Editorial Standards
Sources & Methodology
Weight Loss Rankings is an independent editorial site. Every statistical claim, pricing figure, and clinical reference on this site traces back to a primary source listed here. We do not cite secondary summaries when a primary source is available.
Our pricing data is collected directly from telehealth provider websites and updated continuously. Manufacturer list prices (Wegovy, Ozempic, Zepbound, Mounjaro) are pulled from official patient assistance program pages. Clinical data comes exclusively from peer-reviewed trials published in indexed journals.
For a full explanation of how we score and rank providers, see our Methodology page. For affiliate and commercial disclosure, see our Disclosure page.
Clinical Trials
Peer-reviewed randomized controlled trials and outcome studies published in indexed medical journals.
New England Journal of Medicine
PubMed: 38785288
The Lancet
PubMed: 19216158
The Lancet
PubMed: 37364588
New England Journal of Medicine
PubMed: 26132939
New England Journal of Medicine
PubMed: 37952131 · DOI: 10.1056/NEJMoa2307563
New England Journal of Medicine
PubMed: 33567185 · DOI: 10.1056/NEJMoa2032183
The Lancet
PubMed: 33667417
JAMA
PubMed: 33625476
JAMA
PubMed: 33755728
Nature Medicine
PubMed: 36216945
JAMA
PubMed: 35015037
New England Journal of Medicine
PubMed: 35323065
New England Journal of Medicine
PubMed: 37622681
New England Journal of Medicine
PubMed: 35658024 · DOI: 10.1056/NEJMoa2206038
The Lancet
PubMed: 37356449
Nature Medicine
PubMed: 38334595
JAMA
PubMed: 38078870
New England Journal of Medicine
PubMed: 40334173 · DOI: 10.1056/NEJMoa2413944
The Lancet
PubMed: 34186022
New England Journal of Medicine
PubMed: 34170647 · DOI: 10.1056/NEJMoa2107519
The Lancet
PubMed: 34370970
The Lancet
PubMed: 34508103
New England Journal of Medicine
PubMed: 27633186
Regulatory & FDA
U.S. Food and Drug Administration guidance documents, warning letters, drug shortage listings, and compounding regulations.
Centers for Medicare & Medicaid Services
Centers for Medicare & Medicaid Services
Centers for Medicare & Medicaid Services
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
U.S. Food & Drug Administration
Internal Revenue Service
Accreditation Commission for Health Care (ACHC) / PCAB
U.S. Department of Labor, Employee Benefits Security Administration
United States Pharmacopeia
United States Pharmacopeia
United States Pharmacopeia
Statistics & Epidemiology
Government and non-profit epidemiological datasets covering obesity prevalence, Medicaid coverage, and health insurance policy.
Centers for Disease Control and Prevention
Centers for Disease Control and Prevention
Centers for Disease Control and Prevention / NCHS
Kaiser Family Foundation
Kaiser Family Foundation
Kaiser Family Foundation
Kaiser Family Foundation
National Institute of Diabetes and Digestive and Kidney Diseases
Weight Loss Rankings
World Health Organization
Pricing & Cost Data
Manufacturer-published list prices, patient-assistance program rates, and our own independently collected provider pricing dataset.
GoodRx Holdings
Eli Lilly and Company
Eli Lilly and Company (LillyDirect)
Eli Lilly and Company (LillyDirect)
Novo Nordisk (NovoCare)
Novo Nordisk (NovoCare)
Novo Nordisk (NovoCare)
WeightLossRankings.org
Clinical Guidelines
Professional society and regulatory treatment guidelines that inform our editorial standards.
American Heart Association / American College of Cardiology / The Obesity Society
PubMed: 24222017
American Association of Clinical Endocrinology
PubMed: 27219496
American Diabetes Association
The Endocrine Society
The Obesity Society
U.S. Preventive Services Task Force
Reporting a broken link or outdated source? Please contact us and we will verify and update the registry within 5 business days. Source URLs are re-verified by the editorial team monthly.