New Study Shows Natural Thyroid is Better

Hypothroidism-Before-and-After-Thyroid-PillsNew Study Shows Natural Thyroid Better than Synthetic

by Jeffrey Dach MD

Left image: Man with Hypothyroidism. Left Panel  is before treatment, and Right Panel is after treatment with natural thyroid pills NDT natural desiccated thyroid Photos taken from and courtesy of Mark Starr MD’s book, entitled  Hypothyroidism Type 2: The Epidemic.

This article is part three of a series. 
For part one  Click Here
For part Two, Click Here
For Part Three Click Here

American Thyroid Association (ATA) Guidelines

Natural Thyroid has been used successfully for more than 100 years (3), and it is blatantly obvious to any experienced clinician that natural desiccated thyroid is superior to T4-only medications such as Synthroid and Levothyroxine.  However, in spite its obvious clinical superiority, Endocrinology Societies such as the ATA have published guidelines advising doctors to stay away from natural thyroid. (1)   Over the years, they have used a variety of reasons.  The latest reason is that there are no controlled trials .  Here is the quote from the ATA Guidelines:

As of 2012 there are no controlled trials supporting the preferred use of desiccated thyroid hormone over synthetic L-thyroxine in the treatment of hypothyroidism or any other thyroid disease.”(1)

A New Controlled Trial Comparing Natural Thyroid to Synthroid

Pig Natural Desiccated Thyroid Naturethroid RLC LabsThis has changed, as a new controlled trial was just published in the May 2013 Journal of Endocrinology by endocrinologists at the Walter Reed National Military Medical Center in Bethesda, Maryland  (2)

Left image: natural thyroid comes from a pig thyroid gland.
Switching OVER to Synthroid

When a new patient comes into the Walter Reed Medical Center on natural thyroid, they are immediately switched over to Synthroid (or T4- only meds).

Occasionally DID NOT Feel As Well

The authors’ usual practice is to switch any new patient over from natural thyroid to Synthroid (T4-only levothyroxine).  However, the doctors noted that after doing Technesium 99M Radionuclide Scan of Throid Glandthis:

“Patients on natural thyroid (desiccated thyroid extract ,DTE), after being switched over to levothyroxine (l-T4), occasionally did not feel as well , (despite adequate dosing based on serum TSH levels.) “(2).

This is exactly what I have found in actual clinical practice over the years.  Patients feel much better on natural thyroid.  We use exclusively Nature-throid from RLC labs with good results.

Left Image: radionuclide scan of thyroid gland.

Comparing Synthroid to Natural Thyroid

Their controlled study compared natural thyroid with Synthroid.  What they found was that roughly half of the patients (48%) felt better on the natural thyroid, one third had no preference, and one fifth (18.6%) felt better on the Synthroid.  Clearly  the natural thyroid wins the comparison test (48.6% vs. 18.6%).

Ultrasound Image of Thyroid GLand“At the end of the study, 34 patients (48.6%) preferred Dessicated (Natural Thyroid), 13 (18.6%) preferred Levothyroxine (T4), and 23 (32.9%) had no preference.”(2)

Left image: Ultrasound image of thyroid gland.

Now that we have a controlled trial showing the natural thyroid is better, maybe the ATA should change its guideline? 

Update 2014:   New study shows that T4-only Levothyroxine cannot guarantee normal thyroid function in all patients, even with a TSH in the “normal range”. Quote: More than 20% of these patients, despite normal TSH levels, do not maintain FT3 or FT4 values in the reference range, reflecting the inadequacy of peripheral deiodination to compensate for the absent T3 secretion.”  See:
Gullo, Damiano et al. “Levothyroxine Monotherapy Cannot Guarantee Euthyroidism in All Athyreotic Patients.” Ed. Marian Ludgate. PLoS ONE 6.8 (2011): e22552. PMC. Web. 23 Dec. 2014.

Update 2015:

These two studies from Dr ANtonio Blanco at Rush University Medical Center ,explain that polymorphisms (genetic variations) in the Deiodinase enzyme gene explain why levothyroxine (T4 only meds) don’t work in some patients:

1) See: de Castro, Joao Pedro Werneck, et al. “Differences in hypothalamic type 2 deiodinase ubiquitination explain localized sensitivity to thyroxine.” The Journal of clinical investigation 125.125 (2) (2015): 0-0.  quote:“normalization of serum TSH with L-T4 monotherapy results in relatively low serum 3,5,3′-triiodothyronine (T3) and high serum thyroxine/T3 (T4/T3) ratio”

2) McAninch, Elizabeth A., et al. “Prevalent Polymorphism in Thyroid Hormone-Activating Enzyme Leaves a Genetic Fingerprint that Underlies Associated Clinical Syndromes.” The Journal of Clinical Endocrinology & Metabolism (2015).

