many of these patients, NDT works better than synthetic T4-only medications (like levothyroxine) because it contains both T4 and T3.
This can be crucial for people who don’t convert T4 to T3 efficiently, helping to restore energy, metabolism, and brain function.
Without access to NDT, some patients may see the return of symptoms such as:
- Fatigue and low energy
- Brain fog and difficulty concentrating
- Hair loss
- Constipation and slow digestion
- Unexplained weight gain
- Low mood or depression
Why Is the FDA Taking Action?
According to the FDA, this is about safety, quality control, and consistency.
NDT has been prescribed for decades, but the agency says these products haven’t undergone modern approval testing to confirm:
- Exact dosing consistency in every batch
- Absence of contaminants
- Standardized labeling for dose measurement
While many patients tolerate NDT well, the FDA states that more consistent, FDA-approved synthetic options are available.
Your Next Steps as a Patient
- Talk to Your Provider Now
Don’t wait until NDT is off the shelves — schedule an appointment to discuss a transition plan. - Explore Your Options
Alternatives include:- Levothyroxine (T4)
- Liothyronine (T3)
- Custom-compounded T4/T3 from a reputable pharmacy
- Monitor Closely
If you switch medications, work with your provider to monitor both lab values and symptoms during the transition. - Stay Updated
Timelines can change, and sometimes patient advocacy influences policy.
Bottom Line
The FDA is not banning Armour Thyroid and other NDT medications immediately — but the clock is ticking.
You have 12 months to prepare, make a plan with your provider, and ensure your thyroid health stays stable during any changes.
If you want ongoing updates on thyroid health news and practical solutions, you can:
- Subscribe to my email newsletter
- Follow me on Instagram / YouTube for breaking updates
- Schedule a consultation to review your personal options
Disclaimer: This article is for educational purposes only and is not medical advice. Always consult your healthcare provider before making changes to your medication.
Normal labs don’t always mean optimal function.
If you still feel tired, foggy, inflamed, moody, or stuck with weight gain despite being told everything looks fine, your symptoms deserve a deeper look.