Investigating the effectiveness of combined T4 and T3 therapy for hypothyroidism

T4/T3 Therapy in Hypothyroidism

NIH-funded research University of Pennsylvania · NIH-11075334

This study is looking into how a combination of two thyroid hormones, LT4 and LT3, might help people with hypothyroidism feel better, especially since some still have symptoms even while taking the usual treatment.

Quick facts

Grant typeR01 grant
Study typeNIH-funded research
Funding institutionUniversity of Pennsylvania NIH-funded
Lab location1 site (Philadelphia, United States)
Project IDNIH-11075334 on NIH RePORTER

What this research studies

This research focuses on hypothyroidism, a condition requiring lifelong thyroid hormone replacement. The standard treatment, Levothyroxine (LT4), does not fully mimic natural thyroid function, which includes both T4 and T3 hormones. Many patients continue to experience symptoms despite LT4 treatment. This study aims to gather data to design a clinical trial that will evaluate the effectiveness of a combination therapy using both LT4 and T3 (LT3) to improve patient outcomes.

Who could benefit from this research

Good fit: Ideal candidates for this research are individuals diagnosed with hypothyroidism who are currently on Levothyroxine but still experience symptoms.

Not a fit: Patients who have not been diagnosed with hypothyroidism or those who are already receiving effective treatment without residual symptoms may not benefit from this research.

Why it matters

Potential benefit: If successful, this research could lead to more effective treatment options for patients with hypothyroidism, potentially alleviating persistent symptoms.

How similar studies have performed: Previous research has indicated that combination therapy approaches may improve outcomes for patients with thyroid disorders, suggesting potential success for this study.

Where this research is happening

Philadelphia, United States

Researchers

About this research

  1. This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
  2. Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
  3. For full project details, budget, and progress reports, visit the official NIH RePORTER page below.
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.