THE SOURCE REGISTER
Trace the statement.
A source is a place to check a claim, not a seal of approval for an entire service. Each record shows its role and the articles that use it.
Prescription labeling
DailyMed: Synthroid levothyroxine sodium tablets, prescribing information revised February 2024 ↗
Checked 2026-09-27
Articles using this source
Prescription labeling
DailyMed: Tirosint levothyroxine sodium capsules, prescribing information revised October 2022; record updated March 2026 ↗
Checked 2026-09-27
Manufacturer information
Synthroid: official manufacturer website ↗
Checked 2026-09-27
Articles using this source
Manufacturer program terms
Synthroid: support and savings programs ↗
Checked 2026-09-27
Articles using this source
Manufacturer program terms
Synthroid Delivers: manufacturer program prices, eligibility and shipping terms ↗
Checked 2026-09-27
Manufacturer information
Tirosint: official manufacturer website ↗
Checked 2026-09-27
Articles using this source
Manufacturer information
Tirosint capsules: formulation and packaging ↗
Checked 2026-09-27
Articles using this source
Federal regulator
FDA: Generic Drug Facts ↗
Checked 2026-09-27
Articles using this source
- CoreAge Rx thyroid medication review: what the public record establishes
- Best thyroid medication offers to compare: service, product and pharmacy
- Synthroid levothyroxine review: label facts, brand claims and savings terms
- Tirosint levothyroxine capsule review: formulation, claims and access
- How to judge a thyroid medication review before trusting its conclusion
- What belongs in a thyroid treatment price quote?
Federal regulator research summary
FDA: retrospective levothyroxine generic-switching research summary ↗
Checked 2026-09-27
Federal regulator
FDA: current actions addressing unapproved thyroid medications ↗
Checked 2026-09-27
Articles using this source
Medical society patient guidance
American Thyroid Association: Thyroid Hormone Treatment ↗
Checked 2026-09-27
Articles using this source
Specialty society patient guidance
American Thyroid Association: Adult Hypothyroidism ↗
Checked 2026-09-27
Articles using this source
Official label revised April 2025
Pfizer: Cytomel liothyronine sodium prescribing information ↗
Checked 2026-09-27
Articles using this source
Federal health-information evaluation guidance
NCCIH: How Do You Know the Information Is Accurate? ↗
Checked 2026-09-27
Articles using this source
Federal guide to evaluating research claims
NCCIH: Checklist for Understanding Health News Stories ↗
Checked 2026-09-27
Articles using this source
Federal self-pay estimate guidance; modified August 25, 2026
CMS: Know Your Medical Bill Rights When Not Using Insurance ↗
Checked 2026-09-27
Articles using this source
Published consensus abstract; future trial design, not a new treatment trial
Jonklaas et al.: Evidence-Based Use of Levothyroxine/Liothyronine Combinations, 2021 consensus ↗
Checked 2026-09-27
Specialty society testing explanation
American Thyroid Association: Thyroid Function Tests ↗
Checked 2026-09-27
Federal itemized estimate guidance; modified August 25, 2026
CMS: What Is a Good Faith Health Insurance Estimate? ↗
Checked 2026-09-27