3)  Higher doses of levothyroxine (which suppress TSH) are needed for adequate treatment.

See: Ito, Mitsuru, et al. “TSH-suppressive doses of levothyroxine are required to achieve preoperative native serum triiodothyronine levels in patients who have undergone total thyroidectomy.” European Journal of Endocrinology 167.3 (2012): 373-378.

This article has three parts:  For part one click here: Why Natural Thyroid is Better Than Synthetic
For part Two, Click Here
For Part Three Click Here.

Articles with Related Interest:

TSH Suppression Benefits and Adverse Effects

TSH Wars Part One

TSH Wars Part Two

Author: Jeffrey Dach MD

Finanical Dislosure: The author, jeffrey dach md,  receives no compensation from RLC labs nor from any other thyroid medication manufacturer.

Links and References:

1) ATA_AACE_Guidelines_Hypothyroidism_2012_natural_thyroid
Garber, Jeffrey R., et al. “Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association.” Endocrine Practice 18.6 (2012): 988-1028.

“Thus, there are no controlled trials supporting the preferred use of desiccated thyroid hormone over synthetic L-thyroxine in the treatment of hypothyroidism or any other thyroid disease.”


J Clin Endocrinol Metab. 2013 May;98(5):1982-90.ENDOCRINE CARE ,
Desiccated Thyroid Extract Compared With Levothyroxine in the Treatment of Hypothyroidism: A Randomized, Double-Blind, Crossover Study
Thanh D. Hoang, Cara H. Olsen, Vinh Q. Mai, Patrick W. Clyde and Mohamed K. M. Shakir – Author Affiliations Department of Endocrinology (T.D.H., V.Q.M., P.W.C., M.K.M.S.), Walter Reed National Military Medical Center, Bethesda, Maryland 20889; and Department of Preventive Medicine and Biometrics (C.H.O.), Uniformed Services University of Health Sciences, Bethesda, Maryland 20814

Context: Patients previously treated with desiccated thyroid extract (DTE), when being switched to levothyroxine (L-T4), occasionally did not feel as well despite adequate dosing based on serum TSH levels.

Objective: Our objective was to investigate the effectiveness of DTE compared with L-T4 in hypothyroid patients.

Design and Setting: We conducted a randomized, double-blind, crossover study at a tertiary care center.

Patients: Patients (n = 70, age 18–65 years) diagnosed with primary hypothyroidism on a stable dose of L-T4 for 6 months were included in the study.

Intervention: Patients were randomized to either DTE or L-T4 for 16 weeks and then crossed over for the same duration.

Outcome Measures: Biochemical and neurocognitive tests at baseline and at the end of each treatment period were evaluated.

Results: There were no differences in symptoms and neurocognitive measurements between the 2 therapies. Patients lost 3 lb on DTE treatment (172.9 ± 36.4 lb vs 175.7 ± 37.7 lb, P < .001).

At the end of the study, 34 patients (48.6%) preferred DTE, 13 (18.6%) preferred L-T4, and 23 (32.9%) had no preference. In the subgroup analyses, those patients who preferred DTE lost 4 lb during the DTE treatment, and their subjective symptoms were significantly better while taking DTE as measured by the general health questionnaire-12 and thyroid symptom questionnaire (P < .001 for both). Five variables were predictors of preference for DTE.

Conclusion: DTE therapy did not result in a significant improvement in quality of life; however, DTE caused modest weight loss and nearly half (48.6%) of the study patients expressed preference for DTE over L-T4. DTE therapy may be relevant for some hypothyroid patients.

J R Soc Med March 1, 2011 vol. 104 no. 3 100-106
The discovery of thyroid replacement therapy. Part 3: A complete transformation   Stefan Slater   Edinburgh EH4 6PD, UK
The idea of thyroid replacement therapy

4) The Best Clinical Guidelines Money Can Buy: A Look at Guidelines Bias and Thyroid Treatment by Holtorf Medical Group


Author: Jeffrey Dach MD
7450 Griffin Road, Suite 190
Davie, Fl 33314

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