GLPwatch
Transdermal "Natural GLP-1" Dietary Supplements Violate Law and Place Patients at Risk.
Ann Pharmacother · 2026
Last updated 2026-05-28Twenty-five transdermal products marketed as "natural GLP-1" supplements were found to be illegal because U.S. law requires dietary supplements to be taken by mouth, not applied as patches or gels. These products contained an average of 7 ingredients each, such as berberine and cinnamon, but none provided proof of their contents, and many used misleading claims in their advertising.
AI summary of the abstract below.
| Journal | Ann Pharmacother, 2026 |
|---|---|
| Citations | 0 |
| Molecules | — |
| Conditions studied | Type 2 Diabetes, Obesity |
Abstract
Consumers precluded from obtaining semaglutide or tirzepatide by clinicians or insurers are turning to natural "GLP-1" transdermal patches. The Dietary Supplement Health and Education Act specifies dietary supplement products must be swallowed, so all these products are illegal. We identified 24 transdermal patch dietary supplement products and 1 transdermal gel product with an average of 7 ± 4 natural ingredients (berberine, glutamine/glutamate, cinnamon, and pomegranate most listed). No certificates of analysis were posted, many products lacked the Food and Drug Administration disclaimer, and many products used deceptive advertising. Several products had 1- to 2-star reviews and consumer comments suggesting lack of efficacy or adverse events.
Verbatim abstract via PubMed 41480958 ↗