Dr. Nicole Saphier, President-elect Donald Trump's nominee for surgeon general, sells dietary supplements that contain ingredients banned by the U.S. military over health concerns, according to product listings and regulatory information.

The herbal supplement sold by Saphier includes components that health experts have warned may cause liver damage. The U.S. military has prohibited service members from using products containing these ingredients due to potential health risks.

Amazon has opened an inquiry into the product's compliance following questions about the ingredients. The online retailer is reviewing whether the supplements meet platform standards for health and safety.

Dietary supplements face limited regulatory oversight in the United States compared to prescription medications. Some doctors and consumer advocates have expressed concerns about the marketing of such products, particularly when promoted by medical professionals.

The White House has defended the nomination, stating that Saphier will be a valuable addition to the administration's health agenda. Trump announced her selection as part of his broader health team appointments.

Saphier's background in supplement sales has drawn scrutiny from medical professionals who question the appropriateness of the nation's top doctor being involved in the largely unregulated supplement industry.